Finalize and unify the design of the 'Morph' and 'Blend' nodes (#3974)

* Fix Morph node transform interpolation and preservation in the table

* Fix click target positions for Morph's nested layers by pre-compensating upstream_data transforms

* Redesign Morph node (v3) with control path input and uniformly spaced progression, and fix Stroke::lerp interpolation weights

* Add migration from Morph node v2 to v3

* Redesign the 'Blend Shapes' node behavior and subgraph definition

* Add the Layer > Blend menu entry to easily set up a blend

* Optimize the Morph node

* Refactor the Morph node to remove the roundtrip through BezPath

* Fine-tune Morph node Bezier order promotion and handle interpolation

* Add the Layer > Morph menu bar entry

* Fix NaN and guard against other potential NaN bugs breaking the editor

* Add InterpolationDistribution parameter to Morph with weighted progression, swap parameter orders, and rename shear to skew

* Add the Reverse parameter to the Morph node

* Update the order of the inputs to Blend Shapes for consistency with Morph

* Make Layer > Morph create the Morph Path control layer

* Fix migrations

* Move 10 to a constant

* Avoid division by 0 in the Blend Shapes node internals

* Rename nodes 'Blend' -> 'Mix' and 'Blend Shapes' to 'Blend'

* Fix a crash encountered while testing

* Final code review

* Make domain push dupe checks debug-only and use push_unchecked in the Morph node

* Pre-allocate for pushes to the vector domains

* Add fast path at t=0

* Inline reserve()

* Set up the control path layer above not below, and starting collapsed

* Review fixes

---------

Co-authored-by: Timon <me@timon.zip>

editor/src/messages/portfolio/document/document_message.rs

@@ -84,6 +84,8 @@ pub enum DocumentMessage {
 	GridVisibility {
 		visible: bool,
 	},
+	BlendSelectedLayers,
+	MorphSelectedLayers,
 	GroupSelectedLayers {
 		group_folder_type: GroupFolderType,
 	},

editor/src/messages/portfolio/document/document_message_handler.rs

@@ -5,7 +5,8 @@ use super::utility_types::network_interface::{self, NodeNetworkInterface, Transa
 use super::utility_types::nodes::{CollapsedLayers, LayerStructureEntry, SelectedNodes};
 use crate::application::{GRAPHITE_GIT_COMMIT_HASH, generate_uuid};
 use crate::consts::{
-	ASYMPTOTIC_EFFECT, COLOR_OVERLAY_GRAY, DEFAULT_DOCUMENT_NAME, FILE_EXTENSION, LAYER_INDENT_OFFSET, NODE_CHAIN_WIDTH, SCALE_EFFECT, SCROLLBAR_SPACING, VIEWPORT_ROTATE_SNAP_INTERVAL,
+	ASYMPTOTIC_EFFECT, BLEND_COUNT_PER_LAYER, COLOR_OVERLAY_GRAY, DEFAULT_DOCUMENT_NAME, FILE_EXTENSION, LAYER_INDENT_OFFSET, NODE_CHAIN_WIDTH, SCALE_EFFECT, SCROLLBAR_SPACING,
+	VIEWPORT_ROTATE_SNAP_INTERVAL,
 };
 use crate::messages::input_mapper::utility_types::macros::action_shortcut;
 use crate::messages::layout::utility_types::widget_prelude::*;
@@ -625,6 +626,12 @@ impl MessageHandler<DocumentMessage, DocumentMessageContext<'_>> for DocumentMes
 				self.snapping_state.grid_snapping = visible;
 				responses.add(OverlaysMessage::Draw);
 			}
+			DocumentMessage::BlendSelectedLayers => {
+				self.handle_group_selected_layers(GroupFolderType::Blend, responses);
+			}
+			DocumentMessage::MorphSelectedLayers => {
+				self.handle_group_selected_layers(GroupFolderType::Morph, responses);
+			}
 			DocumentMessage::GroupSelectedLayers { group_folder_type } => {
 				self.handle_group_selected_layers(group_folder_type, responses);
 			}
@@ -1485,6 +1492,8 @@ impl MessageHandler<DocumentMessage, DocumentMessageContext<'_>> for DocumentMes
 				DeleteSelectedLayers,
 				DuplicateSelectedLayers,
 				GroupSelectedLayers,
+				BlendSelectedLayers,
+				MorphSelectedLayers,
 				SelectedLayersLower,
 				SelectedLayersLowerToBack,
 				SelectedLayersRaise,
@@ -2160,6 +2169,57 @@ impl DocumentMessageHandler {
 					});
 				}
 			}
+			GroupFolderType::Blend | GroupFolderType::Morph => {
+				let control_path_id = NodeId(generate_uuid());
+				let all_layers_to_group = network_interface.shallowest_unique_layers_sorted(&[]);
+				let blend_count = matches!(group_folder_type, GroupFolderType::Blend).then(|| all_layers_to_group.len() * BLEND_COUNT_PER_LAYER);
+
+				responses.add(GraphOperationMessage::NewInterpolationLayer {
+					id: folder_id,
+					control_path_id,
+					parent,
+					insert_index,
+					blend_count,
+				});
+
+				let new_group_folder = LayerNodeIdentifier::new_unchecked(folder_id);
+
+				// Move selected layers into the group as children
+				for layer_to_group in all_layers_to_group.into_iter().rev() {
+					responses.add(NodeGraphMessage::MoveLayerToStack {
+						layer: layer_to_group,
+						parent: new_group_folder,
+						insert_index: 0,
+					});
+				}
+
+				// Connect the child stack to the control path layer as a co-parent
+				responses.add(GraphOperationMessage::ConnectInterpolationControlPathToChildren {
+					interpolation_layer_id: folder_id,
+					control_path_id,
+				});
+
+				responses.add(NodeGraphMessage::SelectedNodesSet { nodes: vec![folder_id] });
+				responses.add(NodeGraphMessage::RunDocumentGraph);
+				responses.add(DocumentMessage::DocumentStructureChanged);
+				responses.add(NodeGraphMessage::SendGraph);
+
+				// The control path layer (Blend Path / Morph Path) should start collapsed.
+				let instance_path = {
+					// Build instance path from root down to the control path layer, which is a sibling of the main layer under `parent`.
+					let mut instance_path: Vec<NodeId> = parent
+						.ancestors(network_interface.document_metadata())
+						.take_while(|&ancestor| ancestor != LayerNodeIdentifier::ROOT_PARENT)
+						.map(LayerNodeIdentifier::to_node)
+						.collect();
+					instance_path.reverse();
+					instance_path.push(control_path_id);
+					instance_path
+				};
+				responses.add(DocumentMessage::ToggleLayerExpansion { instance_path, recursive: false });
+
+				return folder_id;
+			}
 		}
 
 		let new_group_folder = LayerNodeIdentifier::new_unchecked(folder_id);

editor/src/messages/portfolio/document/graph_operation/graph_operation_message.rs

@@ -74,6 +74,17 @@ pub enum GraphOperationMessage {
 		parent: LayerNodeIdentifier,
 		insert_index: usize,
 	},
+	NewInterpolationLayer {
+		id: NodeId,
+		control_path_id: NodeId,
+		parent: LayerNodeIdentifier,
+		insert_index: usize,
+		blend_count: Option<usize>,
+	},
+	ConnectInterpolationControlPathToChildren {
+		interpolation_layer_id: NodeId,
+		control_path_id: NodeId,
+	},
 	NewBooleanOperationLayer {
 		id: NodeId,
 		operation: graphene_std::vector::misc::BooleanOperation,

editor/src/messages/portfolio/document/graph_operation/graph_operation_message_handler.rs

@@ -172,6 +172,77 @@ impl MessageHandler<GraphOperationMessage, GraphOperationMessageContext<'_>> for
 				network_interface.move_layer_to_stack(layer, parent, insert_index, &[]);
 				responses.add(NodeGraphMessage::RunDocumentGraph);
 			}
+			GraphOperationMessage::NewInterpolationLayer {
+				id,
+				control_path_id,
+				parent,
+				insert_index,
+				blend_count,
+			} => {
+				let mut modify_inputs = ModifyInputsContext::new(network_interface, responses);
+				let layer = modify_inputs.create_layer(id);
+
+				// Insert the main chain node (Blend or Morph) depending on whether a blend count is provided
+				let (chain_node_id, layer_alias, path_alias) = if let Some(count) = blend_count {
+					(modify_inputs.insert_blend_data(layer, count as f64), "Blend", "Blend Path")
+				} else {
+					(modify_inputs.insert_morph_data(layer), "Morph", "Morph Path")
+				};
+
+				// Create the control path layer (Path → Auto-Tangents → Origins to Polyline)
+				let control_path_layer = modify_inputs.create_layer(control_path_id);
+				let path_node_id = modify_inputs.insert_control_path_data(control_path_layer);
+
+				network_interface.move_layer_to_stack(control_path_layer, parent, insert_index, &[]);
+				network_interface.move_layer_to_stack(layer, parent, insert_index + 1, &[]);
+
+				// Connect the Path node's output to the chain node's path parameter input (input 4 for both Morph and Blend).
+				// Done after move_layer_to_stack so chain nodes have correct positions when converted to absolute.
+				network_interface.set_input(&InputConnector::node(chain_node_id, 4), NodeInput::node(path_node_id, 0), &[]);
+
+				responses.add(NodeGraphMessage::SetDisplayNameImpl {
+					node_id: id,
+					alias: layer_alias.to_string(),
+				});
+				responses.add(NodeGraphMessage::SetDisplayNameImpl {
+					node_id: control_path_id,
+					alias: path_alias.to_string(),
+				});
+			}
+			GraphOperationMessage::ConnectInterpolationControlPathToChildren {
+				interpolation_layer_id,
+				control_path_id,
+			} => {
+				// Find the chain node (Blend or Morph, first in chain of the layer)
+				let Some(OutputConnector::Node { node_id: chain_node, .. }) = network_interface.upstream_output_connector(&InputConnector::node(interpolation_layer_id, 1), &[]) else {
+					log::error!("Could not find chain node for layer {interpolation_layer_id}");
+					return;
+				};
+
+				// Get what feeds into the chain node's primary input (the children stack)
+				let Some(OutputConnector::Node { node_id: children_id, output_index }) = network_interface.upstream_output_connector(&InputConnector::node(chain_node, 0), &[]) else {
+					log::error!("Could not find children stack feeding chain node {chain_node}");
+					return;
+				};
+
+				// Find the deepest node in the control path layer's chain (Origins to Polyline)
+				let mut deepest_chain_node = None;
+				let mut current_connector = InputConnector::node(control_path_id, 1);
+				while let Some(OutputConnector::Node { node_id, .. }) = network_interface.upstream_output_connector(&current_connector, &[]) {
+					deepest_chain_node = Some(node_id);
+					current_connector = InputConnector::node(node_id, 0);
+				}
+
+				// Connect children to the deepest chain node's input 0 (or the layer's input 1 if no chain)
+				let target_connector = match deepest_chain_node {
+					Some(node_id) => InputConnector::node(node_id, 0),
+					None => InputConnector::node(control_path_id, 1),
+				};
+				network_interface.set_input(&target_connector, NodeInput::node(children_id, output_index), &[]);
+
+				// Shift the child stack (topmost child only, the rest follow) down 3 and left 10
+				network_interface.shift_node(&children_id, IVec2::new(-10, 3), &[]);
+			}
 			GraphOperationMessage::NewBooleanOperationLayer { id, operation, parent, insert_index } => {
 				let mut modify_inputs = ModifyInputsContext::new(network_interface, responses);
 				let layer = modify_inputs.create_layer(id);

editor/src/messages/portfolio/document/graph_operation/utility_types.rs

@@ -156,6 +156,61 @@ impl<'a> ModifyInputsContext<'a> {
 		self.network_interface.move_node_to_chain_start(&boolean_id, layer, &[], self.import);
 	}
 
+	pub fn insert_blend_data(&mut self, layer: LayerNodeIdentifier, count: f64) -> NodeId {
+		let blend = resolve_network_node_type("Blend").expect("Blend node does not exist").node_template_input_override([
+			Some(NodeInput::value(TaggedValue::Graphic(Default::default()), true)),
+			Some(NodeInput::value(TaggedValue::F64(count), false)),
+		]);
+
+		let blend_id = NodeId::new();
+		self.network_interface.insert_node(blend_id, blend, &[]);
+		self.network_interface.move_node_to_chain_start(&blend_id, layer, &[], self.import);
+
+		blend_id
+	}
+
+	pub fn insert_morph_data(&mut self, layer: LayerNodeIdentifier) -> NodeId {
+		let morph = resolve_proto_node_type(graphene_std::vector::morph::IDENTIFIER)
+			.expect("Morph node does not exist")
+			.node_template_input_override([
+				Some(NodeInput::value(TaggedValue::Graphic(Default::default()), true)),
+				Some(NodeInput::value(TaggedValue::F64(0.5), false)),
+			]);
+
+		let morph_id = NodeId::new();
+		self.network_interface.insert_node(morph_id, morph, &[]);
+		self.network_interface.move_node_to_chain_start(&morph_id, layer, &[], self.import);
+
+		morph_id
+	}
+
+	/// Returns the Path node ID (the node closest to the layer's merge node in the chain).
+	pub fn insert_control_path_data(&mut self, layer: LayerNodeIdentifier) -> NodeId {
+		// Add Origins to Polyline node first (will be pushed deepest in the chain)
+		let origins_to_polyline = resolve_network_node_type("Origins to Polyline")
+			.expect("Origins to Polyline node does not exist")
+			.default_node_template();
+		let origins_to_polyline_id = NodeId::new();
+		self.network_interface.insert_node(origins_to_polyline_id, origins_to_polyline, &[]);
+		self.network_interface.move_node_to_chain_start(&origins_to_polyline_id, layer, &[], self.import);
+
+		// Add Auto-Tangents node (between Origins to Polyline and Path), with spread=1 and preserve_existing=false
+		let auto_tangents = resolve_proto_node_type(graphene_std::vector::auto_tangents::IDENTIFIER)
+			.expect("Auto-Tangents node does not exist")
+			.node_template_input_override([None, Some(NodeInput::value(TaggedValue::F64(1.), false)), Some(NodeInput::value(TaggedValue::Bool(false), false))]);
+		let auto_tangents_id = NodeId::new();
+		self.network_interface.insert_node(auto_tangents_id, auto_tangents, &[]);
+		self.network_interface.move_node_to_chain_start(&auto_tangents_id, layer, &[], self.import);
+
+		// Add Path node to chain start (closest to the Merge node)
+		let path = resolve_network_node_type("Path").expect("Path node does not exist").default_node_template();
+		let path_id = NodeId::new();
+		self.network_interface.insert_node(path_id, path, &[]);
+		self.network_interface.move_node_to_chain_start(&path_id, layer, &[], self.import);
+
+		path_id
+	}
+
 	pub fn insert_vector(&mut self, subpaths: Vec<Subpath<PointId>>, layer: LayerNodeIdentifier, include_transform: bool, include_fill: bool, include_stroke: bool) {
 		let vector = Table::new_from_element(Vector::from_subpaths(subpaths, true));
 

editor/src/messages/portfolio/document/navigation/navigation_message_handler.rs

@@ -343,8 +343,8 @@ impl MessageHandler<NavigationMessage, NavigationMessageContext<'_>> for Navigat
 				let (pos1, pos2) = (pos1.min(pos2), pos1.max(pos2));
 				let diagonal = pos2 - pos1;
 
-				if diagonal.length() < f64::EPSILON * 1000. || viewport.size().into_dvec2() == DVec2::ZERO {
-					warn!("Cannot center since the viewport size is 0");
+				if !diagonal.is_finite() || diagonal.length() < f64::EPSILON * 1000. || viewport.size().into_dvec2() == DVec2::ZERO {
+					warn!("Cannot center since the viewport size is 0 or the bounds are non-finite");
 					return;
 				}
 

editor/src/messages/portfolio/document/node_graph/document_node_definitions.rs

@@ -462,184 +462,131 @@ fn document_node_definitions() -> HashMap<DefinitionIdentifier, DocumentNodeDefi
 			properties: None,
 		},
 		DocumentNodeDefinition {
-			identifier: "Blend Shapes",
+			identifier: "Blend",
 			category: "Vector",
-			// [IMPORTS]2 -> 0[0:Floor]
-			// [0:Floor]0 -> 0[1:Subtract]
-			// "1: f64" -> 1[1:Subtract]
-			// "(): ()" -> 0[2:Read Index]
-			// "0: u32" -> 1[2:Read Index]
-			// [2:Read Index]0 -> 0[3:Divide]
-			// [1:Subtract]0 -> 1[3:Divide]
-			// [IMPORTS]1 -> 0[4:Position on Path]
-			// [3:Divide]0 -> 1[4:Position on Path]
-			// "false: bool" -> 2[4:Position on Path]
-			// "false: bool" -> 3[4:Position on Path]
-			// "(): ()" -> 0[5:Read Vector]
-			// [5:Read Vector]0 -> 0[6:Reset Transform]
-			// "true: bool" -> 1[6:Reset Transform]
-			// "false: bool" -> 2[6:Reset Transform]
-			// "false: bool" -> 3[6:Reset Transform]
-			// [12:Flatten Vector]0 -> 0[7:Map]
-			// [6:Reset Transform]0 -> 1[7:Map]
-			// [7:Map]0 -> 0[8:Morph]
-			// [15:Multiply]0 -> 1[8:Morph]
-			// [8:Morph]0 -> 0[9:Transform]
-			// [4:Position on Path]0 -> 1[9:Transform]
-			// "0: f64" -> 2[9:Transform]
-			// "(0, 0): DVec2" -> 3[9:Transform]
-			// "(0, 0): DVec2" -> 4[9:Transform]
-			// [IMPORTS]1 -> 0[10:Count Points]
-			// [10:Count Points]0 -> 0[11:Equals]
-			// [13:Count Elements]0 -> 1[11:Equals]
-			// [IMPORTS]0 -> 0[12:Flatten Vector]
-			// [12:Flatten Vector]0 -> 0[13:Count Elements]
-			// [13:Count Elements]0 -> 0[14:Subtract]
-			// "1: f64" -> 1[14:Subtract]
-			// [3:Divide]0 -> 0[15:Multiply]
-			// [14:Subtract]0 -> 1[15:Multiply]
-			// [12:Flatten Vector]0 -> 0[16:Morph]
-			// [15:Multiply]0 -> 1[16:Morph]
-			// [11:Equals]0 -> 0[17:Switch]
-			// [9:Transform]0 -> 1[17:Switch]
-			// [16:Morph]0 -> 2[17:Switch]
-			// [17:Switch]0 -> 0[18:Repeat]
-			// [0:Floor]0 -> 1[18:Repeat]
-			// [IMPORTS]3 -> 2[18:Repeat]
-			// [18:Repeat]0 -> 0[EXPORTS]
 			node_template: NodeTemplate {
 				document_node: DocumentNode {
 					implementation: DocumentNodeImplementation::Network(NodeNetwork {
-						exports: vec![NodeInput::node(NodeId(18), 0)],
+						exports: vec![NodeInput::node(NodeId(16), 0)],
 						nodes: [
-							// 0: Floor
+							// 0: Separate Subpaths (split path into individual subpaths)
+							DocumentNode {
+								implementation: DocumentNodeImplementation::ProtoNode(vector::separate_subpaths::IDENTIFIER),
+								inputs: vec![NodeInput::import(generic!(T), 4)],
+								..Default::default()
+							},
+							// 1: Count Elements (number of subpaths)
+							DocumentNode {
+								implementation: DocumentNodeImplementation::ProtoNode(vector::count_elements::IDENTIFIER),
+								inputs: vec![NodeInput::node(NodeId(0), 0)],
+								..Default::default()
+							},
+							// 2: Max (clamp subpath count to at least 1 for empty path case)
+							DocumentNode {
+								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::max::IDENTIFIER),
+								inputs: vec![NodeInput::node(NodeId(1), 0), NodeInput::value(TaggedValue::F64(1.), false)],
+								..Default::default()
+							},
+							// 3: Floor (integer count per subpath)
 							DocumentNode {
 								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::floor::IDENTIFIER),
-								inputs: vec![NodeInput::import(concrete!(f64), 2)],
+								inputs: vec![NodeInput::import(concrete!(f64), 1)],
 								..Default::default()
 							},
-							// 1: Subtract
+							// 4: Multiply (total_instances = count × subpath_count)
+							DocumentNode {
+								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::multiply::IDENTIFIER),
+								inputs: vec![NodeInput::node(NodeId(17), 0), NodeInput::node(NodeId(2), 0)],
+								..Default::default()
+							},
+							// 5: Subtract (count - 1, open subpath denominator)
 							DocumentNode {
 								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::subtract::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(0), 0), NodeInput::value(TaggedValue::F64(1.), false)],
+								inputs: vec![NodeInput::node(NodeId(17), 0), NodeInput::value(TaggedValue::F64(1.), false)],
 								..Default::default()
 							},
-							// 2: Read Index
+							// 6: Read Index (current repetition index)
 							DocumentNode {
 								implementation: DocumentNodeImplementation::ProtoNode(context::read_index::IDENTIFIER),
 								inputs: vec![NodeInput::value(TaggedValue::None, false), NodeInput::value(TaggedValue::U32(0), false)],
 								..Default::default()
 							},
-							// 3: Divide
+							// 7: Divide (index / count)
 							DocumentNode {
 								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::divide::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(2), 0), NodeInput::node(NodeId(1), 0)],
+								inputs: vec![NodeInput::node(NodeId(6), 0), NodeInput::node(NodeId(17), 0)],
 								..Default::default()
 							},
-							// 4: Position on Path
+							// 8: Floor (floor(index / count) = subpath index)
 							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(vector_nodes::position_on_path::IDENTIFIER),
-								inputs: vec![
-									NodeInput::import(generic!(T), 1),
-									NodeInput::node(NodeId(3), 0),
-									NodeInput::value(TaggedValue::Bool(false), false),
-									NodeInput::value(TaggedValue::Bool(false), false),
-								],
+								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::floor::IDENTIFIER),
+								inputs: vec![NodeInput::node(NodeId(7), 0)],
 								..Default::default()
 							},
-							// 5: Read Vector
+							// 9: Modulo (index % count = local index within subpath)
 							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(context::read_vector::IDENTIFIER),
-								inputs: vec![NodeInput::value(TaggedValue::None, false)],
+								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::modulo::IDENTIFIER),
+								inputs: vec![NodeInput::node(NodeId(6), 0), NodeInput::node(NodeId(17), 0), NodeInput::value(TaggedValue::Bool(true), false)],
 								..Default::default()
 							},
-							// 6: Reset Transform
+							// 10: Path Is Closed (check if current subpath is closed)
 							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(transform_nodes::reset_transform::IDENTIFIER),
-								inputs: vec![
-									NodeInput::node(NodeId(5), 0),
-									NodeInput::value(TaggedValue::Bool(true), false),
-									NodeInput::value(TaggedValue::Bool(false), false),
-									NodeInput::value(TaggedValue::Bool(false), false),
-								],
+								implementation: DocumentNodeImplementation::ProtoNode(vector::path_is_closed::IDENTIFIER),
+								inputs: vec![NodeInput::import(generic!(T), 4), NodeInput::node(NodeId(8), 0)],
 								..Default::default()
 							},
-							// 7: Map
-							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(graphic::map::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(12), 0), NodeInput::node(NodeId(6), 0)],
-								..Default::default()
-							},
-							// 8: Morph
-							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(vector::morph::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(7), 0), NodeInput::node(NodeId(15), 0)],
-								..Default::default()
-							},
-							// 9: Transform
-							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(transform_nodes::transform::IDENTIFIER),
-								inputs: vec![
-									NodeInput::node(NodeId(8), 0),
-									NodeInput::node(NodeId(4), 0),
-									NodeInput::value(TaggedValue::F64(0.), false),
-									NodeInput::value(TaggedValue::DVec2(DVec2::ONE), false),
-									NodeInput::value(TaggedValue::DVec2(DVec2::ZERO), false),
-								],
-								..Default::default()
-							},
-							// 10: Count Points
-							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(vector_nodes::count_points::IDENTIFIER),
-								inputs: vec![NodeInput::import(generic!(T), 1)],
-								..Default::default()
-							},
-							// 11: Equals
-							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::equals::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(10), 0), NodeInput::node(NodeId(13), 0)],
-								..Default::default()
-							},
-							// 12: Flatten Vector
-							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(graphic_nodes::graphic::flatten_vector::IDENTIFIER),
-								inputs: vec![NodeInput::import(generic!(T), 0)],
-								..Default::default()
-							},
-							// 13: Count Elements
-							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(vector::count_elements::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(12), 0)],
-								..Default::default()
-							},
-							// 14: Subtract
-							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::subtract::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(13), 0), NodeInput::value(TaggedValue::F64(1.), false)],
-								..Default::default()
-							},
-							// 15: Multiply
-							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::multiply::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(3), 0), NodeInput::node(NodeId(14), 0)],
-								..Default::default()
-							},
-							// 16: Morph
-							DocumentNode {
-								implementation: DocumentNodeImplementation::ProtoNode(vector::morph::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(12), 0), NodeInput::node(NodeId(15), 0)],
-								..Default::default()
-							},
-							// 17: Switch
+							// 11: Switch (closed → count, open → max(count - 1, 1) as denominator)
 							DocumentNode {
 								implementation: DocumentNodeImplementation::ProtoNode(logic::switch::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(11), 0), NodeInput::node(NodeId(9), 0), NodeInput::node(NodeId(16), 0)],
+								inputs: vec![NodeInput::node(NodeId(10), 0), NodeInput::node(NodeId(17), 0), NodeInput::node(NodeId(18), 0)],
 								..Default::default()
 							},
-							// 18: Repeat
+							// 12: Divide (local_index / denominator = within-subpath fraction)
+							DocumentNode {
+								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::divide::IDENTIFIER),
+								inputs: vec![NodeInput::node(NodeId(9), 0), NodeInput::node(NodeId(11), 0)],
+								..Default::default()
+							},
+							// 13: Multiply (fraction × 0.9999999999 to avoid overflowing to the next subpath)
+							DocumentNode {
+								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::multiply::IDENTIFIER),
+								inputs: vec![NodeInput::node(NodeId(12), 0), NodeInput::value(TaggedValue::F64(0.9999999999), false)],
+								..Default::default()
+							},
+							// 14: Add (subpath_index + clamped fraction = progression)
+							DocumentNode {
+								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::add::IDENTIFIER),
+								inputs: vec![NodeInput::node(NodeId(8), 0), NodeInput::node(NodeId(13), 0)],
+								..Default::default()
+							},
+							// 15: Morph (content, progression, reverse, distribution, path)
+							DocumentNode {
+								implementation: DocumentNodeImplementation::ProtoNode(vector::morph::IDENTIFIER),
+								inputs: vec![
+									NodeInput::import(generic!(T), 0),
+									NodeInput::node(NodeId(14), 0),
+									NodeInput::value(TaggedValue::Bool(false), false),
+									NodeInput::import(concrete!(vector::misc::InterpolationDistribution), 3),
+									NodeInput::import(generic!(T), 4),
+								],
+								..Default::default()
+							},
+							// 16: Repeat
 							DocumentNode {
 								implementation: DocumentNodeImplementation::ProtoNode(repeat_nodes::repeat::IDENTIFIER),
-								inputs: vec![NodeInput::node(NodeId(17), 0), NodeInput::node(NodeId(0), 0), NodeInput::import(generic!(T), 3)],
+								inputs: vec![NodeInput::node(NodeId(15), 0), NodeInput::node(NodeId(4), 0), NodeInput::import(generic!(T), 2)],
+								..Default::default()
+							},
+							// 17: Max (clamp count to at least 1)
+							DocumentNode {
+								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::max::IDENTIFIER),
+								inputs: vec![NodeInput::node(NodeId(3), 0), NodeInput::value(TaggedValue::F64(1.), false)],
+								..Default::default()
+							},
+							// 18: Max (clamp open-path denominator to at least 1 to avoid division by zero when count = 1)
+							DocumentNode {
+								implementation: DocumentNodeImplementation::ProtoNode(math_nodes::max::IDENTIFIER),
+								inputs: vec![NodeInput::node(NodeId(5), 0), NodeInput::value(TaggedValue::F64(1.), false)],
 								..Default::default()
 							},
 						]
@@ -650,168 +597,175 @@ fn document_node_definitions() -> HashMap<DefinitionIdentifier, DocumentNodeDefi
 						..Default::default()
 					}),
 					inputs: vec![
-						NodeInput::value(TaggedValue::Vector(Default::default()), true),
 						NodeInput::value(TaggedValue::Vector(Default::default()), true),
 						NodeInput::value(TaggedValue::F64(10.), false),
 						NodeInput::value(TaggedValue::Bool(Default::default()), false),
+						NodeInput::value(TaggedValue::InterpolationDistribution(Default::default()), false),
+						NodeInput::value(TaggedValue::Vector(Default::default()), false),
 					],
 					..Default::default()
 				},
 				persistent_node_metadata: DocumentNodePersistentMetadata {
-					input_metadata: vec![("Content", "TODO").into(), ("Path", "TODO").into(), ("Count", "TODO").into(), ("Reverse", "TODO").into()],
+					input_metadata: vec![
+						("Content", "TODO").into(),
+						("Count", "TODO").into(),
+						("Reverse", "TODO").into(),
+						("Distribution", "TODO").into(),
+						("Path", "TODO").into(),
+					],
 					output_names: vec!["Out".to_string()],
 					node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(0, 0)),
 					network_metadata: Some(NodeNetworkMetadata {
 						persistent_metadata: NodeNetworkPersistentMetadata {
 							node_metadata: [
-								// 0: Floor
+								// 0: Separate Subpaths
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(0, 0)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(2, 0)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 1: Subtract
+								// 1: Count Elements
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(7, -1)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(2, 2)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 2: Read Index
+								// 2: Max (subpath count)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(7, -2)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(9, 2)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 3: Divide
+								// 3: Floor (count)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(14, -2)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(2, 13)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 4: Position on Path
+								// 4: Multiply (total instances)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(28, -3)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(16, 1)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 5: Read Vector
+								// 5: Subtract (count - 1)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(7, 2)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(16, 14)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 6: Reset Transform
+								// 6: Read Index
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(14, 2)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(2, 7)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 7: Map
+								// 7: Divide (index / count)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(21, 1)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(16, 10)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 8: Morph
+								// 8: Floor (subpath index)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(28, 1)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(23, 4)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 9: Transform
+								// 9: Modulo (local index)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(35, 1)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(16, 7)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 10: Count Points
+								// 10: Path Is Closed
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(7, 4)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(30, 2)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 11: Equals
+								// 11: Switch (denominator)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(14, 4)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(30, 12)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 12: Flatten Vector
+								// 12: Divide (within-subpath fraction)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(0, 6)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(23, 7)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 13: Count Elements
+								// 13: Multiply (clamp fraction)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(7, 8)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(30, 7)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 14: Subtract
+								// 14: Add (progression)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(14, 8)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(37, 4)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 15: Multiply
+								// 15: Morph
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(21, 7)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(44, 3)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 16: Morph
+								// 16: Repeat
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(28, 6)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(51, 0)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 17: Switch
+								// 17: Max (clamp count)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(42, 4)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(9, 13)),
 										..Default::default()
 									},
 									..Default::default()
 								},
-								// 18: Repeat
+								// 18: Max (clamp open-path denominator)
 								DocumentNodeMetadata {
 									persistent_metadata: DocumentNodePersistentMetadata {
-										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(49, -1)),
+										node_type_metadata: NodeTypePersistentMetadata::node(IVec2::new(23, 14)),
 										..Default::default()
 									},
 									..Default::default()
@@ -834,17 +788,6 @@ fn document_node_definitions() -> HashMap<DefinitionIdentifier, DocumentNodeDefi
 		DocumentNodeDefinition {
 			identifier: "Origins to Polyline",
 			category: "Vector",
-			// "(): ()" -> 0[0:Read Vector]
-			// [0:Read Vector]0 -> 0[1:Extract Transform]
-			// [1:Extract Transform]0 -> 0[2:Decompose Translation]
-			// [2:Decompose Translation]0 -> 0[3:Vec2 to Point]
-			// [IMPORTS]0 -> 0[4:Flatten Vector]
-			// [4:Flatten Vector]0 -> 0[5:Map]
-			// [3:Vec2 to Point]0 -> 1[5:Map]
-			// [5:Map]0 -> 0[6: Flatten Path]
-			// [6:Flatten Path]0 -> 0[7:Points to Polyline]
-			// "false: bool" -> 1[7:Points to Polyline]
-			// [7:Points to Polyline]0 -> 0[EXPORTS]
 			node_template: NodeTemplate {
 				document_node: DocumentNode {
 					implementation: DocumentNodeImplementation::Network(NodeNetwork {

editor/src/messages/portfolio/document/node_graph/node_properties.rs

@@ -26,7 +26,7 @@ use graphene_std::text::{Font, TextAlign};
 use graphene_std::transform::{Footprint, ReferencePoint, ScaleType, Transform};
 use graphene_std::vector::QRCodeErrorCorrectionLevel;
 use graphene_std::vector::misc::BooleanOperation;
-use graphene_std::vector::misc::{ArcType, CentroidType, ExtrudeJoiningAlgorithm, GridType, MergeByDistanceAlgorithm, PointSpacingType, RowsOrColumns, SpiralType};
+use graphene_std::vector::misc::{ArcType, CentroidType, ExtrudeJoiningAlgorithm, GridType, InterpolationDistribution, MergeByDistanceAlgorithm, PointSpacingType, RowsOrColumns, SpiralType};
 use graphene_std::vector::style::{Fill, FillChoice, FillType, GradientStops, GradientType, PaintOrder, StrokeAlign, StrokeCap, StrokeJoin};
 
 pub(crate) fn string_properties(text: &str) -> Vec<LayoutGroup> {
@@ -266,6 +266,7 @@ pub(crate) fn property_from_type(
 						Some(x) if x == TypeId::of::<LuminanceCalculation>() => enum_choice::<LuminanceCalculation>().for_socket(default_info).property_row(),
 						Some(x) if x == TypeId::of::<QRCodeErrorCorrectionLevel>() => enum_choice::<QRCodeErrorCorrectionLevel>().for_socket(default_info).property_row(),
 						Some(x) if x == TypeId::of::<ScaleType>() => enum_choice::<ScaleType>().for_socket(default_info).property_row(),
+						Some(x) if x == TypeId::of::<InterpolationDistribution>() => enum_choice::<InterpolationDistribution>().for_socket(default_info).property_row(),
 						// =====
 						// OTHER
 						// =====

editor/src/messages/portfolio/document/utility_types/misc.rs

@@ -1,5 +1,6 @@
 use crate::consts::COLOR_OVERLAY_GRAY;
 use glam::DVec2;
+use graphene_std::vector::misc::BooleanOperation;
 use std::fmt;
 
 #[repr(transparent)]
@@ -710,5 +711,7 @@ impl PTZ {
 #[derive(Clone, Copy, Debug, PartialEq, serde::Serialize, serde::Deserialize)]
 pub enum GroupFolderType {
 	Layer,
-	BooleanOperation(graphene_std::vector::misc::BooleanOperation),
+	BooleanOperation(BooleanOperation),
+	Blend,
+	Morph,
 }

editor/src/messages/portfolio/document/utility_types/network_interface.rs

@@ -1209,6 +1209,8 @@ impl NodeNetworkInterface {
 				}
 				self.document_metadata.bounding_box_document(layer)
 			})
+			// Skip any layer bounds containing NaN to avoid poisoning the combined result
+			.filter(|[min, max]| min.is_finite() && max.is_finite())
 			.reduce(Quad::combine_bounds)
 	}