Fix #14466

packages/dev/core/src/Meshes/Node/Blocks/Instances/instantiateOnFacesBlock.ts

@@ -5,7 +5,7 @@ import { NodeGeometryBlockConnectionPointTypes } from "../../Enums/nodeGeometryC
 import type { NodeGeometryBuildState } from "../../nodeGeometryBuildState";
 import type { INodeGeometryExecutionContext } from "../../Interfaces/nodeGeometryExecutionContext";
 import type { VertexData } from "../../../mesh.vertexData";
-import { Vector3 } from "../../../../Maths/math.vector";
+import { Vector2, Vector3 } from "../../../../Maths/math.vector";
 import { PropertyTypeForEdition, editableInPropertyPage } from "../../../../Decorators/nodeDecorator";
 import type { Nullable } from "../../../../types";
 import type { INodeGeometryInstancingContext } from "../../Interfaces/nodeGeometryInstancingContext";
@@ -18,11 +18,15 @@ export class InstantiateOnFacesBlock extends NodeGeometryBlock implements INodeG
     private _currentFaceIndex: number;
     private _currentLoopIndex: number;
     private _currentPosition = new Vector3();
+    private _currentUV = new Vector2();
     private _vertex0 = new Vector3();
     private _vertex1 = new Vector3();
     private _vertex2 = new Vector3();
     private _tempVector0 = new Vector3();
     private _tempVector1 = new Vector3();
+    private _uv0 = new Vector2();
+    private _uv1 = new Vector2();
+    private _uv2 = new Vector2();
 
     /**
      * Gets or sets a boolean indicating that this block can evaluate context
@@ -101,6 +105,14 @@ export class InstantiateOnFacesBlock extends NodeGeometryBlock implements INodeG
         return Vector3.Cross(this._tempVector1, this._tempVector0);
     }
 
+    /**
+     * Gets the value associated with a contextual UV1 se
+     * @returns the value associated with the source
+     */
+    public getOverrideUVs1ContextualValue() {
+        return this._currentUV;
+    }
+
     /**
      * Gets the current class name
      * @returns the class name
@@ -185,18 +197,28 @@ export class InstantiateOnFacesBlock extends NodeGeometryBlock implements INodeG
             this._currentLoopIndex = 0;
 
             for (this._currentFaceIndex = 0; this._currentFaceIndex < faceCount; this._currentFaceIndex++) {
-                // Extract face vertices
-                this._vertex0.fromArray(this._vertexData.positions, this._vertexData.indices[this._currentFaceIndex * 3] * 3);
-                this._vertex1.fromArray(this._vertexData.positions, this._vertexData.indices[this._currentFaceIndex * 3 + 1] * 3);
-                this._vertex2.fromArray(this._vertexData.positions, this._vertexData.indices[this._currentFaceIndex * 3 + 2] * 3);
-
                 accumulatedCount += instancePerFace;
                 const countPerFace = (accumulatedCount | 0) - totalDone;
 
                 if (countPerFace < 1) {
                     continue;
                 }
 
+                const faceID0 = this._vertexData.indices[this._currentFaceIndex * 3];
+                const faceID1 = this._vertexData.indices[this._currentFaceIndex * 3 + 1];
+                const faceID2 = this._vertexData.indices[this._currentFaceIndex * 3 + 2];
+
+                // Extract face vertices
+                this._vertex0.fromArray(this._vertexData.positions, faceID0 * 3);
+                this._vertex1.fromArray(this._vertexData.positions, faceID1 * 3);
+                this._vertex2.fromArray(this._vertexData.positions, faceID2 * 3);
+
+                if (this._vertexData.uvs) {
+                    this._uv0.fromArray(this._vertexData.uvs, faceID0 * 2);
+                    this._uv1.fromArray(this._vertexData.uvs, faceID1 * 2);
+                    this._uv2.fromArray(this._vertexData.uvs, faceID2 * 2);
+                }
+
                 for (let faceDispatchCount = 0; faceDispatchCount < countPerFace; faceDispatchCount++) {
                     if (totalDone >= instanceCount) {
                         break;
@@ -221,6 +243,10 @@ export class InstantiateOnFacesBlock extends NodeGeometryBlock implements INodeG
                         s * this._vertex0.z + t * this._vertex1.z + u * this._vertex2.z
                     );
 
+                    if (this._vertexData.uvs) {
+                        this._currentUV.set(s * this._uv0.x + t * this._uv1.x + u * this._uv2.x, s * this._uv0.y + t * this._uv1.y + u * this._uv2.y);
+                    }
+
                     // Clone the instance
                     instanceGeometry = this.instance.getConnectedValue(state) as VertexData;
 

packages/dev/core/src/Meshes/Node/Interfaces/nodeGeometryExecutionContext.ts

@@ -29,4 +29,10 @@ export interface INodeGeometryExecutionContext {
      * @returns the value associated with the source
      */
     getOverrideNormalsContextualValue?(): any;
+
+    /**
+     * Gets the value associated with a contextual UV1 set
+     * @returns the value associated with the source
+     */
+    getOverrideUVs1ContextualValue?(): any;
 }

packages/dev/core/src/Meshes/Node/nodeGeometryBuildState.ts

@@ -147,6 +147,9 @@ export class NodeGeometryBuildState {
                 }
                 return Vector4.FromArray(this.geometryContext.tangents as ArrayLike<number>, index * 4);
             case NodeGeometryContextualSources.UV:
+                if (this.executionContext.getOverrideUVs1ContextualValue) {
+                    return this.executionContext.getOverrideUVs1ContextualValue();
+                }
                 if (!this.geometryContext || !this.geometryContext.uvs) {
                     return Vector2.Zero();
                 }