Add support for PointCloud

Author: martinRenou

src/MeshBlock.ts

@@ -91,3 +91,45 @@ class TetraMesh extends PolyMesh {
   tetrahedronIndices: Uint32Array;
 
 }
+
+
+/**
+ * PointCloud class
+ */
+export
+class PointCloud extends Block {
+
+  constructor (vertices: Float32Array, data: Data[], options?: BlockOptions) {
+    super(vertices, data, options);
+
+    this.geometry = new THREE.BufferGeometry();
+
+    const vertexBuffer = new THREE.BufferAttribute(vertices, 3);
+
+    this.geometry.setAttribute('position', vertexBuffer);
+
+    this.mesh = new NodeMesh(THREE.Points, this.geometry, this.data);
+    this.meshes.push(this.mesh);
+
+    this.buildMaterial();
+  }
+
+  /**
+   * Update vertices buffers
+   */
+  handleVerticesChange () {
+    super.handleVerticesChange();
+
+    this.mesh.vertices = this.vertices;
+  }
+
+  get boundingSphere () : THREE.Sphere {
+    this.geometry.computeBoundingSphere();
+    return this.geometry.boundingSphere;
+  }
+
+  geometry: THREE.BufferGeometry;
+
+  mesh: NodeMesh;
+
+}

src/NodeMesh.ts

@@ -16,7 +16,7 @@ enum NodeOperation {
 }
 
 export
-type MeshConstructor = new (geometry: THREE.BufferGeometry, material: Nodes.StandardNodeMaterial) => THREE.Mesh;
+type MeshConstructor = new (geometry: THREE.BufferGeometry, material: Nodes.StandardNodeMaterial) => THREE.Object3D;
 
 export
 type NodeOperationResult<T extends Nodes.Node> = T | Nodes.OperatorNode;
@@ -145,6 +145,12 @@ class NodeMesh {
     // @ts-ignore
     this.material.color = color;
 
+    // Workaround for https://github.com/mrdoob/three.js/issues/18152
+    if (this.mesh.type == 'Points') {
+      // @ts-ignore
+      this.material.normal = new Nodes.Vector3Node(1, 1, 1);
+    }
+
     this.material.alphaTest = 0.1;
 
     this.material.build();
@@ -285,8 +291,8 @@ class NodeMesh {
   }
 
   geometry: THREE.BufferGeometry;
-  material: Nodes.StandardNodeMaterial;
-  mesh: THREE.Mesh;
+  material: Nodes.NodeMaterial;
+  mesh: THREE.Object3D;
   readonly data: Data[];
 
   private meshCtor: MeshConstructor;