Color the faces of Three.js objects using the vertex colors provided

I am working with a mesh and have assigned vertex colors using the following code:

var vertColors = MyPolygonProto.polygons[iBorderCounter].polyMesh.geometry.colors;
vertColors[vertCount] = new THREE.Color(finalColor.r, finalColor.g, finalColor.b);

The polyMesh mentioned here is a mesh. My goal is to modify the colors of the faces based on their geometries.

I managed to follow the method described in this post: How to change face color in Three.js

However, it feels inefficient to iterate over the same vertices multiple times when they are shared by multiple faces. It would be more efficient if each face automatically extrapolated its color based on the colors of its vertices stored in the mesh.geometry.colors array.

Is there a feature in Three.js that allows for this kind of automatic interpolation?

javascriptopengl-escolorsthree.js

Answer №1

The three.js documentation states that vertex colors cannot be utilized in this manner. Instead, per-face vertex colors must be employed.

Here is an excerpt from the documentation regarding vertex colors:

An array of vertex colors must match the number and order of vertices. These colors are used in PointCloud and Line objects, while Meshes utilize per-face vertex colors embedded directly in faces. To indicate an update in this array, Geometry.colorsNeedUpdate must be set to true.

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