InstancedMeshGeometry3DNodeUseInstanceIdColor Property

When true (false by default) then the color of each instance is defined by the id (index) of each instance. The lowest 8 bits of the instance id number are written to the blue color, then to the green color, then to the red color and the highest byte (when more the 16M instances) is written to the alpha color (for example, instanceId = 1: RGB: 0x000001; instanceId 257: RGB: 0x000102).

public bool UseInstanceIdColor { get; set; }