InstancedMeshGeometry3DNodeIsPreMultipliedAlphaColor Property

When IsPreMultipliedAlphaColor is true (false by default) and Alpha is less then 1, then the instance colors components are already multiplied with alpha value to produce pre-multiplied colors. When false, then non-pre-multiplied color is converted in pre-multiplied color when this is required by the shader.

public bool IsPreMultipliedAlphaColor { get; set; }