Programming API Reference: EduGraf.OpenGLClass public abstract GlShadingAspect: IDisposableA shading can have multiple visual properties or aspects that can be defined separately.Property protected GlShading? Shading { get; set; }: the aspect belongs to.Method protected abstract void Apply()Apply this effect for the following actions.Method protected abstract void UnApply()Unapply this effect for the following actions.