DirectionalLightShaderResetRenderableGeometryMaterialFlagsValue Method

When RenderableGeometry objects are rendered in the same order in each frame, the RenderableGeometry.MaterialFlags value specifies how similar the material is to the previous object (for example if diffuse part is the same, then many color checks can be skipped). But when the order of rendering is changed or if we start rendering from the middle of the RenderingQueue, then we need to reset the cached value for the first rendered RenderableGeometry so that all the checks are done agine. This method does that.

public void ResetRenderableGeometryMaterialFlagsValue()