public override void Render(Scene scene, System.Drawing.Rectangle clientRectangle, PickingGeometryType pickingGeometryType)
{
this.On();// limit rendering area.
vec4 color = this.ClearColor.ToVec4();
OpenGL.glClearColor(color.x, color.y, color.z, color.w);
OpenGL.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT | OpenGL.GL_STENCIL_BUFFER_BIT);
this.Off();// cancel limitation.
}
}