private Texture InitFace2DTexture(int width, int height)
{
if (this.backface2DTexture != null) { this.backface2DTexture.Dispose(); }
var texture = new Texture(
TextureTarget.Texture2D,
new NullImageFiller(width, height, OpenGL.GL_RGBA16F, OpenGL.GL_RGBA, OpenGL.GL_FLOAT),
new SamplerParameters(TextureWrapping.Repeat, TextureWrapping.Repeat, TextureWrapping.Repeat, TextureFilter.Nearest, TextureFilter.Nearest));
texture.Initialize();
return texture;
}