virtual void transform(int) = 0;
		virtual void draw(int) = 0;
		virtual void zShaderParameters() = 0;
		virtual void shaderParameters(const ngVector3*, float, float) = 0;
		virtual void zShader2Parameters() = 0;
		virtual void render_afterTransform(const ngVector3*, const ngVector3*) = 0;
		virtual void zRender_afterTransform() = 0;
		virtual void zRender2_afterTransform() = 0;