A material that uses a custom [Shader] program. A material that uses a custom [Shader] program to render either items to screen or process particles. You can create multiple materials for the same shader but configure different values for the uniforms defined in the shader. http://docs.godotengine.org/en/3.1/tutorials/shading/index.html Returns the current value set for this material of a uniform in the shader. Changes the value set for this material of a uniform in the shader. The [Shader] program used to render this material.