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/latest/tutorials/shading/index.html Returns the current value set for this material of a uniform in the shader. Returns [code]true[/code] if the property identified by [code]name[/code] can be reverted to a default value. Returns the default value of the material property with given [code]name[/code]. Changes the value set for this material of a uniform in the shader. [b]Note:[/b] [code]param[/code] must match the name of the uniform in the code exactly. The [Shader] program used to render this material.