Layer RGBA - Arnold for Houdini

The layer_rgba shader can be used to linearly layer up to eight shaders together, enabling you to create complex shading effects. Layers are applied in order (bottom to top) according to a blending mode specified in the operation. The layer alpha can optionally be a separate input. A use for this shader could include adding text to an image for example.

_{Example of layer_rgba shader used to layer Arnold graffiti texture onto brick texture}