| siBlendInTextureLayers |
[0] Blend the new shaders in with any existing shaders on the ports, or the parameter value if there are no shaders. |
| siReplaceAndBlendInTextureLayers |
[1] Remove any existing shaders and layers from the parameters, and blend with the parameter value. |
| siReplaceAndNoBlendInTextureLayers |
[2] Remove any existing shaders and layers and connect the new shaders directly to the parameters, without blending. |