Switch Shop And Shader Sop Confusion

[RickWork]

Hello,

I'm trying to understand how to use the Switch SHOPs as well as Shader SOP for different renderers. I'm pretty lost here.

For the Switch SHOP, I can have different shaders wired in and based on the renderpass variable it will choose the right one? So I take it I have to have a pre-render script to setenv RENDERPASS a value correct? Is this the practical workflow?

Taking this a bit further, the Shader SOP has an option for renderers. I tried setting a vex super material for Mantra, and vex constant for OpenGL. I did this all in 1 shader sop. As you can guess this doesn't work. So I appended another Shader SOP to the chain.

Shader Sop1 has the renderer set to mantra with a vex super material (yellow color).

Shader Sop2 has the renderer set to opengl with a vex constant (blue color) material.

If I render with mantra I see the vex super material.

If I render with the opengl rop, I see the vex super material?

So in this case, I think my workflow is wrong....

Any clarification you could offer would be appreciated.

I attached a simple hip file with my setup in regards to the Shader Sop.

Cheers

ShaderSOP_aa.hip.gz