Raytracing with STL Geometry

[CbsTau]

Hello,

I would like to view raytracing results of free surface water simulations, which includes the solid Geometry faces of the imported STL.

In the image below, you can see the boat in the water flow, but the STL seems to be drawn on top of the raytracing of the water. Also, any of the boundary surfaces (TYPE_S) are also shaded.

Two questions:

1. Can we remove / ignore the domain boundaries of TYPE_S in the rendering?
2. Can we include STL geometry in the raytracing?

Many thanks in advance!
Clinton.

This is what I would like to see, but in raytracing, so that you can see the water on both sides of the boat.

[JohnZhan2023]

So, have you solved the problem? I am struggling to render the TYPE_S boundaries transparent？