Computing the outgoing ray direction through a medium like glass

[asprasan]

I have done the following

1. Generate primary camera rays using mi.Ray3f function by specifying a single camera origin and multiple directions (following tutorial on scripting a renderer)
2. Create a scene using mi.Scene consisting of two glass slabs placed at two different locations on z-axis parallel to x-y plane (following the tutorial on caustics optimization)
3. Using ray_intersect, I have computed the intersection of the primary camera rays with the scene. At the output, I get a SurfaceInteraction3f instance containing the information like uv coordinates, sh_frame, wi, etc.

Question: How do I compute the outgoing ray directions after the primary camera rays have traversed through the glass slab? That is, how do I obtain wo from the bsdf assigned to the object.

[Speierers]

You will need to use the BSDF::sample() function for this, which will give you a new direction according to the BSDF assigned to the glass slabs.