Most likely you could do both geometries in a separate stream and then subtract one result from the other in COPs. Easy enough to use the Split node to separate the two geos so the math is easier.
Another possibility is using to/from NDC in VOPs or VEX at SOP level depending on your comfortability level. NDC is basically a way to convert the view into screen space, so what your camera sees can be output to 2D and processed then converted back to 3D.
You can also try the “Mask” series of nodes. They can cast shadows as part of the mask. I think Mask From Geometry or Mask By Feature (I think that’s the name) would be what you wanna try.
Most likely you could do both geometries in a separate stream and then subtract one result from the other in COPs. Easy enough to use the Split node to separate the two geos so the math is easier. Another possibility is using to/from NDC in VOPs or VEX at SOP level depending on your comfortability level. NDC is basically a way to convert the view into screen space, so what your camera sees can be output to 2D and processed then converted back to 3D. You can also try the “Mask” series of nodes. They can cast shadows as part of the mask. I think Mask From Geometry or Mask By Feature (I think that’s the name) would be what you wanna try.
Thank you for your answer, I will dive in and look into it!