Next, when there is an objection (ex. a box) between 2 faces for which I want to calculate the view factor, I tried the following command, but an error occurred and the view factor could not be calculated.
I have tried that commands. As a result, the Radiance worked well.
However, this gives me the view factor due to rays hitting both the surface and the cube.
What I want to achieve is to get the view factor excluding the rays hitting the cube.
In other words, the cube is an obstacle, an object that should be excluded from the view factor.
(When doing Raytrace, I want to exclude rays that pass through the cube then hit the surface)
What would be the command in this case?
It worked, but I am thinking that the value will be smaller than when there is only the surface.
The cube should have a different material than the surface that you are calculating the view factor for. The -m material_wood flag in your command specifies that the view factor should be calculated for all the surfaces that share this material.