I'm rather new to Blender, and try to learn it to make physics animations and visualise my data. However, I have difficulties getting the refraction working. I hope I am doing something stupid wrong, but after googling and trying for a few days, I hope the community can help me.
What I want to do is shine a 'laser' (spot light) through a cube that is rotating. Depending on the angle, the spot should move. The steps I took are: - remove the default cube - change to Cycles render (although I tried it also with internal) - add a plane and scale it. - add a cube, add material, set surface to glass BSDF, set surface to 'Is Transmission Ray' - add a spotlight, increase the strength to 50000, size 1d, blend 0 - at the render preferences, set the Samples to 2000 - rotate the cube, insert some key frames, and reder it.
The result is that the majority of the light goes straight through the cube, while a minimal amount seems to be refracted (the noisy white dots??). See the figure below. The red dot is not moving when the cube is rotating, while the white dots are.
The .blend file is available here: https://www.dropbox.com/s/3g8v6bp5s7plx85/test.blend?dl=0
I hope somebody can help me. Thanks for any help!
Thanks already for all the comments. With the Luxrenderer I could make it work, so that is at least a working option.
It still would be good to get it working in Cycles and understand it. There seems to be some discrepancy in the answers whether or not this is possible. A working example might work wonders.
The 'Is Transmission Ray' was tried as I read it somewhere (not the best argument) It didn't change the result one way or the other. The same holds for different values of the IOR.