Ok, I tried path tracing with GPU and bidirectional+MLT (only supported on CPU), and it seems that the GPU variant converges faster.

Thanks for the replies.

Update: I found a bug in my material properties: the absorption value should be 0, not 1. Also, I have removed the <absorption_layer> section in the material. Now, some light rays from the interiour of the sphere hit the camera, after 10mins of rendering, I have the following image: simpleScene_objS...

Hi, I am wondering what I am doing wrong when trying to render a solid glass sphere with Indigo. My goal is to model a plane intersecting the sphere. However, the part of the plane which is in the inner of the sphere is not visible, it seems that no light ray refracts at the sphere surface, reflects...