face_off wrote:I am trying to use a reflection sphere big enough to fit the entire scene inside, so that I can get reflections right in the render. It works fine in MAX and Poser, but it turns the render black in Octane, probably because it's blocking all light from entering the scene. How can I set this up in Octane? I would appreciate any help on this.
There are a few ways to do this. If the sphere is mapped as per an environment map, simply light the scene from the map (ie. use the reflection map from the sphere in the "texture" pin of the "texture environment" on the Settings Tab of the plug (and make the sphere invisible in the Poser scene).
The other way you can do it is to use the sphere as it is, and also plug the spheres reflection map into the opacity (and might have to invert it first, ie. make black = white and white=black - not sure). So where there are bright reflections on the sphere, it will not be transparent, and where there are weak or no reflections, the sphere will be transparent and let the scene lighting in.
Thanks Paul, I will try them up. Another thing I want to do with the sphere is to use it as a backdrop for the scene. Environment lighting images usually get too large in the render to serve the purpose, and I don't know how scale it down and position it where I need it. With the sphere, I could scale it to any size, except that no light can go through it in Octane. If I use the sphere as an emitter, the map will get too bright (probably turn all white), and it won't serve as a backdrop anymore. It would be great if we could exclude the sphere from the lighting, so that I could position/scale it at will without blocking/affecting the actual lighting.