I want to make a shape like a large S and then make it emissive in order to light a particular area in my model. But I don’t want the camera to see it - I want it to function like a light that I’ve checked the Invisible slot for. Is this possible in any way?
Maybe try the ‘only in secondary’ button in the materials options? I’ve never used this for an emissive material though, there’s a possibility it wont calculate the direct rays though (first bounce)?? Worth a try.
