advanced rendering for AutoCAD
In VRAY rendered, generally we want to make invisible auxiliary light to help illuminate the scene. I do not know whether this NXTRENDER general, or that according to real-life light source to set up, without the need to set up a so-called secondary light source it?
for outdoor scenes, or for individual items, our studio lighting option creates great, subtle, lighting by filtering sun and sky light through a forest.
For indoor scenes you will need actual lights.
However, one thing you can do is to place an invisible, rectangular, or area light below the ceiling.