In case of problems with previous links (unavailability of sourceforge), use the one attached.

Maybe I'm too harsh, I really like that you put effort into the rendering engine. Kudos for that! [B-)] Don't get me wrong. But the future could be to switch to a better engine? Like from Blender perhaps.

I really like Sweet Home 3D actually, but the render engine should get replaced by a more modern engine using GPU.