[jfrancis]

Not sure if I'm missing something but a nested dielectric 'ghost material' of transmittance 100% and Nd 1 doesn't take a bite out of objects with a higher priority but if I lower the transmittance to 99.99% it works

[jfrancis]

thanks
i played with th settings and i got the same results :
transmittance 1 0 0 or 0 1 0 or 0 0 1
Nd =1
Attenuation : 1m
roughness :0
Or :
transmittance 254 255 255 or 255 254 255 or 255 255 254
Nd =1
Attenuation : 999m
roughness :0
nested priority : 0
and for other materials (opaque ; metal ; transparent ..... ) : priority : 1
https://www.youtube.com/watch?v=2KNVUqWO3Bo

i tried boolean with a mesh but some triagles were visible

I was just reviewing another thread where seghier did some extensive testing and I notice now (missed it before) that he was using 254 in the transmittance (and a long attenuation distance)

http://www.maxwellrender.com/forum/view ... 28#p388130

[eric nixon]

I'm not sure if you've already found a solution, or what the question actually is,... anyway now you know that using a 'ghost' material to boolean is a no go.
But using 'air' works, bear in mind that air still casts a slight shadow, and hide to gi is not an option in this case. so making the boolean geo as small as possible is a good idea and maybe avoid very sharp lighting.

Maybe you can delete the other thread next to this one. (to honour the tidiness principal at least, even if the forum is FUBAR anyway)