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just want to check if this is user error on my part or not , but I cant get this to work on this build.

Could you show and example or share a scene which fails?

Sorry for the very late reply Tom .... busy elsewhere... I did solve my issue at the time . It was due to using full trans 255 white trying to do a boolean lowering the colour value solved it and got it working.

Why is that ?

i see this has been discussed here as well

http://www.maxwellrender.com/forum/view ... it=boolean

Oh, OK! Because "ghost" (nd=1 & trans=255) is a special case for the engine. It's perfect vacuum which is excluded from computations like refraction etc. Therefore, you can set it 254 and then expect it behave like a dielectric again

I used
nd = 1.00001 or 1.001
transmittance rgb 255
attenuation 999m
Roughness 0
and it work fine

How did you do that hatching?

i added new layer with procedural checker (hatch ) and masked it with checker ( half black/half white ) with plane mapping
than i scaled the mapping and moved it a little bit to got this result

in this case i added two layers for hatch ; i don't know why hatching appeared only in half of the model

seghier wrote: i don't know why hatching appeared only in half of the model

Sounds like magic.

tom wrote:

seghier wrote: i don't know why hatching appeared only in half of the model

Sounds like magic.

there is alot of magic in studio