Standard materials rendering 0,0,0 black

[davision]

For some reason, I have some old meshes merged into a scene where their standard materials are rendering as pure 0,0,0 black. I thought it was some errant matte setting in Vray -- but it's not. If I put a vray material on them they render fine.

Has anyone seen this problem before?

[Morbid Angel]

could be the usage of physical camera? standart mats are not designed to be used in LWF space.

[davision]

nope. Not a physical cam. it's very weird.

[Dynedain]

Materials with raytracing? Vray can't use max's raytrace materials or maps. You'd have to convert to vray materials, or use the vray map instead.

Also, most of Max/Viz "architectural" materials are actually raytraced materials under the fancy interface... so they won't work.

[davision]

Nope. There were some other raytraced materials in the scene (by accident) -- but the ones that were freaking out were just plain standard mats.

I just did the Vray Converter on the whole thing to fix it -- but I'm still a bit confused as to how it happened in the first place. I use standard materials frequently since they're on old meshes and I've never seen this error before.

[Morbid Angel]

messed up normals?

[davision]

I don't know. Would vray mats render right if normals were weird?

Maybe if I have time I'll try to upload a piece of the file later on.

[Morbid Angel]

technicly vray mat is double sided, so if the normal is flipped then it would still compute correctly, though that may affect reflections and displacement. But max mat as by default single sided, thus it will render insides = black.