Black Faces

[BBullo]

I have a model that has some complicated crown molding at the ceiling. The geometry is intersecting other peices of geometry ceating those awful blace co-planar faces (only in some random areas). Isn't there a way to have Vray ignore the co-planar faces and have it render the correct material as long as both object share the same material?

[instinct]

doubler faces can be conquered by slightly rising the "secondary ray bias" value in your global switches

Thorsten

[dlparisi]

and by "slightly", he means around .01 or .02. It doesn't take much.

Whoops! CORRECTION...meant to say ".001 or .002", see comments below

[BBullo]

Ahh..... thanks

[DaForce]

Fix your damn model

[BBullo]

Oh yea DaForce, why didn't I think of that one?

I was looking for the lazy, I mean EASY fix.

[Da_elf]

DaForce said it best.

[DaForce]

There was motive behind my bluntness.

Basically once you start raising the secondary ray bias you risk the chance of having other problems... blotches... etc..
Some people have had this happen. Plus it may make things render a bit slower (just guessing)

[R2J2]

There was motive behind my bluntness.

Basically once you start raising the secondary ray bias you risk the chance of having other problems... blotches... etc..
Some people have had this happen. Plus it may make things render a bit slower (just guessing)

nice, any more info on what it would affect?

I have to admit that if I get a 3d model from a client & quick turnaround (arr, witch ones arn't?) I would go to like .001 just to be shore.
I've found on a numberof jobs that I would get slightly quicker render time but of course my understanding of what the secondary rays are doing is limited.

[DaForce]

mmmm I am having troubles finding info to substantiate my claims...

At higher levels it can produce light leaks... and i thgouth other render problems as well. But cant find any of the threads im looking for... basically if you use it keep it as low as possible 0.001 and slowly creep up until your coplanar face problem goes away.

[timmatron]

mmmm I am having troubles finding info to substantiate my claims...

At higher levels it can produce light leaks...

It's true. I had that happen in a big way on an interior I was doing once. I think I had it set to .001 and forgot about it, but then I was getting some really bizarre shadows, and couldn't figure it out until I set it back to 0. So unfortunately, it's not a cure all, but works good in a pinch.

[DaForce]

THanks for the clarification

Damnit why dont we have a thiumbs up smiley (that one is from cgtalk)

[3ddesign]

Fix your damn model

He would if his client would give him time to fix it. I know. I'm his client. So other than the obvious "fix it" a little more constructive help would seem to be in order.

Bret, I'm cuious to know if raising the secondary bias helped. I'm struggling with a similar condition that Josh modeled for me.

Craig

[DaForce]

ahhh....oooookk

He already had a resolution, i was just being cheeky, he.. and everyone else knew it. (why didnt you catch on)
And you will also notice that a little further down I gave him some info about using the secondary rays bias and that he should be careful about using it, now correct me if im wrong but that was constructive wasnt it.

And i realise he didnt have time to re-model it , otherwise he would have already done that. (pretty obvious)

So get off your high horse, and come down here with the rest of us

[BBullo]

I knew you were only joking Daforce.
I was curious however about the concequences of raising the secondary ray bias. That was later explained.
The funny thing is, before I got to trying the setting, the ceiling design completly changed, allowing me to "fix my damn model! "
So Craig, I haven't had a chance to try the setting, but its nice to have this in my back pocket for future refrence. i'll let you know if I use it down the road.