Mental Ray Light Leaks

[Peterhus]

I have rendered an animation and I have some horrible light leaks going on.

 

As can you can see in the image below, one frame has cast shadow and the next has light shown through and this is flickering through out the animation.

 

[ATTACH=CONFIG]45609[/ATTACH]

 

I'm rendering using Final Gather and saving the pre-cal (one file per frame) and then render (Read FG Points Only). I'm using the skylight & target direct light with Ray Trace shadows. I have even ticked 2 Slided Shadows.

 

Not sure where to go from here, any ideas?

 

Thanks,

Peter

[datacrasher]

peter

Your using too many lights that's why your getting the bleed through are you using any bounces in your scene? sometimes if you also have to many bonces this can lead to a bleed through as well. so i would delete a couple of lights the one which are not very important in your scene...... and knock down the bounces!

 

Tony

[Justin Hunt]

What happen if you turn OFF Backface Cull in the red shader? It looks like a flipped face???

 

jhv

[Dave Buckley]

peter

Your using too many lights that's why your getting the bleed through are you using any bounces in your scene? sometimes if you also have to many bonces this can lead to a bleed through as well. so i would delete a couple of lights the one which are not very important in your scene...... and knock down the bounces!

 

Tony

 

he is only using 2 lights?

[datacrasher]

he is using 2 different lights from my understanding you should not be using the skylight in conjunction with the target direct light because the skylight is only meant for the scanline render and the Radiosity and the light-tracer. maybe i'm wrong i dunno on the old max's you could not do that but i am only using max 9 maybe they have updated the lighting

Edited November 7, 2011 by datacrasher

[Justin Hunt]

Nothing wrong with using Sky light with a Target direct, sure its old school but still works.

 

Skylight works well when doing soft "overcast" lighting, or you dont want too much colour variation like you do with mrsky.

 

jhv

[marius e]

Not to many light, thats for sure. Have you tried to manually flip the face. Other wise, delete those faces, and just remodel the problem area. You will have to recalculate everytime you make any changes though.

[Dave Buckley]

and if all else fails - 'Force 2-sided materials'?

[Peterhus]

I'm only using 2 bouncers. 1 isn't enough and 3 looks brighter so I do that in post-production.

 

I have check the Backface Cull and I have no flipped face.

 

I'm using ProMaterial even though I'm using 3ds Max Design 2011, something I have brought over from 2010. There no option to tick 'Force 2-sided materials' and looking at A&D Material I can't see that option too?

 

Justin Hunt is right, Sky light with a Target direct is old school but I like the clean look than MR Sun/Sky system that I get too much colour bleed. Suppose is this a better system to use then I will have to learn a bit more about it?

 

I did a animation before and it seem to be happening where I only have a thin box/plate, as you can see in my images I have a box/plate on top and bottom and box in the middle and a thin box/stiffener that fit in-between the top/bottom plate. Any where else seem to be fine in the animation.

 

Any ides?

Edited November 8, 2011 by Peterhus
spelling

[Dave Buckley]

Force 2-sided materials is in the Render Setup not the material settings