again ... Colored spots

[SylvainJ]

Hi,

Take a look at this image.



Can someone can tell me why I have these spots ??

I've search the forum for this and I've made a complete clean up of all the objects and textures:

No raytrace
Clamp active on all bitmaps
No white color at 255
all Vray textures

This problem appear only on some frames and sometime, we have the same plants somewhere else and they don't do that thing.

Specs:

Vray 1.47.03
IR Map + QMC

anyone can help me on this.

Note: I'l be out of the office for the weekend. Back on monday, I will try to find the problem with your hints.

Thanks

[joconnell]

It might be the cropping bug on some textures that you have in your scene - check the vray render dialog too and it should point you towards an object causing a problem.

[marco]

Looking at your image it appears to me that you're rendering to fields.
maybe the field rendering is causing these problems?

Marco

[Da_elf]

kinda funny. i hardly ever use cropping in max and ive never had any of the "cropped bitmaps" error. i thought vlado fixed that ages ago

[RErender]

actually I think discreet/autodesk fixed it in Max 7

[Da_elf]

ah. there ya go. know someone somewhere somehow fixed it. not if they can only fix the weird noise my fridge makes now and again ill be happy

[SylvainJ]

Looking at your image it appears to me that you're rendering to fields.
maybe the field rendering is causing these problems?

Marco

Ok I'm back. Like Marco said, the problem seem to came from the fields.

I will try to render a small part of the animation without fields to see
if the problem is gone.

I've forget to said that i'm with max 7.5.

By the way, the Vray dialog give no errors or warnings in the scene.

[SylvainJ]

Ok, I've render a small part of the animation with no fields and the spots still there.

The last thing I will try, I will replace the bitmaps on the plants to
see if the problem come from the bitmaps.

See you soon

[DaForce]

hmmm i would start by dropping a gray vray material on all the objects using the global material override or something. just to rule out a material problem or to prove its a material problem. do you use the color correctcorrect at all?

[jujubee]

I've had spots like that. Make sure you are using a vray material in that region. Also, this can be caused by a lack of UVW Maps applied.

[SylvainJ]

do you use the color correctcorrect at all?

yes

jujubee, I think you have a good point for the UVW's. I will check this out also. Thanks.

[Candelero]

Consider this also:

Check all materials (mainly the glass type) in the scene, if you are using any Falloff type maps in the Reflection/Refraction slots of the material (talking about VRayMtls), check on the overide IOR in the options of the Falloff map.
That was a problem with a scene, which created some serious spots, we have examined recently. Checking that tick fixed it.


Best regards,
nikki Candelero

[SylvainJ]

Finally found the problem.

These's plants came from an old library where they where created 5 years ago in Maya (before i was here, my boss was working with it) then they where imported into the max library and we keep the original UVW's that came with the object (using the obj importer in Max).

Putting a brand new UVW modifier on it remove all the spots.

We also notice this problem on some Tree Storm trees.

Finally, this problem is only visible when you use the Adaptive QMC anti-aliasing. Switching to the Adaptive subdivision resolve also the problem but the rendering time was doubled in that case and also, it use to much RAM. This is why I wanted to keep the Adaptive QMC.

Thanks everyone for your help.