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What the hell Mental ray
show user profile  3joez
I've tried almost everything. Detached geometry, cloned geometry, new geometry, new scene merging... I've got a simple plane with a texture. I bake it. MR says: a ray encountered an invalid color (NaN) using black instead.

And a black spot appears at the center of the baked texture. Unbelievable.

read 737 times
10/26/2014 6:16:58 PM (last edit: 10/26/2014 6:16:58 PM)
show user profile  Mr_Stabby
am i the only one for whom photobucket images never work?

no clue about that problem of yours btw.

read 723 times
10/26/2014 8:14:48 PM (last edit: 10/26/2014 8:14:48 PM)
show user profile  Nik Clark
Can you post the material it's part of?

read 719 times
10/26/2014 8:52:14 PM (last edit: 10/26/2014 8:52:14 PM)
show user profile  mike_renouf
Random stab in the dark (no pun intended Stabby) maybe you've got some kind of problem related to Mr photographic exposure control? I came across various nasties some time ago when looking at compositing workflow with mentalray. One of which was that some of the render elements don't support photographic exposure.

read 698 times
10/26/2014 11:17:20 PM (last edit: 10/26/2014 11:17:20 PM)
show user profile  Garp
If by 'texture' you mean 'bitmap', the image file has an invalid number in it. A NaN is a floating point number that is incorrectly formed and cannot be used for computation.

read 686 times
10/27/2014 4:34:28 AM (last edit: 10/27/2014 4:50:21 AM)
show user profile  3joez
I suspect Garp is on the right track. I'll test and come back. Meanwhile, let me ask: where did that number came from? If the texture shows correctly, wouldn't that mean that the data(which is forming my bitmap) is not corrupted?
read 678 times
10/27/2014 9:05:56 AM (last edit: 10/27/2014 9:05:56 AM)
show user profile  Garp
I guess that would depend on how a particular renderer handles invalid values. MR replaces the color with black, but they could just as well average the faulty color channel with those of the neighboring pixels.
Or it could be that their diagnostic message is wrong and the problem has nothing to do with a NaN.

You could try to change the value by painting over the area in Photoshop and see what MR says.

Or you could reverse-engineer the file format and search the numeric values for a bit pattern that matches a NaN as defined by the IEEE 754 Standard. You know, be creative :P

read 674 times
10/27/2014 10:16:57 AM (last edit: 10/27/2014 10:18:20 AM)
show user profile  reeves1984
Yeah, I would try resaving the image you're using as a texture

Simon Reeves - VFX Artist & Blog
twitter <-- I work here

read 668 times
10/27/2014 10:56:38 AM (last edit: 10/27/2014 10:56:38 AM)
show user profile  3joez
I was almost hoping that the texture was the problem. The image is changed and the problem remains.

read 653 times
10/27/2014 1:44:43 PM (last edit: 10/27/2014 1:44:43 PM)
show user profile  Garp
Well, if it's not the texture, it means that the NaN is produced during some phase of the computation. Good luck with that!

read 647 times
10/27/2014 3:15:11 PM (last edit: 10/27/2014 3:15:11 PM)
show user profile  3joez
Holy cow.
read 640 times
10/27/2014 3:35:05 PM (last edit: 10/27/2014 3:35:05 PM)
show user profile  Pim4
I've seen nan messages before, in mental ray, where I had an empty bitmap slot (bitmap slot with no bitmap assigned) or a vray shader assigned. Maybe something like that?

read 622 times
10/27/2014 7:44:35 PM (last edit: 10/27/2014 7:44:35 PM)
show user profile  3joez
No empty slots, no vray materials around.I've found this Default Contrast shader, DefaultContour shader and DefaultContourOutput shader in the scene materials with the slate editor. What the hell is that? I'm starting to think the scale of my scene is too big. The plane I'm trying to bake from is 10000 unit long and 6000 wide. I've also tried rescaling and guess what: bake is completely white. AAAAAhhhh Autodesk. I'm running out of possibilities, anyway.
read 613 times
10/27/2014 9:52:34 PM (last edit: 10/27/2014 9:52:34 PM)
show user profile  3joez
Just for the record. The black hole goes away when scaling manually a little bit. These are the tools for ninjas.
read 577 times
10/29/2014 12:14:46 PM (last edit: 10/29/2014 12:15:10 PM)
show user profile  reeves1984
scalling what?

Simon Reeves - VFX Artist & Blog
twitter <-- I work here

read 567 times
10/29/2014 2:13:47 PM (last edit: 10/29/2014 2:13:47 PM)
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