RBD Material Fracture Distorts UV's [SOLVED]

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Hello guys,

I'm a bit stumped by this. Basically I have a piece of stained glass that I'm fracturing by throwing a brick through it. I'm using a UVTexture node with a Perpective from Camera to create my UV's.

Unfortunately while everything looks fine when the glass is pre-fractured, the moment I instance the RBDMaterialFracture node to create my glass fractures, my UV's (and image) become distorted.

I can't figure out how to get my projected image to look correct….any ideas?
Edited by Midphase - July 30, 2020 20:06:07

Attachments:
SOTS_SHOT_1_v3_3Delight1_0001.jpg (1006.9 KB)
SOTS_SHOT_1_v3_3Delight1_0001 2.jpg (1007.0 KB)
RBD_UVs.hiplc (1.2 MB)

>>Kays
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https://www.youtube.com/c/RightBrainedTutorials [www.youtube.com]
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Hey,
Just out of curiosity why not to project UVs after the pieces are fractured?
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Because then this happens:

Attachments:
RBD_UVs_3Delight1_0001.jpg (1.1 MB)

>>Kays
For my Houdini tutorials and more visit:
https://www.youtube.com/c/RightBrainedTutorials [www.youtube.com]
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The UVs are fine. Just unpack the high-res geo, and you can see they are present and correct.
It could be an issue of packed geo not being unpacked during render correctly maybe.
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I just tested in Mantra and I get the same distorted results. I don't think this is a 3Delight bug.
>>Kays
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what's wrong with it?

seems okay for me, accounting for the fact that perspective projections will be distorted due to their non-linearity.

Attachments:
fracturedproject.hip (290.9 KB)

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Ok, thanks to TinyHawkus' help I think the issue is solved.

Basically the two things that made a difference were to use a PolygonMesh for my stained glass geometry as opposed to a simply Polygon, and then place the UVTexture node immediately after the RBDMaterialFracture.

This yields an 100% match to the footage plate.

Thanks everyone!!!

For those curious, here's what my final node tree looks like:

Attachments:
Screen Shot 2020-07-30 at 4.40.55 PM.png (104.8 KB)

>>Kays
For my Houdini tutorials and more visit:
https://www.youtube.com/c/RightBrainedTutorials [www.youtube.com]
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