UVW Randomization

[mckenzie2VER2]

Is there a native way of doing this other than relying on OSL? Any plans for a native node like that in Vray?

[peter_horvath]

There's no dedicated node to randomize UVs. You can put a shader graph together with uv_transform, utility, etc. shaders, or write/look for an OSL shader as you said, which is probably simpler and more efficient.

[mckenzie2VER2]

With that in mind how would accomplish randomization per mesh, per face or stochastic tiling? You can also specify how many degrees of rotation and how many steps in that rotation should be randomized. How would this be accomplished?

[peter_horvath]

I was thinking something like:

• Read object id / face id in a utility shader.
• Add a random shader to generate random color from the ids based on a seed value.
• Add a range shader to map to a desired range.
• Connect to the right input of uv_transform.

Don't know if it works though, or covers all your needs, but could be a starting point.

[mckenzie2VER2]

I'd already tried something like that but it didn't work. I was trying to use a range node so I could remap the values to what degrees I wanted, say max rotation of 180 but I get a node error when plugging into the U or V of the image node. If you connect the value node to a tri planar uv offset you don't get the error but then you loose the ability to just offset one of the UV's.

[peter_horvath]

The UV parameters on the image node are not linkable. Try using a uv_transform shader, where you can link to the inputs.

To control components of a vector separately, like you mentioned the UV offset of triplanar, you can use a float_to_rgb shader.

[mckenzie2VER2]

Like this?

[peter_horvath]

Yes, that's what I was thinking. Does it work ok?

[mckenzie2VER2]

I think so, but haven't played with it much, to busy watching the World Cup!

[mckenzie2VER2]

 

 

[mckenzie2VER2]

BTW, when I first tried this, it hard crashed my Mac.

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\f0\fs24 \cf0 \uc0\u711 panic(cpu 4 caller 0xffffff80232d3941): userspace watchdog timeout: no successful checkins from WindowServer in 120 seconds\
WindowServer has not exited since first loaded\
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\
Panicked task 0xffffff95528759d8: 3 threads: pid 130: watchdogd\
Backtrace (CPU 4), panicked thread: 0xffffff955545f598, Frame : Return Address\
0xfffffff842377590 : 0xffffff801ffedf9d \
0xfffffff8423775e0 : 0xffffff802015b786 \
0xfffffff842377620 : 0xffffff802014aa10 \
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0xfffffff842377d50 : 0xffffff801ffde892 \
0xfffffff842377dc0 : 0xffffff801ffdef9a \
0xfffffff842377ef0 : 0xffffff802012d02a \
0xfffffff842377fa0 : 0xffffff801ff88db6 \
      Kernel Extensions in backtrace:\
         com.apple.driver.watchdog(1.0)[A71DE745-044D-37DB-B730-8F8FFB66B24A]@0xffffff80232d1000->0xffffff80232d3fff\
\
Process name corresponding to current thread (0xffffff955545f598): watchdogd\
\
Mac OS version:\
22A400\
\
Kernel version:\
Darwin Kernel Version 22.1.0: Sun Oct  9 20:14:54 PDT 2022; root:xnu-8792.41.9~2/RELEASE_X86_64\
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System model name: MacPro7,1 (Mac-27AD2F918AE68F61)\
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Hibernation exit count: 0\
\
System uptime in nanoseconds: 256457513499235\
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