how varying materials with renderman

Forums Solaris and Karma how varying materials with renderman

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Piledriver: Member; 99 posts; Joined: Nov. 2018; Offline

Nov. 27, 2020 2:52 p.m.

Hi how i can vary the materials with renderman inside solaris? pxrvary dont' work in houdini 18.5.
Thanks in advance for the help


mtucker: Staff; 4566 posts; Joined: July 2005; Offline

Nov. 27, 2020 3:18 p.m.

Please attach a hip file to show what you tried.


Piledriver: Member; 99 posts; Joined: Nov. 2018; Offline

Nov. 29, 2020 7:31 a.m.

i attached theexample file

Attachments:
pxrVary_example.hiplc (205.3 KB)


mtucker: Staff; 4566 posts; Joined: July 2005; Offline

Nov. 29, 2020 4:20 p.m.

So I've now realized that I don't know what “pxrvary” is supposed to do, so I'm really not sure what it is you're trying to accomplish. But before I realized that I created this modified version of your files using the pxrprimvar VOPs to use a couple of primvars to drive the material (varying per point on the spheres, and also varying per-instance with a primvar on the point instancer itself). If this doesn't cover what you're looking for, then please clarify what you're trying to do. Or maybe someone more knowledgeable about renderman can jump in and save me…

Attachments:
primvar_example.hiplc (229.1 KB)


Piledriver: Member; 99 posts; Joined: Nov. 2018; Offline

Nov. 30, 2020 4:26 a.m.

37/5000
I'm sorry I didn't explain myself well, if for istance i have some instance trees and i want to make some color variation. I hope with this attachment it's more clearly

Edited by Piledriver - Nov. 30, 2020 04:32:31

Attachments:
screenshot.jpg (386.0 KB)


mtucker: Staff; 4566 posts; Joined: July 2005; Offline

Nov. 30, 2020 1:08 p.m.

Is 37/5000 my grade? That's a pretty epic fail

Then I think what I've included there shows the USD way of doing this… Using a pxrprimvar VOP and setting a primvar on the point instancer, with one value per instance. Again, not sure how this relates to pxrvary, so I may still be missing something, but I don't know anything about how pxrvary might show up in USD or how one would drive it…


Piledriver: Member; 99 posts; Joined: Nov. 2018; Offline

Nov. 30, 2020 2:02 p.m.

i don't know why don't work inside houdini and instance node pxr vary work like in the last screenshot, i remember also that in houdini 18.0 worked… i'm not sure if a renderman bugs but i can try woith other methods


Piledriver: Member; 99 posts; Joined: Nov. 2018; Offline

Nov. 30, 2020 2:44 p.m.

i don't know why don't work inside houdini and instance node pxr vary work like in the last screenshot, i remember also that in houdini 18.0 worked… so fo that i have to create a material after instancer lop right?


robp_sidefx: Staff; 597 posts; Joined: June 2020; Offline

Dec. 8, 2020 6:18 a.m.

Here's a slightly-modified version of your scene that will hopefully work for you. I changed the material network to use a PxrVary node, keyed off a “varySeed” primvar added in the instancer (similar to how you were adding “mix”). There's nothing special about the name “varySeed”, but it's important to note the wide range of values (as opposed to the 0-1 range you have with “mix”).

Let me know if you still have trouble with this!

Edited by robp_sidefx - Dec. 8, 2020 06:18:47

Attachments:
pxrvary.png (1.0 MB)
primvar_example_robp.hiplc (222.8 KB)


Piledriver: Member; 99 posts; Joined: Nov. 2018; Offline

Dec. 9, 2020 11:14 a.m.

yes it's work thanks for your time


rdrkrp: Member; 3 posts; Joined: Feb. 2018; Offline

May 11, 2023 2:38 a.m.

when 'identifier Name' selected as vary source, i get unique instances. but changes on each frame of animation. please, whats the reason for this

Attachments:
ezgif.com-gif-maker.gif (442.2 KB)


robp_sidefx: Staff; 597 posts; Joined: June 2020; Offline

May 11, 2023 4:54 a.m.

Can you share your .hip file?


rdrkrp: Member; 3 posts; Joined: Feb. 2018; Offline

May 14, 2023 6:07 a.m.

sure

Attachments:
pxrvary test.hiplc (535.0 KB)


robp_sidefx: Staff; 597 posts; Joined: June 2020; Offline

May 15, 2023 4:52 a.m.

Thanks. I had a quick look and I see the same result. I'm afraid this might be one you'll need to ask the RenderMan For Houdini team about.


Imconected: Member; 20 posts; Joined: April 2016; Offline

Oct. 5, 2025 11:31 a.m.

This is working

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