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Arnold and XGen changing base color

9 REPLIES 9
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Message 1 of 10
Parmenides
433 Views, 9 Replies

Arnold and XGen changing base color

I am using XGen regular not XGen groomable. I can get it to work with the groomable version.

How do you change the base color for for when using Xgen and ai Standard Hair shader? If you input a texture for the Base Color it adds it vertically from base to tip. Adding to the diffuse does the same thing.

I tried following this tutorial but it is very out of date. https://docs.arnoldrenderer.com/display/A5AFMUG/Assigning+Color+to+Splines. Is there a more recent version?

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9 REPLIES 9
Message 2 of 10
lee_griggs
in reply to: Parmenides

Message 3 of 10
Parmenides
in reply to: Parmenides

Thanks for the link. But it is difficult to make sense of. I believe the section "Spline Color" is what you are pointing me to. The scene example provided is missing a graphic and gets errors when loading the Description. So it is hard to tell what the final is supposed to look like.

It says Step 1. "Go to the XGen window (Preview/Output tab) and make a note of the custom shader parameters names." but there aren't going to be any custom shader parameters unless you create them first. Or is it assumed that you are working with the provided (non-working) scene file?

Message 4 of 10
lee_griggs
in reply to: Parmenides

The link should take you to Ramp Implicit UVs at the bottom of the page.

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 5 of 10
Parmenides
in reply to: Parmenides

Thanks, that was helpful. Oddly though I am still getting the same results of shading from the base to tip instead of across the UVs. I made sure the Ai Curve Implicit UVs was unchecked, but no difference.

7792-ramp.png

Message 6 of 10
lee_griggs
in reply to: Parmenides

What does the original scene/render look like?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 7 of 10
Parmenides
in reply to: Parmenides

It looks the same regardless of whether you check or uncheck Ai Curve Implicit UVs.

Message 8 of 10
lee_griggs
in reply to: Parmenides

What happened when you followed this tutorial?

https://docs.arnoldrenderer.com/display/A5AFMUG/Assigning+Color+to+Splines

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 9 of 10
Parmenides
in reply to: Parmenides

Lee, when I tried to follow that tutorial I ran into a few issues. First, the model provided is not the same as the tutorial, it is severely overlapping and causes Xgen to crash (what is the point of that?), It says "Create an Ai UserData Color node and connect it to the Tip Color attribute" I can not find a Tip Color. ? I tried Base color instead. I assume Color Attr Name is now Attribute. But when I get to the end and replace the texture and hit the disk/save icon, I still get black. There are too many variables to guess at to know what part may be wrong. Can you provide a simple working file? That would help tremendously. Thanks.

Message 10 of 10
lee_griggs
in reply to: Parmenides

Thanks for the feedback Derryl. I updated the tutorial and uploaded an updated scene.

A gotcha that caught me out was remembering to press the Disk icon after updating the file texture (otherwise it will render black).

7793-1596094773642.png




Lee Griggs
Arnold rendering specialist
AUTODESK

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