How to create a colour gradient from the root to the tip of the hair strand?

[DanielaAuroch]

Unity version: 2021.3.8f1 Render Pipeline: HDRP

Hi there, I've been using the hair system and I'm trying to create pieces of hair with three different colours, from the hair root to the tip. Like this:

However, I've been unsuccessful in creating this effect. The closest I got was the image below, using the hair vertex position, but it's not the effect desired:

Could you give me some insight on how to achieve the effect I'm looking for? I'm using Shader Graph and this is the graph I currently have:

[qlee01]

I managed to do so just using UV1; the x value gives you the 0-1 value per strand.

[DanielaAuroch]

I managed to do so just using UV1; the x value gives you the 0-1 value per strand.

I was always using either strandUV or rootUV and it didn't occur to me to check the other UV channels. Thanks, that worked great :)

[qlee01]

Yes, not intuitive. Documentation would help a lot.

[fuglsang]

Hi. I will indeed be adding documentation soon (as soon as time allows). Have you tried using "strandUV.y" ? -- this value should be 0 at the root, and 1 at the tip of the longest strand in the particular strand group that the strand is in.

[TCKingCeryn]

Question, I'm relatively new to Shader Graph, but I've got a rough gradient working using the UV1 set, how can i access the strandUV.y value?

[DanielaAuroch]

Question, I'm relatively new to Shader Graph, but I've got a rough gradient working using the UV1 set, how can i access the strandUV.y value?

You can access it by getting the HairVertex node and then splitting the output. strandUV.y should be the "G" value when split.