What is the UDIM / Multi UV workflow in houdini

[manx151089]

Hi,

Ive got a model and it has a UDIM texture sequence. What is the workflow for applying a UDIM texture sequence in HTOA or Mantra for in Houdini 15.

Thanks,

Manish

[malexander]

The syntax for UDIM files is filename%(UDIM)d.ext where %(UDIM)d takes the place of the frame number. So if you had image1001.exr, image1002.exr, it'd be image%(UDIM)d.exr.

The texture fields in the principled shader accept this format, and if you're writing your own shader, the Texture VOP has a parameter to expand UDIM sequences which you'll want to enable.

[manx151089]

On 5/14/2016 at 7:53 PM, malexander said:

The syntax for UDIM files is filename%(UDIM)d.ext where %(UDIM)d takes the place of the frame number. So if you had image1001.exr, image1002.exr, it'd be image%(UDIM)d.exr.

The texture fields in the principled shader accept this format, and if you're writing your own shader, the Texture VOP has a parameter to expand UDIM sequences which you'll want to enable.

Thanks!

But what if I am using and arnold standard shader?

[davpe]

with arnold its image<udim>.ext

[Tony Boughen]

I am very new to houdini and am texturing a very large (to scale) cement structure and the UV's are in four UDIM spaces.  They are file named: ramp03diffuse.Base.1011, ramp03diffuse.Base.1012, ramp03diffuse.Base.1013, and ramp03diffuse.Base.1014

"The syntax for UDIM files is filename%(UDIM)d.ext where %(UDIM)d takes the place of the frame number. So if you had image1001.exr, image1002.exr, it'd be image%(UDIM)d.exr."   this is likely very straight forward to anyone who is more experienced.

When I created my tiff's in Mari it exported the four files named exactly as above.  I have tried a number of variations in the naming, (not having dots, 1001 to 1004 instead of 1011 to 1014).  I understand that the four numerals represents the udim space. . . .etc.  Can someone help me figure this out?  I'm getting a headache!

Very much appreciated,  Tony

[michael]

ramp03diffuse.Base.1011 (what is the file format?...lets say .exr)

ramp03diffuse.Base.1011.exr

 filename%(UDIM)d.ext

so...

ramp03diffuse.Base.%(UDIM)d.exr

 

should work...

 

[Tony Boughen]

thanks for the reply, - do you change just the first one, or do you change all four?

[michael]

you'll want all your textures to have the same naming pattern.

[Matt_K]

Hey Tony,
You don't change your texture names - this is the pattern you use on the shader texture fields, and you then enable the UDIM expansion on the Texture VOP - from malexander's post above:

On 5/14/2016 at 4:23 PM, malexander said:

The syntax for UDIM files is filename%(UDIM)d.ext where %(UDIM)d takes the place of the frame number. So if you had image1001.exr, image1002.exr, it'd be image%(UDIM)d.exr.

The texture fields in the principled shader accept this format, and if you're writing your own shader, the Texture VOP has a parameter to expand UDIM sequences which you'll want to enable.

Hop that helps,
Matt.