[Sidefx-houdini-list] Rman UVs inverted?

Andrew Lyons tstexture at gmail.com
Fri Jul 22 12:05:32 EDT 2011


Old issue.

>From memory: Houdini reads tiff images from bottom left up. Renderman
is top left down:
http://graphics.stanford.edu/lab/soft/purgatory/prman/Toolkit/programs/txmake.1.html

You can flip t in geometry - but only after your display SOP if you
want viewport display to be correct. You can also do it in the shader
code, or in SOHO perhaps.

Shader code is at least SIMD - so that's probably fastest and most transparent.

Cheers


On 20 July 2011 20:07, Alvaro Castaneda <varomix at gmail.com> wrote:
> yeah, I just found that out seems like t is inverted
>
> Thanks
>
> On Wed, Jul 20, 2011 at 9:05 PM, Alan Warren <bluemoonshine at gmail.com>wrote:
>
>> On Wed, Jul 20, 2011 at 08:22:39PM -0600, Alvaro Castaneda wrote:
>> > Hi Guys
>> > I'm trying to render with 3delight but the uvs
>> > are not correct, I'm not sure what's happening
>> > seems like the uvs are flipped or something
>> > anyone had this issue?
>> >
>> >
>> > THanks
>> >
>> >
>> >
>> It's a known issue.
>>
>> You can supply texture() with (1-t) instead of t and everything will
>> render correctly.
>>
>> Or, provide a toggle parameter if you use your shaders outside of Houdini.
>>
>> texture(mapname, s, (houdini>0)?(1-t):t);
>>
>> HTH
>> _______________________________________________
>> Sidefx-houdini-list mailing list
>> Sidefx-houdini-list at sidefx.com
>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>
> _______________________________________________
> Sidefx-houdini-list mailing list
> Sidefx-houdini-list at sidefx.com
> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>



-- 
=======================================
Andrew D Lyons | Digital Artist | http://www.tstex.com
=======================================



More information about the Sidefx-houdini-list mailing list