[Sidefx-houdini-list] mantra -u question

Peter Bowmar pbowmar at gmail.com
Wed Jan 18 14:49:21 EST 2006


Hi Dan,
    Good observations. Shadow do indeed work, which is why I suspect
reflection isn't working. It's not self-reflection, it's reflection of
another object which does cast shadows correctly onto the object being
rendered with -u.

Cheers,

Peter B

On 18/01/06, Dan Seddon <dan.seddon at framestore-cfc.com> wrote:
> Is this self reflection? Maybe try providing a phantom version of your
> object (without the -u option)? It might be considering the target
> object as flatterned in UV space too (do shadows work) - or possibly the
> other way round (though this is less likely as you'd think other things
> would render out incorrectly).... It could be getting quite a few
> different vectors wrong to give this result - though I'd expect you to
> see the same errors in lighting bakes too.
>
> Occlusion in prman is a grid render process which is technically
> different from a call you would use in reflection, so if mantra is the
> same maybe you could understand it's not having the same bugs.
>
> Ta
>
> Dan
>
> >Hey Phil,
> >    Looks to me like it's broken, unless I'm doing something wrong...
> >Occlusion works, so some raytracing is working, but not reflections
> >apparently :(
> >
> >Cheers,
> >
> >Peter B
> >
> >On 18/01/06, Phil Spicer <PSpicer at bournemouth.ac.uk> wrote:
> >
> >
> >>Do you know if it is possible to unwrap a reflection using the mantra -u
> >>/obj/model:uv command? I can get it to unwrap what looks like a metal
> >>shader but without any objects reflected in it. I can get it working
> >>with standard procedural shaders...
> >>
> >>Regards,
> >>
> >>Phil.
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