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Lumigons

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qral
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Hi
is there a way of creating luminous geometry inside houdini?

- Rasmus Linck
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fede
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Well, there is a glow shader… but I'm not sure if that is what you are looking for.
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JColdrick
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I think you're using a branded name - doesn't Modo attach that name to it?

AFAICT, it's another word for area light, and yes, Houdini has area lights. Arbitrary data, a lot of work, unless you're using PBR, in which case it's pretty straightforward.

Cheers,

J.C.
John Coldrick
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qral
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@ fede: thanks for the suggestion, but I did a quick test with the glow material and it is more like a fake volumetric light thing, the solution I am after is geometry that emits light from itself, I have made a quick render in Modo with a “lumigon” torus, its just a standard material with a “luminous Intensity” and color…

@JColdrick: Yes I have the concept from Modo… I have used it a lot in Modo and I find that it is a very versatile creative light tool… I did know about the area light option in Houdini but find it rather limited compared to the “light emitting material” solution. I really hope to find a way to do this in houdini…

- RL

Attachments:
lumigon quick.jpg (82.4 KB)

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fede
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So it's almost like a luma material in MAX, something you could use as a neon sign. Been trying to get a shader to work but with my current limited knowledge I can't get it any where… Sorry.
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jason_iversen
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In Mantra, you can make any object “emit” light just by giving it a constant color and relying on diffuse reflection (indirect illumination) to take care of the illumination it provides. You need to either use irradiance (see the Global Illumination light shader) or Physically Based Rendering to see this result, though.

Attachments:
hou_pbr_lumigon.jpg (19.7 KB)
hou_irradiance_lumigon.hipnc (317.7 KB)
hou_pbr_lumigon.hipnc (382.9 KB)

Jason Iversen, Technology Supervisor & FX Pipeline/R+D Lead @ Weta FX
also, http://www.odforce.net [www.odforce.net]
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qral
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Thanks for your help! its just what I was looking for
the only drawback is the increased render time, about 5min, in comparison the Modo render took 30 sec
BTW did a test with a diffuse map…

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lumigon map.jpg (13.5 KB)

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wolfwood
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<edit> Jim Fail </edit>
Edited by - Jan. 30, 2009 12:44:30
if(coffees<2,round(float),float)
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fede
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Thank you so much for posting the two options, rally interesting for me to see the two options.
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