'emitters' and material type

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dmn
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'emitters' and material type

Post by dmn » Thu Oct 29, 2009 6:39 am

The attached images have a difference I was not expecting. The scene has an emitter plane in a black diffuse tube pointed at suzanne. The only difference between the two scenes is that one has a specular emitter and the other a diffuse emitter. Why does the diffuse emitter emit so much more light? Why is the specular emitter so much more focused? Shouldn't they be of the same brightness? Does a specular emitter only emit once in the direction of it's normals, while the diffuse emits equally through 180 degrees from the normal?

And secondly why does suzanne appear to have specular reflection when the specular emitter is used, or is that just the way the render is accumulating? The suzanne model uses a diffuse white material.

:arrow: :mrgreen:
Attachments
im1256755044.png
specular emitter
im1256755044.png (142.48 KiB) Viewed 3384 times
im1256754059.png
diffuse emitter
im1256754059.png (913.36 KiB) Viewed 3385 times

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benn
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Re: 'emitters' and material type

Post by benn » Wed Nov 04, 2009 8:34 am

That's a strange one - Ono is best suited to answer this.

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OnoSendai
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Re: 'emitters' and material type

Post by OnoSendai » Wed Nov 04, 2009 10:26 am

Could be a bug. Dmn, can you please simplifiy your scene, maybe so there's just one emitting triangle in a box?

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SmartDen
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Re: 'emitters' and material type

Post by SmartDen » Wed Nov 04, 2009 10:59 pm

i don't have such issues. i tried with and without emission scale - same result
Check normals, dude!

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dmn
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Re: 'emitters' and material type

Post by dmn » Thu Nov 05, 2009 10:40 am

I was running blendigo 2.0.10. Updating to v2.2.1 fixed the problem. It seems there was a bug, or an incompatibility. Thanks for the responses.

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SmartDen
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Re: 'emitters' and material type

Post by SmartDen » Thu Nov 05, 2009 9:34 pm

dmn wrote:I was running blendigo 2.0.10. Updating to v2.2.1 fixed the problem. It seems there was a bug, or an incompatibility. Thanks for the responses.
therefore always write the version you use
Check normals, dude!

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dmn
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Re: 'emitters' and material type

Post by dmn » Fri Nov 06, 2009 4:44 am

Yeah sorry SmartDen. Or update to the latest version before posting about a problem. I should know that by now. :lol:

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