Well it's not really a test scene, I was just trying to illustrate the effect of changing the temperature value on a blackbody material. I think it's a really useful material and it's something that some people may have trouble understanding so I thought I'd make it easier to understand. A picture is worth a 1000 words is it not?
So I created a hole bunch of emitters and started at 1500 degrees to 8500 in increments of 500 degrees. I think the result not only illustrates this effect quite well but I think the presentation is rather nice as well if I do say so myself.
Comments/Thoughts?
Blackbody "test" scene
- Borgleader
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Blackbody "test" scene
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- im1249528474.jpg (483.34 KiB) Viewed 2301 times
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Re: Blackbody "test" scene
Interesting concept. It would be nice with a higher polycount and thus more gradual temp changes, but other than that, it looks nice.
- Borgleader
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Re: Blackbody "test" scene
IIRC there are 15 emitters in there. Unless youre talking about the ring, increasing the poly count wont help much.neo0. wrote:Interesting concept. It would be nice with a higher polycount and thus more gradual temp changes, but other than that, it looks nice.
benn hired a mercenary to kill my sig...
Re: Blackbody "test" scene
Yep. You could blend two emitters over one surface and get a cheaper version of the effect, meaning it's not as nice as your exampleComments/Thoughts?
Funny, I was looking at some sodium lamps tonight
edit: woops, the image went away, back now !
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- 1800K gain 10
8500K gain 0.0002
Indigo's default emittance, blend texture is a linear ramp, black to white. - blend_em.jpg (47.31 KiB) Viewed 2265 times
- 1800K gain 10
obsolete asset
Re: Blackbody "test" scene
You know me.. I can't resist screwing around with indigo
Not quite the effect I was shooting for, but I think it turned out neat, never the less. I have a ring with 50 different blackbody materials.
Not quite the effect I was shooting for, but I think it turned out neat, never the less. I have a ring with 50 different blackbody materials.
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- Borgleader
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Re: Blackbody "test" scene
Thats a pretty cool light I may use it in a scene! Could I have a SS of your mat settings?CTZn wrote:Yep. You could blend two emitters over one surface and get a cheaper version of the effect, meaning it's not as nice as your exampleComments/Thoughts?
Funny, I was looking at some sodium lamps tonight
edit: woops, the image went away, back now !
benn hired a mercenary to kill my sig...
Re: Blackbody "test" scene
I assume that you are asking for a screen capture of the blender interface Borgleader, but I don't use blender. I can share the materials xml:
... but it's simpler to say that there are two emitting materials blending along the meshe's length, by using a black to white ramp as blending texture (the mesh has no height, it's one row of faces). Since we are interpolating two values it's no as accurate as the multiple meshes option. Furthermore the light emitted by the "cold" blackbody has been amplified by a factor 50,000 for aesthetical reasons.
Did I miss your point Borgleader ?
Code: Select all
<material>
<name>lambert2SG</name>
<diffuse>
<albedo>
<constant>
<rgb>
<rgb>0 0 0</rgb>
<gamma>2.200000048</gamma>
</rgb>
</constant>
</albedo>
<layer>0</layer>
<base_emission>
<!--spectrumNode-->
<constant>
<blackbody>
<temperature>8500</temperature>
<gain>0.0001999999949</gain>
</blackbody>
</constant>
</base_emission>
</diffuse>
</material>
<material>
<name>lambert3SG</name>
<diffuse>
<albedo>
<constant>
<rgb>
<rgb>0 0 0</rgb>
<gamma>2.200000048</gamma>
</rgb>
</constant>
</albedo>
<layer>0</layer>
<base_emission>
<!--spectrumNode-->
<constant>
<blackbody>
<temperature>1800</temperature>
<gain>10</gain>
</blackbody>
</constant>
</base_emission>
</diffuse>
</material>
<material>
<name>layeredShader1SG</name>
<blend>
<texture>
<uv_set>default</uv_set>
<path>C:/work/3d/archi/MarxDo/Indigo/ramp1-pTorus1.png</path>
<exponent>1</exponent>
<b>1</b>
<c>0</c>
</texture>
<blend>
<texture>
<texture_index>0</texture_index>
</texture>
</blend>
<a_name>lambert2SG</a_name>
<b_name>lambert3SG</b_name>
</blend>
</material>
Did I miss your point Borgleader ?
obsolete asset
- Borgleader
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- Joined: Mon Jun 16, 2008 10:48 am
Re: Blackbody "test" scene
Nope, you pretty much answered it pretty well However, I was aware that you aren't a Blenderhead when I asked for a screenshot
Thanks a lot!
Thanks a lot!
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