Let's Figure Out 3d Volumetrics!
Even a subtle mist can completely change the image. You’ll be amazed by how much! What if we went nuts and introduced a thick and massive layer of fog? Let’s tame all of those atmospheric effects today!
Topics covered:
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01.
Common Knowledge
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02.
What is volumetrics really about?
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03.
Volume Effect - The Easy Way
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04.
VolumetricMtl - The Right Way
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05.
Part 1/3 - Absorption
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06.
Part 2/3 - Scatterting
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07.
Part 3/3 - Emission
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08.
VolumetricMtl - Setup
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09.
Example #1
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10.
Example #2
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11.
Common Mistakes
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12.
Bonus Part - Directionality
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13.
Conclusion
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14.
Annotations / Links
Common Knowledge
What is Volumetrics Really About?
Volume Effect - The Easy Way
VolumetricMtl - The Right Way
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Absorption
How thick/thin the fog is
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Scattering
How light behaves in the volume
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Emission
how much of the light is generated inside the volume
Part 1/3 - Absorption
Part 2/3 - Scattering
Part 3/3 - Emission
VolumetricMtl - Setup
Example #1
Example #2
Common Mistakes
Bonus Part - Directionality
1. Back Lighting
Negative values reduce scattering; positive values increase it. In the example below, it’s the brightest around the value of 0,8. Getting even higher deepens the scattering gradient. At the extreme value of 0,99 we can see only faint scattering close to the light position in the scene.
2. Side Lighting
The light behaves similarly with both negative and positive values of directionality. More extreme values will cut its scattering off entirely.
3. Front Lighting
Negative values increase scattering while positive decrease it. In the example scene, it’s the brightest around the value of -0,4. Getting lower from this point will dim the scattering, with a vague upward gradient becoming visible. At the extreme value of -0,99, we can see no scattering at all.
Conclusion?
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