Hi!
Does the type of light control how Photons are emitted? For example, if you have a cone light, are all of the photons emitted only inside the Cone?
If so, what controls exactly where the photons are emitted in the Cone- the “Cone Angle” or the Viewing Frustrum (Focal Length/Aperture) of the Light (and why aren't they related)?
Thanks,
Craig
Type of Light and Photons...
4006 5 1- craiglhoffman
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- jason_iversen
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Hi Craig,
You're right; IIRC, Mark told me once that the light shader is analysed and photons are only cast in regions that there is light. So the distribution of the photons are controlled by the shader itself only, not the View of the Light (fov,etc)
You're right; IIRC, Mark told me once that the light shader is analysed and photons are only cast in regions that there is light. So the distribution of the photons are controlled by the shader itself only, not the View of the Light (fov,etc)
Jason Iversen, Technology Supervisor & FX Pipeline/R+D Lead @ Weta FX
also, http://www.odforce.net [www.odforce.net]
also, http://www.odforce.net [www.odforce.net]
- craiglhoffman
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- wolfwood
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- jason_iversen
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The idea of photons is that they're a packet of energy. The amount of energy does not vary per packet - so this means no photons are cast outside the cone.
Hope this helps,
Jason
EDIT: I've just read the other post - but I'm not sure that there are zero-energy photons cast. At least, in my memory I don't remember that; but its VERY easy to test. Use i3dconvert to convert the photon .pmap file into a .bgeo and take a look at the distribution.
Hope this helps,
Jason
EDIT: I've just read the other post - but I'm not sure that there are zero-energy photons cast. At least, in my memory I don't remember that; but its VERY easy to test. Use i3dconvert to convert the photon .pmap file into a .bgeo and take a look at the distribution.
Jason Iversen, Technology Supervisor & FX Pipeline/R+D Lead @ Weta FX
also, http://www.odforce.net [www.odforce.net]
also, http://www.odforce.net [www.odforce.net]
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