On
- turns caustic on and off.
Multiplier - this multiplier
controls the strength of the caustics. It is global and applies to all light
sources that generate caustics. If you want different multipliers for the
different light sources then you should use the local light settings.
Note: this multiplier is cumulative with the multipliers in the local
light settings.
Search dist - when VRay traces a photon
that hits an object in some point the raytracer searches for other photons
on the same plane in the surrounding area (search area). The search area in
fact is a circle with center the original photon and its radius is equal to
the Search dist value.
Max photons - when VRay traces a
photon that hits an object in some point and counts the photons in the
surrounding area it then averages the illumination of that area based on the
number of the photons in it. If the photons are more than
Max photons VRay will only take the first
Max photons of them.
Max density - this parameter allows you to
limit the resolution (and this the memory) of the photon map. Whenever VRay
needs to store a new photon in the caustics photon map, it will first look
if there are any other photons within a distance specified by
Max density. If there is already a suitable
photon in the map, VRay will just add the energy of the new photon to the
one in the map. Otherwise, VRay will store the new photon in the photon
map. Using this options allows you to shoot many photons (and thus get
smoother results) while keeping the size of the caustics photon map
manageable.
Mode - controls the mode of the irradiance
map:
New map - when this option is selected a
new photon map will be generated. It will overwrite any previous photon
map left over from previous rendering.
Save to file - hit this button if you want
to save an already generated photon map in a file.
From file - when you enable this option
VRay will not compute the photon map but will load it from a file. Hit
the Browse button on the right to specify the file name.
Don't delete - when checked, VRay
will keep the photon map in memory after the scene rendering has finished.
Otherwise the map will be deleted and the memory it takes will be freed.
This option can be especially useful if you want to compute the photon map
for a particular scene only once and then reuse it for further rendering.
Auto save - when this is turned on, VRay
will automatically save the caustics photon map to the provided file when
rendering is complete.
Switch to saved map - this option is only
available if Auto save is on. It will cause
VRay to automatically set the mode to From file
with the file name of the newly saved map.
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