Diffuse Indirect Calculation Parameters
The parameters in this section specify the simulation behaviour
for light that is bounced around in the scene diffusely. This is the
most complicated part of the calculation, which is reflected
in the number of parameters that can be set.
Set the red, green and blue component of the
ambient value in radiance units.
This is the final value used in place of
an indirect light calculation. If the number of
ambient bounces is one or greater and the ambient
value weight is non-zero (see
Ambient Weight [-aw] and
Ambient Bounces [-ab] below),
this value may be modified by the computed
indirect values to improve overall accuracy.
(This parameter is not currently exposed for user configuration
in Rayfront, but the default of 0 is used instead)
Set the relative weight of the ambient value
given with the
Ambient Value [-av]
parameter. As new indirect
irradiances are computed, they will modify the
default ambient value in a moving average, with
the specified weight assigned to the initial
value given on the command and all other weights
set to 1. If a value of 0 is given with this
parameter, then the initial ambient value is never
modified. This is the safest value for scenes
with large differences in indirect contributions,
such as when both indoor and outdoor
(daylight) areas are visible.
Set the ambient resolution to this value. This number
will determine the maximum density of ambient
values used in interpolation. Error will start
to increase on surfaces spaced closer than the
scene size divided by the ambient resolution.
The maximum ambient value density is the scene
size times the ambient accuracy (see the
Ambient Accuracy [-aa]
parameter below) divided by the ambient resolution.
The scene size can be determined using
getinfo(1)
with the -d option on the input octree.
A value of zero is interpreted as unlimited resolution.
This value
will approximately equal the error from indirect
illuminance interpolation. A value of zero
implies no interpolation.
The error in the Monte Carlo calculation of indirect
illuminance will be inversely proportional to
the square root of this number. A value of zero
implies no indirect calculation.
Super-samples are applied only to the ambient
divisions which show a significant change. This
increases the spatial density of the sampled points
in those areas of the hemisphere over the current
surface, where they actually make a difference and
can improve accuracy.
This is the maximum number of diffuse bounces computed
by the indirect calculation. A value of zero
implies no indirect calculation.
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