Rayfront 1.0 User Manual

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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.

Ambient Value

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.

Ambient Weight

(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.

Ambient Resolution

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.

Ambient Accuracy

This value will approximately equal the error from indirect illuminance interpolation. A value of zero implies no interpolation.

Ambient Divisions

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.

Ambient Super-Samples

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.

Ambient Bounces

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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