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.\" RCSid "$Id$" |
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.TH RTCONTRIB 1 5/25/05 RADIANCE |
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.TH RCONTRIB 1 5/25/05 RADIANCE |
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.SH NAME |
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rcontrib - compute contribution coefficients in a RADIANCE scene |
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.SH SYNOPSIS |
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.br |
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.B "rcontrib [ options ] \-defaults" |
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.SH DESCRIPTION |
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.I Rtcontrib |
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.I Rcontrib |
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computes ray coefficients |
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for objects whose modifiers are named in one or more |
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.I \-m |
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If the |
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.I \-n |
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option is specified with a value greater than 1, multiple |
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.I rtrace |
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processes will be used to accelerate computation on a shared |
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memory machine. |
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Note that there is no benefit to using more processes |
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can be used to compute arbitrary input-output relationships in optical |
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systems, such as luminaires, light pipes, and shading devices. |
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.PP |
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.I Rtcontrib |
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calls |
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.I rtrace(1) |
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with the \-oTW (or \-oTV) option to calculate the daughter ray |
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contributions for each input ray, and the output tallies |
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are sent to one or more destinations according to the given |
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.I Rcontrib |
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sends the accumulated rays tallies |
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to one or more destinations according to the given |
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.I \-o |
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specification. |
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If a destination begins with an exclamation mark ('!'), then |
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.I \-b |
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expression is defined for a particular modifier, |
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the bin number will be evaluated at run time for each |
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ray contribution from |
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.I rtrace. |
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ray contribution. |
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Specifically, each ray's world intersection point will be assigned to |
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the variables Px, Py, and Pz, and the normalized ray direction |
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will be assigned to Dx, Dy, and Dz. |
