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.\" RCSid "$Id" |
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.TH COMPAMB 1 1/23/98 RADIANCE |
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.SH NAME |
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compamb - compute good ambient value for a rad input file |
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.SH SYNOPSIS |
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.B compamb |
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[ |
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.B \-c |
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][ |
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.B \-e |
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] |
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.B rad_input_file |
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.SH DESCRIPTION |
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.I Compamb |
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computes a good ambient value for the specified |
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.I rad(1) |
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variable file and appends it to the file as a "render= -av" option. |
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If the |
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.I \-c |
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option is specified, then |
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.I compamb |
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includes color information in the computed ambient value, rather than |
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estimating a grey value to avoid rendering color shifts. |
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If the |
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.I \-e |
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option is specified, then |
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.I compamb |
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also computes a good exposure value for this scene, and appends it to |
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the |
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.I rad |
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file as well. |
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.PP |
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.I Compamb |
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is a shell script that makes calls to other RADIANCE programs and utilities |
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to do the actual work. |
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A substantial amount of time may be required to complete this script, since |
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.I compamb |
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calls |
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.I rpict(1) |
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to render low resolution frames for each view in the |
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.I rad |
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file, setting "QUALITY=High" to compute interreflections. |
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The resulting ambient file is thrown away, since it would disagree |
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with the new -av setting used for the final renderings. |
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This method is preferable to setting the |
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.I \-aw |
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option of |
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.I rpict, |
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which frequently results in splotchy artifacts. |
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.SH AUTHOR |
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Greg Ward Larson |
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.SH "SEE ALSO" |
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lookamb(1), rad(1), rpict(1) |
