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.\" RCSid "$Id" |
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.\" RCSid "$Id$" |
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.TH VWRAYS 1 1/15/99 RADIANCE |
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.SH NAME |
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vwrays - compute rays for a given picture or view |
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legal view boundaries), then six zero values are sent instead. |
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.PP |
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The |
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.I -i |
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.I \-i |
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option may be used to specify desired pixel positions on the standard |
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input rather than generating all the pixels for a given view. |
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.PP |
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The |
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.I -f |
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.I \-f |
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option may be used to set the record format to something other than the |
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default ASCII. |
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Using raw float or double records for example can reduce the time |
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.I \-vf |
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option. |
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Additionally, the target X and Y dimensions may be specified with |
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.I -x |
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.I \-x |
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and |
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.I -y |
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.I \-y |
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options, and the pixel aspect ratio may be given with |
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.I -p. |
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.I \-pa. |
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The default dimensions are 512x512, with a pixel aspect ratio of 1.0. |
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Just as in |
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.I rpict, |
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the X or the Y dimension will be reduced if necessary |
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to best match the specified pixel |
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aspect ratio, unless this ratio is set to zero. |
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The |
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.I \-pj |
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option may be used to jitter samples. |
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The default value of 0 turns off ray jittering. |
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.PP |
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If the |
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.I -d |
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.I \-d |
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option is given, then |
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.I vwrays |
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just prints the computed image dimensions, which are based on the view |
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aspect and the pixel aspect ratio just described. |
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The |
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.I -ld |
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.I \-ld |
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switch will also be printed, with |
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.I -ld+ |
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.I \-ld+ |
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if the view file has an aft clipping plane, and |
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.I -ld- |
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.I \-ld- |
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otherwise. |
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This is useful for passing options to the |
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.I rtrace |
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correctly by |
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.I rtrace |
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with the |
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.I -ld+ |
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.I \-ld+ |
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option. |
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Note that this option should not be given unless there is an aft |
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clipping plane, since the ray direction vectors will be normalized |
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.PP |
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To determine what the dimensions of a given view would be: |
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.IP "" .2i |
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vwrays -d -vf myview.vf -x 2048 -y 2048 |
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vwrays \-d \-vf myview.vf \-x 2048 \-y 2048 |
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.PP |
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To generate a RADIANCE picture using |
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.I rtrace |
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instead of |
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.I rpict: |
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.IP "" .2i |
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vwrays -ff -vf view1.vf -x 1024 -y 1024 | |
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rtrace `vwrays -d -vf view1.vf -x 1024 -y 1024` -ffc scene.oct > view1.pic |
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vwrays \-ff \-vf view1.vf \-x 1024 \-y 1024 | |
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rtrace `vwrays \-d \-vf view1.vf \-x 1024 \-y 1024` \-ffc scene.oct > view1.pic |
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.SH AUTHOR |
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Greg Ward Larson |
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.SH ACKNOWLEDGMENT |
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a rendered picture, it will only produce standard scanline-ordered rays when |
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given a set of view parameters. |
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.SH "SEE ALSO" |
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rcalc(1), rpict(1), rtrace(1) |
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rcalc(1), rpict(1), rtcontrib(1), rtrace(1) |
