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.\" RCSid "$Id: genblinds.1,v 1.6 2009/04/24 05:20:22 greg Exp $" |
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.TH GENBLINDS 1 10/10/94 RADIANCE |
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.SH NAME |
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genblinds - generate a RADIANCE description of venetian blinds |
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.SH SYNOPSIS |
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.B "genblinds mat name depth width height nslats angle" |
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[ |
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.B "\-r|+r rcurv" |
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] |
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.SH DESCRIPTION |
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.I Genblinds |
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produces a RADIANCE scene description of a set of venetian blinds. |
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The |
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.I depth |
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of the blinds (X dimension) is given first, followed by the |
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.I width |
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(Y dimension), followed by the |
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.I height |
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(Z dimension). |
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The number of slats to place evenly within this height is given as |
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.I nslats. |
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The |
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.I angle |
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of the blind, where zero is perfectly horizontal and a |
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positive angle tilts the positive X edge upwards, is |
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given in degrees. |
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The blinds are initially situated so that the corner of the bottom blind is |
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.I "height/nslats/2" |
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above the XY plane, and all coordinates are positive. |
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Each new slat is placed |
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.I "height/nslats" |
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above the previous one, until the top slat is at |
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.I "height - height/nslats/2". |
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The blinds may of course be moved from this starting point with the |
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.I "xform(1)" |
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command. |
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.PP |
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If curved blinds are desired, a radius of curvature may be given |
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with the |
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.I "+/-r" |
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option. |
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If given as |
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.I +r, |
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the curvature is upward, which is the usual configuration. |
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If the option is given as |
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.I -r, |
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then the curvature is downward. |
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The radius indicates how far from each slat its effective |
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cylindrical center resides. |
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Each slat will be broken into as many polygons as is necessary to |
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keep the delta changes in angle less than 3 degrees. |
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(Note that this may result in a rather large number of polygons.)\0 |
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.SH EXAMPLE |
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To produce a curved set of blinds with 25 slats at 15 degrees: |
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.IP "" .2i |
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genblinds white blind 1 46 88 25 15 \-r 1 > blinds.rad |
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.SH AUTHOR |
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Jean-Louis Scartezzini and Greg Ward |
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.SH "SEE ALSO" |
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genbox(1), genrev(1), gensurf(1), genworm(1), rpict(1), rvu(1), xform(1) |
