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.\" RCSid "$Id" |
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.\" RCSid "$Id$" |
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.TH GENSURF 1 11/15/93 RADIANCE |
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.SH NAME |
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gensurf - generate a RADIANCE description of a curved surface |
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gensurf - generate a RADIANCE or Wavefront description of a curved surface |
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.SH SYNOPSIS |
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.B "gensurf mat name 'x(s,t)' 'y(s,t)' 'z(s,t)' m n" |
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[ |
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.B "\-f file" |
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][ |
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.B \-s |
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][ |
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.B \-i |
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][ |
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.B \-o |
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] |
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.br |
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.B "gensurf mat name 'x(s,t)' 'y(s,t)' dfile m n" |
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.B "\-f file" |
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][ |
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.B \-s |
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][ |
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.B \-i |
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][ |
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.B \-o |
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] |
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.br |
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.B "gensurf mat name dfile dfile dfile m n" |
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[ |
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.B \-s |
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][ |
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.B \-i |
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.B \-o |
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] |
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.SH DESCRIPTION |
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.I Gensurf |
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produces a RADIANCE scene description of a |
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functional surface defined by the parametric equations |
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produces either a RADIANCE scene description or a Wavefront .OBJ |
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file of a functional surface defined by the parametric equations |
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.I x(s,t), |
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.I y(s,t), |
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and |
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and |
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.I \-f |
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options. |
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The variable and function definitions in each |
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.I \-f source |
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file are read and compiled from the RADIANCE library where it is found. |
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The |
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.I \-s |
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option adds smoothing (surface normal interpolation) to the surface. |
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The |
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.I \-i |
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option reverses surface normal directions from the standard |
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clockwise-from-front orientation. |
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The |
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.I \-o |
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option produces a Wavefront .OBJ file rather than a RADIANCE |
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scene description. |
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This is most useful as input to the |
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.I obj2mesh(1) |
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program for producing a compiled mesh. |
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A single "usemtl" statement will appear at the beginning |
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of the .OBJ output, echoing the modifier given on the command line. |
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.PP |
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Rough holes may be cut in the mesh by defining a valid(s,t) function. |
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Where this function is positive, polygon vertices will be produced. |
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To generate a 10x20 smoothed height field from 12 recorded vertex |
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z values: |
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.IP "" .2i |
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gensurf dirt ground '10*s' '20*t' height.dat 2 3 -s |
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gensurf dirt ground '10*s' '20*t' height.dat 2 3 \-s |
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.SH ENVIRONMENT |
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RAYPATH the directories to check for auxiliary files. |
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.SH AUTHOR |
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Greg Ward |
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.SH BUGS |
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The smoothing operation requires that functions be defined |
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beyond the [0,1] boundaries of s and t. |
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.SH "SEE ALSO" |
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calc(1), genbox(1), genrev(1), genworm(1), rpict(1), rview(1), xform(1) |
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genbox(1), genrev(1), genworm(1), icalc(1), |
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obj2mesh(1), obj2rad(1), robjutil(1), rpict(1), rvu(1), xform(1) |
