02-13-2019
Without knowing what you're doing it is very hard to suggest ways to do it in fewer steps! My crystal ball just isn't working that clearly this morning.
What steps did you perform to complete your task? (Please don't include a series of steps that includes rain dancing... From experience, we have found rain dancing produces random results. And, water and electronics don't mix well together.)
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LEARN ABOUT XFREE86
gensurf
GENSURF(1) General Commands Manual GENSURF(1)
NAME
gensurf - generate a RADIANCE or Wavefront description of a curved surface
SYNOPSIS
gensurf mat name 'x(s,t)' 'y(s,t)' 'z(s,t)' m n [ -e expr ][ -f file ][ -s ][ -o ]
gensurf mat name 'x(s,t)' 'y(s,t)' dfile m n [ -e expr ][ -f file ][ -s ][ -o ]
gensurf mat name dfile dfile dfile m n [ -s ][ -o ]
DESCRIPTION
Gensurf produces either a RADIANCE scene description or a Wavefront .OBJ file of a functional surface defined by the parametric equations
x(s,t), y(s,t), and z(s,t). The surface normal is defined by the right hand rule as applied to (s,t). S will vary from 0 to 1 in steps of
1/m, and t will vary from 0 to 1 in steps of 1/n. The surface will be composed of 2*m*n or fewer triangles and quadrilaterals. The
expressions are of the same type used in RADIANCE function files. Auxiliary expressions and/or files may be specified in any number of -e
and -f options. The -s option adds smoothing (surface normal interpolation) to the surface. The -o option produces a Wavefront .OBJ file
rather than a RADIANCE scene description. This is most useful as input to the obj2mesh(1) program for producing a compiled mesh. A single
"usemtl" statement will appear at the beginning of the .OBJ output, echoing the modifier given on the command line.
Rough holes may be cut in the mesh by defining a valid(s,t) function. Where this function is positive, polygon vertices will be produced.
Where it is negative, no geometry will be output. Surface normal interpolation will ignore any invalid vertices.
The second invocation form reads z data values from the file dfile. This file must give either m*n or (m+1)*(n+1) floating point z values.
If m*n values are given, then the values correspond to the centroid of each quadrilateral region. If (m+1)*(n+1) values are given, then
the values correspond to the vertices of each quadrilateral region. The ordering of the data in the file is such that the s values are
changing faster than the t values. If a minus ('-') is given for dfile, then the values are read from the standard input.
The third invocation form is used to read coordinate triplets from a file or the standard input. The three dfile arguments must all be the
same, and the corresponding file must contain three floating point values for each point location. The ordering and other details are the
same as those described for z value files above.
EXAMPLE
To generate a tesselated sphere:
gensurf crystal ball 'sin(PI*s)*cos(2*PI*t)' 'cos(PI*s)' 'sin(PI*s)*sin(2*PI*t)' 7 10
To generate a 10x20 smoothed height field from 12 recorded vertex z values:
gensurf dirt ground '10*s' '20*t' height.dat 2 3 -s
AUTHOR
Greg Ward
BUGS
The smoothing operation requires that functions be defined beyond the [0,1] boundaries of s and t.
SEE ALSO
genrbox(1), genrev(1), genworm(1), icalc(1), obj2mesh(1), obj2rad(1), rpict(1), rvu(1), xform(1)
RADIANCE
11/15/93 GENSURF(1)