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.\" RCSid "$Id: genbox.1,v 1.4 2007/09/04 17:36:40 greg Exp $"
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.TH GENBOX 1 11/15/93 RADIANCE
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.SH NAME
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genbox - generate a RADIANCE or Wavefront description of a box
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.SH SYNOPSIS
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.B "genbox mat name xsiz ysiz zsiz"
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[
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.B \-i
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][
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.B "\-b bev"
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.B "\-r rad"
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[
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.B "\-n nseg
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]
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][
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.B \-o
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]
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.SH DESCRIPTION
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.I Genbox
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produces a RADIANCE scene description of a parallelepiped
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with one corner at the origin and the opposite corner at
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.I "(xsiz, ysiz, zsiz)."
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The sides of the box will be parallel to the three coordinate
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planes.
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The surfaces that make up the box will be modified by
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.I mat
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and their identifiers will begin with
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.I name.
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.PP
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The
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.I \-i
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option can be used to produce a box with inward directed surface
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normals.
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.PP
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The
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.I \-b
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option can be used to specify the indentation for beveled edges.
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.PP
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The
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.I \-r
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option can be used to specify the radius for rounded edges, which
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are modeled as cylinders and spheres for non-inverted RADIANCE output.
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However, this type of model only makes sense for external views of
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an opaque object.
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If a rounded box is inverted using
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.I \-i,
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then the corners and edges are modeled with polygons, instead.
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This option can also be forced by specifying a minum number of
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segments with the
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.I \-n
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option.
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.PP
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The
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.I \-o
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option specifies Wavefront .OBJ output, and
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also forces polygons to be used with the
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.I \-r
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option.
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In this case, vertex normals are also produced for smooth rendering.
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.SH EXAMPLE
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To produce a rectangular box made of wood with rounded edges:
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.IP "" .2i
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genbox wood box1 5 8 3 \-r .5 > box1.rad
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.PP
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To produce a box made of crystal with beveled edges:
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.IP "" .2i
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genbox crystal box2 3 7 1 \-b .1 > box2.rad
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.SH AUTHOR
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Greg Ward
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.SH BUGS
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Because spheres and cylinders are used to construct boxes with
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rounded edges, a transparent box of this type appears quite messy.
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The preferred alternative in this case is the
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.I \-n
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option, which produces polygons, instead.
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However, normal smoothing is only applied to the Wavefront .OBJ output,
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so this must be passed through
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.I obj2rad
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to get perfectly smooth results.
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.SH "SEE ALSO"
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genrev(1), gensurf(1), genworm(1), obj2mesh(1), obj2rad(1),
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robjutil(1), rpict(1), rvu(1), xform(1)
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