Provided by: radiance_4R0+20110410-1build1_amd64

**NAME**

genrev - generate a RADIANCE description of surface of revolution

**SYNOPSIS**

genrevmatname'z(t)''r(t)'nseg[-eexpr][-ffile][-s]

**DESCRIPTION**

Genrevproduces a RADIANCE scene description of a surface of revolution. The object will be composed ofnsegcones, cups, cylinders, tubes or rings following the parametric curve defined byz(t)(height) andr(t)(radius). Whenzis increasing with t, the surface normal points outward. Whenzis decreasing, the normal points inward. The variabletused in the function expressions varies from 0 to 1 in even steps of1/nseg.The expressions are of the same type used in RADIANCE function files. Auxiliary expressions and/or files may be specified in any number of-eand-foptions. The-soption smooths the surfaces using Phong normal interpolation.

**EXAMPLE**

To generate a torus with an inner radius of 1 and an outer radius of 3: genrev steel torus 'sin(2*PI*t)' '2+cos(2*PI*t)' 32

**AUTHOR**

Greg Ward

**BUGS**

The -s option doesn't modify the surface normal correctly for the opposite side.

**SEE** **ALSO**

genrbox(1), gensurf(1), genworm(1), icalc(1), rpict(1), rvu(1), xform(1)