xenial (1) mksource.1.gz

NAME

       mksource - compute distant sources for RADIANCE image-based lighting

SYNOPSIS

       mksource [ -d nsamps ][ -t thresh ][ -a maxang ] [ octree ]

DESCRIPTION

       Mksource  produces  a  RADIANCE  scene  description  of  distant  illum  sources corresponding to bright,
       concentrated regions in the given ambient environment.  Any  local  geometry  is  ignored  in  the  input
       octree,  which  should  be  derived from a captured light probe and modeled as a distant hemispherical or
       spherical glow source.  The output sources may then be combined with this environment to produce  a  more
       efficient scene for rendering, faster and less prone to sampling artifacts.

       The  -d  option may be used to specify the number of ray samples, which defaults to 262,000.  Calculation
       time is roughly proportional to this setting, and the default is fine enough to resolve sources the  size
       of the sun (half a degree) or larger.

       The  -t  option may be used to manually set the radiance threshold for sources, in watts/sr/meter^2.  The
       default uses the top 2 percentile of the environment, which is usally a good value.

       The -a option may be used to specify a maximum source diameter, which defaults to  15  degrees.   Mkillum
       silently enforces a maximum of 180 degrees for this option.

       If no input octree is specified, the standard input is read.

EXAMPLE

       To add sources with a maximum size of 20 degrees to the enviornment described in environ.oct:

         mksource -a 20 environ.oct > srcs.rad
         oconv -i environ.oct srcs.rad > env+srcs.oct

AUTHOR

       Greg Ward

SEE ALSO

       mkillum(1), rpict(1), rvu(1)