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.SH SYNOPSIS |
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.B mkillum |
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[ |
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+ |
.B "\-n nprocs" |
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+ |
][ |
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.B "rtrace options" |
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] |
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.B octree |
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secondary sources whose contributions can be computed more efficiently by |
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.I rpict(1) |
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and |
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< |
.I rview(1). |
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> |
.I rvu(1). |
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This type of optimization is most useful for windows and skylights which |
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represent concentrated sources of indirect illumination. |
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.I Mkillum |
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These are best handled respectively by the ambient calculation |
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and the secondary source types in RADIANCE. |
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.PP |
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< |
The arguments to |
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> |
If the |
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> |
.I \-n |
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> |
option is specified with a value greater than 1, multiple |
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> |
ray tracing processes will be used to accelerate computation on a shared |
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> |
memory machine. |
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> |
Note that there is no benefit to using more processes |
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> |
than there are local CPUs available to do the work. |
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> |
.PP |
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> |
Remaining arguments to |
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.I mkillum |
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< |
are passed directly to |
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are interpreted as rendering options for |
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.I rtrace(1), |
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< |
which is used to compute the light distributions for the input surfaces. |
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> |
to compute the light distributions for the input surfaces. |
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These surfaces can be any combination of polygons, spheres and rings. |
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Other surfaces may be included, but |
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.I mkillum |
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(Note that this character must be escaped from most shells.) |
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This is necessary so |
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.I mkillum |
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< |
can tell where the arguments to |
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< |
.I rtrace(1) |
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> |
can tell where the rendering arguments |
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end and its own input files begin. |
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.SH VARIABLES |
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.I Mkillum |
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.TP |
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.BR n |
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Do not produce any secondary sources. |
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< |
All input will be passed to the output unaffected. |
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> |
All input will be passed to the output unaffected, except any |
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> |
void surfaces will be removed. |
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.TP |
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.BI b =real |
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Do not produce a secondary source for a surface if its average |
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is zero, then a diffuse source is assumed and no distribution is |
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created. |
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.TP |
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.BI d =string |
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Set the surface Bidirectional Scattering Distribution Function (BSDF) |
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to the given file. |
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The RADIANCE library path will be searched if the file does not begin |
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with a '.' or '~' character. |
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This file must contain an LBNL Window 6 XML specification of a valid |
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BSDF for the given surface, and all rays will be interpreted through |
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this function. |
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The orientation of the BSDF may be controlled with the |
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.I u |
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setting, described below. |
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The thickness of the surface may be controlled with the |
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.I t |
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setting. |
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If this variable has no setting or an integer is specified, |
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.I mkillum |
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+ |
returns to the default behavior of computing the output distribution |
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directly. |
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+ |
.TP |
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.BI s =integer |
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Set the number of ray samples per direction to |
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.I integer. |
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as its alternate material. |
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The default is |
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.I l-. |
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+ |
.TP |
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+ |
.BI u =[+|-]{X|Y|Z} |
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+ |
The given axis will be considered "up" for the purposes of interpreting |
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+ |
BSDF data specified with the |
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+ |
.I d |
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variable. |
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The BSDF will be reoriented relative to the surface as necessary to keep |
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the up vector in the vertical plane that contains this axis and the |
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surface normal, corresponding to an azimuth of 90 degrees. |
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The default up vector is +Z. |
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+ |
.TP |
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+ |
.BI t =real |
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Set the surface thickness to |
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.I real |
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in world coordinates. |
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This value is used for determining where to start rays that need to begin |
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on the opposite side of the surface, specifically to compute the incoming |
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distribution for a BSDF computation. |
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The default value is 0. |
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.SH EXAMPLES |
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The following command generates illum's corresponding to geometry |
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in the files "it1.rad" and "it2.rad": |
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+ |
.IP "" .3i |
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+ |
mkillum \-ab 2 \-ad 1024 \-av .1 .1 .1 basic.oct "<" it1.rad it2.rad > illums.rad |
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.PP |
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The output file "illums.rad" would then be combined with the original |
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scene geometry to create a more easily rendered composite. |
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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 ACKNOWLEDGEMENT |
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Work on this program was initiated and sponsored by the LESO |
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group at EPFL in Switzerland. |
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.SH "SEE ALSO" |
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< |
oconv(1), rad(1), rpict(1), rtrace(1), rview(1) |
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> |
oconv(1), rad(1), rpict(1), rtrace(1), rvu(1) |
