rtweight — Calculate mass, centroid, and volume of geometry using raytracing
rtweight operates on the indicated objects in model.g. Material density information and region line of sight (LOS) thickness measurements obtained via ray tracing are used to calculate the mass for each region encountered. It will calculate and report volume of the objects specified. With material properties, it will also report per-region mass information as well as the overall geometric centroid. All calculations take any Boolean operations into consideration.
rtweight can either use density information
stored directly in a .g database or read a density file specified by
the -d option.
If using a density file the file must contain lines with the material number, density in g/cc, and material name, each separated by some white space. See the gqa(1) manual page for more information about defining and managing density information.
The following options are recognized.
-s#Number of rays to fire in X and Y directions (square grid).
Default is 512 (512x512). Conflicts with
-g
-g#Distance between rays in the X and Y directions in
millimeters. Conflicts with -s
-a#Select azimuth in degrees. Used with
-e
and conflicts with
-M
-e#Select elevation in degrees. Used with
-a
and conflicts with
-M
-d fileRead density information from the specified file.
-MRead model2view matrix from standard input.
Conflicts with
-a
and
-e
-rReport individual region weights by region path name and also by region id number. The default only prints the total weight for all the objects specified.
-o fileSend the output to a specified file. The default is to standard output.
-P#Specify the maximum number of processors (in a multi-processor system) to be used for this execution. The default is the maximum number for the machine.
rtweight also accepts all other options that the rt(1) program implements, such as for non-square views, perspective, etc.
Numerous error conditions are possible. Descriptive messages are printed on standard error (file descriptor 2).
Most deficiencies observed while using the rtweight program are usually with the librt(3) package instead.