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This is a simple example program that shows how to walk a geometry database while performing some operation on geometry as it is encountered.  In this particular example, we iterate just over regions and simply count them:
 
This is a simple example program that shows how to walk a geometry database while performing some operation on geometry as it is encountered.  In this particular example, we iterate just over regions and simply count them:
  
<source lang="C">
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<pre>
 
 
 
#include "common.h"
 
#include "common.h"
 
#include "raytrace.h"
 
#include "raytrace.h"
  
int incr_region(struct db_tree_state *tsp, struct db_full_path *pathp, const struct rt_comb_internal *combp, void *data)
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int incr_region(struct db_tree_state *tsp, struct db_full_path *pathp, const struct rt_comb_internal *combp, genptr_t data)
 
{
 
{
 
   int *counter = (int*)data;
 
   int *counter = (int*)data;
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}
 
}
  
int main(int argc, char *argv[]){
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int
 
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main(int argc, char *argv[])
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{
 
   struct db_i *dbip;
 
   struct db_i *dbip;
 
   int counter = 0;
 
   int counter = 0;
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   bu_log("Database title is:\n%s\n", dbip->dbi_title);
 
   bu_log("Database title is:\n%s\n", dbip->dbi_title);
//  bu_log("Units: %s\n", bu_units_string(dbip->dbi_local2base));
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  bu_log("Units: %s\n", bu_units_string(dbip->dbi_local2base));
  
 
   if (db_lookup(dbip, argv[2], 1) == NULL) {
 
   if (db_lookup(dbip, argv[2], 1) == NULL) {
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   db_walk_tree(dbip, 1, (const char **)argv+2, 1, &state, incr_region, NULL, NULL, &counter);
 
   db_walk_tree(dbip, 1, (const char **)argv+2, 1, &state, incr_region, NULL, NULL, &counter);
  
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  bu_log("counter is %d\n", counter);
  
 
  bu_log("counter is %d\n", counter);
 
 
   return 0;
 
   return 0;
 
 
}
 
}
</source>
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</pre>
  
 
If we compile this program and run it on a sample geometry database, we get the following:
 
If we compile this program and run it on a sample geometry database, we get the following:
  
<source lang="bash">
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<pre>
# you may need to replace /usr/brlcad with the path to where BRL-CAD is installed on your system
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$ gcc db_walk_tree_example.c -L/usr/brlcad/lib -lrt -lbu -I/usr/brlcad/include -I/usr/brlcad/include/brlcad
$ gcc -o db_walk_tree_example -I/usr/brlcad/include -I/usr/brlcad/include/brlcad db_walk_tree_example.c -L/usr/brlcad/lib -lrt -lbu
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$ ./a.out db/ktank.g tank
 
 
$ ./db_walk_tree_example db/ktank.g tank
 
 
Database title is:
 
Database title is:
 
Keith's Tank
 
Keith's Tank
 
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Units: in
 
...incrementing...
 
...incrementing...
 
<... trimmed output ...>
 
<... trimmed output ...>
 
...incrementing...
 
...incrementing...
counter is 83
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counter is 80
</source>
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</pre>

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