[gts-general] Help on gts_surface_coarsen function

[Eric C. <cho...@ho...>]

Hi,

I am trying to use the coarsen function, but it's not working.

I am using a 3D range scanner to make a scan of a room, the scanner is 
tilted every 1 degree vertical for about 90 times, and each scan consists of 
about 20 scan points (about a 40 degree range) right in front of the 
scanner. So the uniform points are triangulated (in a very uniform manner). 
Then I put it into gts_surface, and it looks fine. But when I try to coarsen 
it with the coarsen function, it just doesn't do it. It spit back a surface 
that has exact number of faces as before. I use the default setting (NULL) 
for cost and coarsen function, and the stop function is as follow:

gboolean stop_func(gdouble cost, guint nedge, gpointer data)
{
	gboolean bol;
	if (cost > 0.01)
	  bol = TRUE;
	else
	  bol = FALSE;
	return bol;
}

The smallest costs of my surface (using the length2 criteria) is about 
0.0003. The while loop in the gts_coarsen seems to be running fine (I put a 
printf in the stop_func and it does print things out repetitively)... but 
it's just not doing anything to the surface.

Could it be the fact that my surface is not a closed surface (so 
gts_surface_coarsen couldn't handle it)? Or is it something else I missed in 
my code?

Any help is appreciated.. Thanks!

Eric




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