Revision: 71572
http://sourceforge.net/p/brlcad/code/71572
Author: starseeker
Date: 2018-08-24 00:31:44 +0000 (Fri, 24 Aug 2018)
Log Message:
-----------
take a guess as to what size we will want for polygonization, based on the bbox
size.
Modified Paths:
--------------
brlcad/trunk/src/libanalyze/wnsurface.cxx
Modified: brlcad/trunk/src/libanalyze/wnsurface.cxx
===================================================================
--- brlcad/trunk/src/libanalyze/wnsurface.cxx 2018-08-23 23:26:35 UTC (rev
71571)
+++ brlcad/trunk/src/libanalyze/wnsurface.cxx 2018-08-24 00:31:44 UTC (rev
71572)
@@ -668,6 +668,13 @@
*
* http://www.unchainedgeometry.com/jbloom/papers.html
* https://github.com/Tonsty/polygonizer
+ *
+ * TODO: see if the following paper could improve this (no idea how hard
+ * it would be to implement...):
+ *
+ * Bruno Rodrigues de Araújo and Joaquim Armando Pires Jorge, "Adaptive
+ * polygonization of implicit surfaces", Computers & Graphics, Vol. 29, pp.
+ * 686–696 (2005)
*/
extern "C" int
wn_mesh(int **faces, int *num_faces, point_t **vertices, int *num_vertices,
struct rt_pnts_internal *pnts, fastf_t b)
@@ -679,11 +686,26 @@
wntd.wnt = wn_tree_create(pnts);
if (!wntd.wnt) return -1;
+ /* Try to get an estimate of the size we need to get reasonable fidelity
out of the mesh. */
+ double xlen = wntd.wnt->t->hdim[X] * 2;
+ double ylen = wntd.wnt->t->hdim[Y] * 2;
+ double zlen = wntd.wnt->t->hdim[Z] * 2;
+ double psize = (xlen < ylen) ? xlen : ylen;
+ psize = (psize < zlen) ? psize : zlen;
+ psize = psize * 0.01;
+
pl = (struct pnt_normal *)pnts->point;
- struct polygonizer_mesh *m = polygonize(&wn_peval, (void *)&wntd, 1, 1,
pl->v, NULL, NULL);
+ /* Note that we do NOT want to limit the portion of the model we are
+ * considering via bounds - in testing that results in incomplete
+ * tessellations of the shape for small values, and on the flip side
+ * doesn't seem to be bothered by arbitrarily large values. Consequently,
+ * we set it to INT_MAX */
+ struct polygonizer_mesh *m = polygonize(&wn_peval, (void *)&wntd, psize,
INT_MAX, pl->v, NULL, NULL);
+
wn_tree_destroy(wntd.wnt);
+ polygonizer_mesh_free(m);
return (m) ? 1 : 0;
}
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