Revision: 69098
http://sourceforge.net/p/brlcad/code/69098
Author: starseeker
Date: 2016-10-17 14:03:16 +0000 (Mon, 17 Oct 2016)
Log Message:
-----------
Investigating why a zero thickness surface mode BoT didn't raytrace, it turns
out that a block of logic used by the standard prep to ensure the bbox
thickness never ended up zero in any dimension was never added to the bottie
prep routines.
Modified Paths:
--------------
brlcad/trunk/NEWS
brlcad/trunk/src/librt/primitives/bot/btg.c
Modified: brlcad/trunk/NEWS
===================================================================
--- brlcad/trunk/NEWS 2016-10-17 12:06:44 UTC (rev 69097)
+++ brlcad/trunk/NEWS 2016-10-17 14:03:16 UTC (rev 69098)
@@ -13,6 +13,7 @@
--- 2016-07-XX Release 7.26.2 ---
----------------------------------------------------------------------
+* fixed TIE raytracing for zero thickness BoTs - Cliff Yapp
* added Wavefront OBJ File->Open GUI support in Archer - Cliff Yapp
* fixed attr show error printing large attribute values - Cliff Yapp
* fixed rt support for lights created prior to rel 6.0 - Sean Morrison
Modified: brlcad/trunk/src/librt/primitives/bot/btg.c
===================================================================
--- brlcad/trunk/src/librt/primitives/bot/btg.c 2016-10-17 12:06:44 UTC (rev
69097)
+++ brlcad/trunk/src/librt/primitives/bot/btg.c 2016-10-17 14:03:16 UTC (rev
69098)
@@ -63,7 +63,7 @@
}
int
-bottie_prep_double(struct soltab *stp, struct rt_bot_internal *bot_ip, struct
rt_i *UNUSED(rtip))
+bottie_prep_double(struct soltab *stp, struct rt_bot_internal *bot_ip, struct
rt_i *rtip)
{
struct tie_s *tie;
struct bot_specific *bot;
@@ -129,6 +129,21 @@
VMOVE(stp->st_min, tie->amin);
VMOVE(stp->st_max, tie->amax);
+
+ /* zero thickness will get missed by the raytracer */
+ if (NEAR_EQUAL(stp->st_min[X], stp->st_max[X], rtip->rti_tol.dist)) {
+ stp->st_min[X] -= rtip->rti_tol.dist;
+ stp->st_max[X] += rtip->rti_tol.dist;
+ }
+ if (NEAR_EQUAL(stp->st_min[Y], stp->st_max[Y], rtip->rti_tol.dist)) {
+ stp->st_min[Y] -= rtip->rti_tol.dist;
+ stp->st_max[Y] += rtip->rti_tol.dist;
+ }
+ if (NEAR_EQUAL(stp->st_min[Z], stp->st_max[Z], rtip->rti_tol.dist)) {
+ stp->st_min[Z] -= rtip->rti_tol.dist;
+ stp->st_max[Z] += rtip->rti_tol.dist;
+ }
+
VMOVE(stp->st_center, tie->mid);
stp->st_aradius = tie->radius;
stp->st_bradius = tie->radius;
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