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Alter test_sphere to return -1, 0 or 1.

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Representing the side of the plane on which the sphere lies is much more
useful as more complicated tests can be done using just the one call.
-1: the sphere is entirely on the back side of the plane
 0: the sphere is intersecting the plane
 1: the sphere is entirely on the front side of the plane
This commit is contained in:
Bill Currie 2013-03-14 09:05:26 +09:00
parent b9d71218f6
commit 0cae04d71a
1 changed files with 7 additions and 9 deletions
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16
tools/qfvis/source/base-vis.c
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@ -87,17 +87,15 @@ SimpleFlood (portal_t *srcportal, int clusternum)
}
static inline int
test_sphere (sphere_t *sphere, plane_t *plane, int test_front)
test_sphere (sphere_t *sphere, plane_t *plane)
{
float d;
int pass;
int front, back;
d = DotProduct (sphere->center, plane->normal) - plane->dist;
if (test_front)
pass = (d >= -sphere->radius);
else
pass = (d <= sphere->radius);
return pass;
front = (d >= sphere->radius);
back = (d <= -sphere->radius);
return front - back;
}
void
@ -121,9 +119,9 @@ BasePortalVis (void)
if (j == i)
continue;
if (!test_sphere (&tp->sphere, &portal->plane, 1))
if (test_sphere (&tp->sphere, &portal->plane) < 0)
continue; // entirely behind
if (!test_sphere (&portal->sphere, &tp->plane, 0))
if (test_sphere (&portal->sphere, &tp->plane) > 0)
continue; // entirely behind
winding = tp->winding;