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-rw-r--r--libdimension/prtree.c30
1 files changed, 14 insertions, 16 deletions
diff --git a/libdimension/prtree.c b/libdimension/prtree.c
index 04e7de9..e950917 100644
--- a/libdimension/prtree.c
+++ b/libdimension/prtree.c
@@ -529,7 +529,11 @@ dmnsn_ray_box_intersection(dmnsn_line line, dmnsn_bounding_box box, double t)
{
double tmin = -INFINITY, tmax = INFINITY;
- if (line.n.x != 0.0 && box.min.x < box.max.x) {
+ /* Detenerate box test */
+ if (box.min.x >= box.max.x)
+ return false;
+
+ if (line.n.x != 0.0) {
double tx1 = (box.min.x - line.x0.x)/line.n.x;
double tx2 = (box.max.x - line.x0.x)/line.n.x;
@@ -538,12 +542,11 @@ dmnsn_ray_box_intersection(dmnsn_line line, dmnsn_bounding_box box, double t)
if (tmin > tmax)
return false;
- } else {
- if (line.x0.x < box.min.x || line.x0.x > box.max.x)
- return false;
+ } else if (line.x0.x < box.min.x || line.x0.x > box.max.x) {
+ return false;
}
- if (line.n.y != 0.0 && box.min.y < box.max.y) {
+ if (line.n.y != 0.0) {
double ty1 = (box.min.y - line.x0.y)/line.n.y;
double ty2 = (box.max.y - line.x0.y)/line.n.y;
@@ -552,12 +555,11 @@ dmnsn_ray_box_intersection(dmnsn_line line, dmnsn_bounding_box box, double t)
if (tmin > tmax)
return false;
- } else {
- if (line.x0.y < box.min.y || line.x0.y > box.max.y)
- return false;
+ } else if (line.x0.y < box.min.y || line.x0.y > box.max.y) {
+ return false;
}
- if (line.n.z != 0.0 && box.min.z < box.max.z) {
+ if (line.n.z != 0.0) {
double tz1 = (box.min.z - line.x0.z)/line.n.z;
double tz2 = (box.max.z - line.x0.z)/line.n.z;
@@ -566,15 +568,11 @@ dmnsn_ray_box_intersection(dmnsn_line line, dmnsn_bounding_box box, double t)
if (tmin > tmax)
return false;
- } else {
- if (line.x0.z < box.min.z || line.x0.z > box.max.z)
- return false;
- }
-
- if (tmax < 0.0)
+ } else if (line.x0.z < box.min.z || line.x0.z > box.max.z) {
return false;
+ }
- return tmin < t;
+ return tmax >= 0.0 && tmin < t;
}
static void