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authorTavian Barnes <tavianator@gmail.com>2010-07-16 18:33:21 -0600
committerTavian Barnes <tavianator@gmail.com>2010-07-16 18:33:21 -0600
commit60439d9a2d359aaa9093e88f01c8a1a0926fa8e7 (patch)
treefc6ef14346b31e6d1f9b48153c154917c4ce6fab /libdimension/cube.c
parentc1fefc78d46764845c406b60015188cc8f5207a9 (diff)
downloaddimension-60439d9a2d359aaa9093e88f01c8a1a0926fa8e7.tar.xz
Speed up cube intersection tests.
Diffstat (limited to 'libdimension/cube.c')
-rw-r--r--libdimension/cube.c143
1 files changed, 60 insertions, 83 deletions
diff --git a/libdimension/cube.c b/libdimension/cube.c
index ac6c5fd..52fff92 100644
--- a/libdimension/cube.c
+++ b/libdimension/cube.c
@@ -54,101 +54,78 @@ dmnsn_cube_intersection_fn(const dmnsn_object *cube, dmnsn_line line,
dmnsn_line line_trans = dmnsn_transform_line(cube->trans_inv, line);
dmnsn_vector nmin, nmax;
- double tmin = -INFINITY, tmax = INFINITY;
-
- if (line_trans.n.x != 0.0) {
- double tx1 = (-1.0 - line_trans.x0.x)/line_trans.n.x;
- double tx2 = (+1.0 - line_trans.x0.x)/line_trans.n.x;
-
- if (tx1 < tx2) {
- if (tx1 > tmin) {
- tmin = tx1;
- nmin = dmnsn_new_vector(-1.0, 0.0, 0.0);
- }
- if (tx2 < tmax) {
- tmax = tx2;
- nmax = dmnsn_new_vector(+1.0, 0.0, 0.0);
- }
- } else {
- if (tx2 > tmin) {
- tmin = tx2;
- nmin = dmnsn_new_vector(+1.0, 0.0, 0.0);
- }
- if (tx1 < tmax) {
- tmax = tx1;
- nmax = dmnsn_new_vector(-1.0, 0.0, 0.0);
- }
- }
+ double tmin, tmax;
+
+ double tx1 = (-1.0 - line_trans.x0.x)/line_trans.n.x;
+ double tx2 = (+1.0 - line_trans.x0.x)/line_trans.n.x;
- if (tmin > tmax)
- return false;
+ if (tx1 < tx2) {
+ tmin = tx1;
+ tmax = tx2;
+ nmin = dmnsn_new_vector(-1.0, 0.0, 0.0);
+ nmax = dmnsn_new_vector(+1.0, 0.0, 0.0);
} else {
- if (line_trans.x0.x < -1.0 || line_trans.x0.x > 1.0)
- return false;
+ tmin = tx2;
+ tmax = tx1;
+ nmin = dmnsn_new_vector(+1.0, 0.0, 0.0);
+ nmax = dmnsn_new_vector(-1.0, 0.0, 0.0);
}
- if (line_trans.n.y != 0.0) {
- double ty1 = (-1.0 - line_trans.x0.y)/line_trans.n.y;
- double ty2 = (+1.0 - line_trans.x0.y)/line_trans.n.y;
-
- if (ty1 < ty2) {
- if (ty1 > tmin) {
- tmin = ty1;
- nmin = dmnsn_new_vector(0.0, -1.0, 0.0);
- }
- if (ty2 < tmax) {
- tmax = ty2;
- nmax = dmnsn_new_vector(0.0, +1.0, 0.0);
- }
- } else {
- if (ty2 > tmin) {
- tmin = ty2;
- nmin = dmnsn_new_vector(0.0, +1.0, 0.0);
- }
- if (ty1 < tmax) {
- tmax = ty1;
- nmax = dmnsn_new_vector(0.0, -1.0, 0.0);
- }
- }
+ if (tmin > tmax)
+ return false;
+
+ double ty1 = (-1.0 - line_trans.x0.y)/line_trans.n.y;
+ double ty2 = (+1.0 - line_trans.x0.y)/line_trans.n.y;
- if (tmin > tmax)
- return false;
+ if (ty1 < ty2) {
+ if (ty1 > tmin) {
+ tmin = ty1;
+ nmin = dmnsn_new_vector(0.0, -1.0, 0.0);
+ }
+ if (ty2 < tmax) {
+ tmax = ty2;
+ nmax = dmnsn_new_vector(0.0, +1.0, 0.0);
+ }
} else {
- if (line_trans.x0.y < -1.0 || line_trans.x0.y > 1.0)
- return false;
+ if (ty2 > tmin) {
+ tmin = ty2;
+ nmin = dmnsn_new_vector(0.0, +1.0, 0.0);
+ }
+ if (ty1 < tmax) {
+ tmax = ty1;
+ nmax = dmnsn_new_vector(0.0, -1.0, 0.0);
+ }
}
- if (line_trans.n.z != 0.0) {
- double tz1 = (-1.0 - line_trans.x0.z)/line_trans.n.z;
- double tz2 = (+1.0 - line_trans.x0.z)/line_trans.n.z;
-
- if (tz1 < tz2) {
- if (tz1 > tmin) {
- tmin = tz1;
- nmin = dmnsn_new_vector(0.0, 0.0, -1.0);
- }
- if (tz2 < tmax) {
- tmax = tz2;
- nmax = dmnsn_new_vector(0.0, 0.0, +1.0);
- }
- } else {
- if (tz2 > tmin) {
- tmin = tz2;
- nmin = dmnsn_new_vector(0.0, 0.0, +1.0);
- }
- if (tz1 < tmax) {
- tmax = tz1;
- nmax = dmnsn_new_vector(0.0, 0.0, -1.0);
- }
- }
+ if (tmin > tmax)
+ return false;
+
+ double tz1 = (-1.0 - line_trans.x0.z)/line_trans.n.z;
+ double tz2 = (+1.0 - line_trans.x0.z)/line_trans.n.z;
- if (tmin > tmax)
- return false;
+ if (tz1 < tz2) {
+ if (tz1 > tmin) {
+ tmin = tz1;
+ nmin = dmnsn_new_vector(0.0, 0.0, -1.0);
+ }
+ if (tz2 < tmax) {
+ tmax = tz2;
+ nmax = dmnsn_new_vector(0.0, 0.0, +1.0);
+ }
} else {
- if (line_trans.x0.z < -1.0 || line_trans.x0.z > 1.0)
- return false;
+ if (tz2 > tmin) {
+ tmin = tz2;
+ nmin = dmnsn_new_vector(0.0, 0.0, +1.0);
+ }
+ if (tz1 < tmax) {
+ tmax = tz1;
+ nmax = dmnsn_new_vector(0.0, 0.0, -1.0);
+ }
}
+ if (tmin > tmax)
+ return false;
+
if (tmin < 0.0) {
tmin = tmax;
nmin = nmax;