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Merge pull request #31756 from raphael10241024/fast_aabb_transform

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a faster function to transform aabb
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Rémi Verschelde 2019-09-03 12:26:43 +02:00 committed by GitHub
parent 35ee5be1dd e7febd72d6
commit 726711d8c5
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 23 additions and 16 deletions
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39
core/math/transform.h
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@ -158,22 +158,29 @@ _FORCE_INLINE_ Plane Transform::xform_inv(const Plane &p_plane) const {
}
_FORCE_INLINE_ AABB Transform::xform(const AABB &p_aabb) const {
/* define vertices */
Vector3 x = basis.get_axis(0) * p_aabb.size.x;
Vector3 y = basis.get_axis(1) * p_aabb.size.y;
Vector3 z = basis.get_axis(2) * p_aabb.size.z;
Vector3 pos = xform(p_aabb.position);
//could be even further optimized
AABB new_aabb;
new_aabb.position = pos;
new_aabb.expand_to(pos + x);
new_aabb.expand_to(pos + y);
new_aabb.expand_to(pos + z);
new_aabb.expand_to(pos + x + y);
new_aabb.expand_to(pos + x + z);
new_aabb.expand_to(pos + y + z);
new_aabb.expand_to(pos + x + y + z);
return new_aabb;
/* http://dev.theomader.com/transform-bounding-boxes/ */
Vector3 min = p_aabb.position;
Vector3 max = p_aabb.position + p_aabb.size;
Vector3 tmin, tmax;
for (int i = 0; i < 3; i++) {
tmin[i] = tmax[i] = origin[i];
for (int j = 0; j < 3; j++) {
real_t e = basis[i][j] * min[j];
real_t f = basis[i][j] * max[j];
if (e < f) {
tmin[i] += e;
tmax[i] += f;
} else {
tmin[i] += f;
tmax[i] += e;
}
}
}
AABB r_aabb;
r_aabb.position = tmin;
r_aabb.size = tmax - tmin;
return r_aabb;
}
_FORCE_INLINE_ AABB Transform::xform_inv(const AABB &p_aabb) const {