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inline bool intersect_ray_aabb(const glm::vec3 &origin, const glm::vec3 &dir, const AABB &aabb) { | |
float tmin, tmax, tymin, tymax, tzmin, tzmax; | |
glm::vec3 bounds[2]; | |
bounds[0] = aabb.min(); | |
bounds[1] = aabb.max(); | |
glm::vec3 invdir = 1.f / dir; | |
glm::i8vec3 sign; | |
sign.x = (invdir.x < 0); | |
sign.y = (invdir.y < 0); | |
sign.z = (invdir.z < 0); | |
tmin = (bounds[sign.x].x - origin.x) * invdir.x; | |
tmax = (bounds[1 - sign.x].x - origin.x) * invdir.x; | |
tymin = (bounds[sign.y].y - origin.y) * invdir.y; | |
tymax = (bounds[1 - sign.y].y - origin.y) * invdir.y; | |
if ((tmin > tymax) || (tymin > tmax)) | |
return false; | |
if (tymin > tmin) | |
tmin = tymin; | |
if (tymax < tmax) | |
tmax = tymax; | |
tzmin = (bounds[sign.z].z - origin.z) * invdir.z; | |
tzmax = (bounds[1 - sign.z].z - origin.z) * invdir.z; | |
if ((tmin > tzmax) || (tzmin > tmax)) | |
return false; | |
if (tzmin > tmin) | |
tmin = tzmin; | |
if (tzmax < tmax) | |
tmax = tzmax; | |
return true; | |
} |
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