erebus

view liberebus/src/bvol.cc @ 31:53a98c148bf8

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- introduced SurfaceGeometry to carry all the geometric information input to BRDF sampling and evaluation functions. - made Reflectance keep an (optional) pointer to its material - simplified PhongRefl::sample_dir, with the help of SurfaceGeometry - worked around microsoft's broken std::thread implementation's deadlock on join
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 07 Jun 2014 09:14:17 +0300
parents 4abdce1361b9
children c4d48a21bc4a
line source
1 #include "bvol.h"
2
3 bool AABox::intersect(const Ray &ray) const
4 {
5 Vector3 param[2] = {vmin, vmax};
6 Vector3 inv_dir(1.0 / ray.dir.x, 1.0 / ray.dir.y, 1.0 / ray.dir.z);
7 int sign[3] = {inv_dir.x < 0, inv_dir.y < 0, inv_dir.z < 0};
8
9 float tmin = (param[sign[0]].x - ray.origin.x) * inv_dir.x;
10 float tmax = (param[1 - sign[0]].x - ray.origin.x) * inv_dir.x;
11 float tymin = (param[sign[1]].y - ray.origin.y) * inv_dir.y;
12 float tymax = (param[1 - sign[1]].y - ray.origin.y) * inv_dir.y;
13
14 if(tmin > tymax || tymin > tmax) {
15 return false;
16 }
17 if(tymin > tmin) {
18 tmin = tymin;
19 }
20 if(tymax < tmax) {
21 tmax = tymax;
22 }
23
24 float tzmin = (param[sign[2]].z - ray.origin.z) * inv_dir.z;
25 float tzmax = (param[1 - sign[2]].z - ray.origin.z) * inv_dir.z;
26
27 if(tmin > tzmax || tzmin > tmax) {
28 return false;
29 }
30 if(tzmin > tmin) {
31 tmin = tzmin;
32 }
33 if(tzmax < tmax) {
34 tmax = tzmax;
35 }
36
37 return true;
38 }