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Fixed bug in ray/triangle intersection code.

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It was counting intersections behind the ray.
This commit is contained in:
Nathan Vegdahl 2016-06-30 19:33:44 -07:00
parent f927dd0d46
commit 24cbdb5ab9
1 changed files with 5 additions and 1 deletions
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6
src/triangle.rs
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@ -16,6 +16,11 @@ pub fn intersect_ray(ray: &Ray, tri: (Point, Point, Point)) -> Option<(f32, f32,
let tvec = ray.orig - tri.0; let tvec = ray.orig - tri.0;
let qvec = cross(tvec, edge1); let qvec = cross(tvec, edge1);
let t = dot(edge2, qvec) * inv_det;
if t < 0.0 {
return None;
}
let u = dot(tvec, pvec) * inv_det; let u = dot(tvec, pvec) * inv_det;
if u < 0.0 || u > 1.0 { if u < 0.0 || u > 1.0 {
return None; return None;
@ -26,7 +31,6 @@ pub fn intersect_ray(ray: &Ray, tri: (Point, Point, Point)) -> Option<(f32, f32,
return None; return None;
} }
let t = dot(edge2, qvec) * inv_det;
return Some((t, u, v)); return Some((t, u, v));
} else { } else {
return None; return None;