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Clarify some notation in plane intersection

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Eryn Wells 2014-08-02 10:39:29 -07:00
parent 964b6a5751
commit 20b88f6dac
1 changed files with 4 additions and 4 deletions
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8
src/objectPlane.cc
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@ -91,16 +91,16 @@ Plane::DoesIntersect(const Ray &ray,
*/ */
/* The denominator for the t equation above. */ /* The denominator for the t equation above. */
Double ndotd = mNormal.dot(ray.direction); Double vd = mNormal.dot(ray.direction);
if (ndotd == 0.0) { if (vd == 0.0) {
/* The ray is parallel to the plane. */ /* The ray is parallel to the plane. */
return false; return false;
} }
/* The numerator of the equation for t above. */ /* The numerator of the equation for t above. */
Double ndoto = -(mNormal.dot(ray.origin) + mDistance); Double vo = -(mNormal.dot(ray.origin) + mDistance);
Double t0 = ndoto / ndotd; Double t0 = vo / vd;
if (t0 < 0.0) { if (t0 < 0.0) {
/* The plane is behind the ray's origin. */ /* The plane is behind the ray's origin. */
return false; return false;