intersectsWithTriangle method
Return the distance from the origin of this to the intersection with
other
if this intersects with other
, or null if the don't intersect.
Implementation
double intersectsWithTriangle(Triangle other) {
const double EPSILON = 10e-6;
final Vector3 point0 = other._point0;
final Vector3 point1 = other._point1;
final Vector3 point2 = other._point2;
_e1
..setFrom(point1)
..sub(point0);
_e2
..setFrom(point2)
..sub(point0);
_direction.crossInto(_e2, _q);
final double a = _e1.dot(_q);
if (a > -EPSILON && a < EPSILON) {
return null;
}
final double f = 1 / a;
_s
..setFrom(_origin)
..sub(point0);
final double u = f * (_s.dot(_q));
if (u < 0.0) {
return null;
}
_s.crossInto(_e1, _r);
final double v = f * (_direction.dot(_r));
if (v < -EPSILON || u + v > 1.0 + EPSILON) {
return null;
}
final double t = f * (_e2.dot(_r));
return t;
}