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Correct the projection code.

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That needed to be the intersection of two coplanar lines.
This commit is contained in:
Bill Currie 2011-11-28 09:02:16 +09:00
parent ab2ec644d6
commit 996859c367
1 changed files with 9 additions and 9 deletions
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18
libs/models/trace.c
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@ -277,20 +277,18 @@ edge_portal_dist (const plane_t *plane, const clipport_t *portal,
{
vec3_t e;
vec_t frac = 1.0;
vec_t ee;
plane_t ep;
// set up the plane through which the edge travels
VectorSubtract (p2, p1, e);
ee = DotProduct (e, e);
CrossProduct (e, vel, ep.normal);
ep.dist = DotProduct (p1, ep.normal);
ep.type = 3;
for (i = 0; i < winding->numpoints; i++) {
vec_t t, te, vn;
vec_t t, vn;
const vec_t *r = winding->points[i];
const vec_t *v = edges->points[i];
vec3_t x, y, z;
vec3_t x, y;
vn = DotProduct (v, ep.normal);
if (!vn) // FIXME epsilon
@ -304,13 +302,15 @@ edge_portal_dist (const plane_t *plane, const clipport_t *portal,
VectorSubtract (x, p1, y);
t = DotProduct (y, vel) / DotProduct (vel, vel);
VectorMultSub (x, t, vel, y);
VectorSubtract (y, p1, y);
t = DotProduct (y, y) / DotProduct (e, y);
if (t < 0 || t > 1)
continue; // the edge misses the portal edge
VectorMultAdd (p1, t, e, y);
VectorSubtract (x, y, y);
t = DotProduct (y, vel) / DotProduct (vel, vel);
if (t >= frac)
continue; // this is not the nearest edge pair
// check projected impact point's position along the edge
VectorSubtract (y, p1, z);
te = DotProduct (z, e);
if (te < 0 || te > ee)
continue; // the edge misses the portal edge
// the edges hit, and they are the closes edge pair so far
frac = t;
}