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fix nan's in -tbnall

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This commit is contained in:
David Rose 2006-10-02 18:37:59 +00:00
parent 81f6d464b7
commit a6f7c7806b
1 changed files with 22 additions and 5 deletions
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19
panda/src/egg/eggGroupNode.cxx
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@ -1898,11 +1898,17 @@ r_collect_tangent_binormal(const GlobPattern &uv_name,
double t1 = w2[1] - w1[1];
double t2 = w3[1] - w1[1];
double r = 1.0f / (s1 * t2 - s2 * t1);
double denom = (s1 * t2 - s2 * t1);
if (denom == 0.0) {
ref._sdir.set(0.0, 0.0, 0.0);
ref._tdir.set(0.0, 0.0, 0.0);
} else {
double r = 1.0 / denom;
ref._sdir.set((t2 * x1 - t1 * x2) * r, (t2 * y1 - t1 * y2) * r,
(t2 * z1 - t1 * z2) * r);
ref._tdir.set((s1 * x2 - s2 * x1) * r, (s1 * y2 - s2 * y1) * r,
(s1 * z2 - s2 * z1) * r);
}
// Store the vertex referenced to the polygon.
ref._vertex = i;
@ -1952,6 +1958,17 @@ do_compute_tangent_binormal(const TBNVertexValue &value,
tdir += ref._tdir;
}
// If sdir and/or tdir are zero, choose an arbitrary vector instead.
// (This is really the only reason we normalize sdir and tdir,
// though it also helps stabilize the math below in case the vectors
// are very small but not quite zero.)
if (!sdir.normalize()) {
sdir.set(1.0, 0.0, 0.0);
}
if (!tdir.normalize()) {
tdir = sdir.cross(Normald(0.0, 0.0, -1.0));
}
Normald tangent = (sdir - value._normal * value._normal.dot(sdir));
tangent.normalize();