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double-check vertex ordering against polygon normal

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This commit is contained in:
David Rose 2003-09-25 19:02:28 +00:00
parent 4b802dc3c5
commit 85caa2fed2
1 changed files with 49 additions and 2 deletions
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51
pandatool/src/mayaegg/mayaToEggConverter.cxx
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@ -1378,7 +1378,7 @@ make_polyset(const MDagPath &dag_path, const MFnMesh &mesh,
if (!status) {
status.perror("MItMeshPolygon::getNormal");
} else {
LVector3d n3d(n[0], n[1], n[2]);
Normald n3d(n[0], n[1], n[2]);
n3d = n3d * vertex_frame_inv;
vert.set_normal(n3d);
}
@ -1414,11 +1414,58 @@ make_polyset(const MDagPath &dag_path, const MFnMesh &mesh,
egg_poly->add_vertex(vpool->create_unique_vertex(vert));
}
// Also get the face normal for the polygon.
Normald face_normal;
bool got_face_normal = false;
MVector n;
status = pi.getNormal(n, MSpace::kWorld);
if (!status) {
status.perror("MItMeshPolygon::getNormal face");
} else {
face_normal.set(n[0], n[1], n[2]);
face_normal = face_normal * vertex_frame_inv;
got_face_normal = true;
egg_poly->set_normal(face_normal);
}
// Now, check that the vertex ordering is consistent with the
// direction of the normals. If not, reverse the vertex ordering
// (since we have seen cases where Maya sets this in contradiction
// to its normals).
Normald order_normal;
if (got_face_normal && egg_poly->calculate_normal(order_normal)) {
if (order_normal.dot(face_normal) < 0.0) {
egg_poly->reverse_vertex_ordering();
mayaegg_cat.info()
<< "reversing polygon\n";
/*
Normald new_normal;
egg_poly->calculate_normal(new_normal);
if (new_normal.dot(order_normal) >= 0.0) {
cerr << "Did not change! orig " << order_normal
<< " new " << new_normal << "\n";
shader = NULL;
egg_poly->write(cerr, 0);
egg_poly->reverse_vertex_ordering();
egg_poly->write(cerr, 0);
} else {
cerr << "reversing prim: orig = "
<< order_normal
<< ", new = " << new_normal << ", net = " << face_normal
<< ", dot = " << order_normal.dot(face_normal)
<< ", new dot = " << new_normal.dot(face_normal) << "\n";
}
*/
}
}
// Now apply the shader.
if (shader != (MayaShader *)NULL) {
set_shader_attributes(*egg_poly, *shader);
}
pi.next();
}