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better deal with degenerate cases

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This commit is contained in:
David Rose 2012-01-30 21:57:28 +00:00
parent 762f31c27e
commit 6d32be8a1d
1 changed files with 19 additions and 2 deletions
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21
panda/src/grutil/pfmFile.cxx
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@ -686,11 +686,19 @@ generate_vis_points() const {
GeomVertexWriter vertex(vdata, InternalName::get_vertex());
GeomVertexWriter texcoord(vdata, InternalName::get_texcoord());
LPoint2 uv_scale(1.0, 1.0);
if (_x_size > 1) {
uv_scale[0] = 1.0f / PN_stdfloat(_x_size - 1);
}
if (_y_size > 1) {
uv_scale[1] = 1.0f / PN_stdfloat(_y_size - 1);
}
for (int yi = 0; yi < _y_size; ++yi) {
for (int xi = 0; xi < _x_size; ++xi) {
const LPoint3 &point = get_point(xi, yi);
LPoint2 uv(PN_stdfloat(xi) / PN_stdfloat(_x_size - 1),
PN_stdfloat(yi) / PN_stdfloat(_y_size - 1));
LPoint2 uv(PN_stdfloat(xi) * uv_scale[0],
PN_stdfloat(yi) * uv_scale[1]);
if (_vis_inverse) {
vertex.add_data2(uv);
texcoord.add_data3(point);
@ -727,6 +735,11 @@ generate_vis_mesh(MeshFace face) const {
nassertr(is_valid(), NodePath());
nassertr(face != 0, NodePath());
if (_x_size == 1 || _y_size == 1) {
// Can't generate a 1-d mesh, so generate points in this case.
return generate_vis_points();
}
PT(GeomNode) gnode = new GeomNode("");
if (face & MF_front) {
@ -756,6 +769,10 @@ make_vis_mesh_geom(GeomNode *gnode, bool inverted) const {
// This is the number of independent vertices we will require.
int num_vertices = x_size * y_size;
if (num_vertices == 0) {
// Trivial no-op.
return;
}
// This is the max number of vertex indices we might add to the
// GeomTriangles. (We might actually add fewer than this due to