// sequential write of input mesh triangles. preserves triangle IDs up to constant shift.
void write_triangles_flat(TextWriter writer, WriteMesh write_mesh, int[] mapV, DenseUVMesh uvSet, IIndexMap mapUV, bool bNormals, bool bMaterials)
{
bool bUVs = (mapUV != null);
int cur_material = -1;
IMesh mesh = write_mesh.Mesh;
foreach (int ti in mesh.TriangleIndices())
{
if (bMaterials)
{
set_current_material(writer, ti, write_mesh, ref cur_material);
}
Index3i t = mesh.GetTriangle(ti);
t[0] = mapV[t[0]];
t[1] = mapV[t[1]];
t[2] = mapV[t[2]];
if (bUVs)
{
Index3i tuv = (uvSet != null) ? uvSet.TriangleUVs[ti] : t;
tuv[0] = mapUV[tuv[0]];
tuv[1] = mapUV[tuv[1]];
tuv[2] = mapUV[tuv[2]];
write_tri(writer, ref t, bNormals, true, ref tuv);
}
else
{
write_tri(writer, ref t, bNormals, false, ref t);
}
}
}
// update material state if necessary
public void set_current_material(TextWriter writer, int ti, WriteMesh mesh, ref int cur_material)
{
int mi = mesh.TriToMaterialMap[ti];
if (mi != cur_material && mi >= 0 && mi < mesh.Materials.Count)
{
writer.WriteLine("usemtl " + mesh.Materials[mi].name);
cur_material = mi;
}
}