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Make UVs a property of IfcGeom::Representation::Triangulation. Implement writing of UVs for OBJ output.

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This commit is contained in:
Stinkfist0
2016-03-17 00:25:33 +02:00
parent 923f1212f5
commit 76d3823bd4
5 changed files with 85 additions and 64 deletions
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src/ifcgeom/IfcGeomRepresentation.h
+38
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@@ -102,6 +102,7 @@ namespace IfcGeom {
std::vector<int> _faces;
std::vector<int> _edges;
std::vector<P> _normals;
std::vector<P> uvs_;
std::vector<int> _material_ids;
std::vector<Material> _materials;
VertexKeyMap welds;
@@ -112,8 +113,10 @@ namespace IfcGeom {
const std::vector<int>& faces() const { return _faces; }
const std::vector<int>& edges() const { return _edges; }
const std::vector<P>& normals() const { return _normals; }
const std::vector<P>& uvs() const { return uvs_; }
const std::vector<int>& material_ids() const { return _material_ids; }
const std::vector<Material>& materials() const { return _materials; }
Triangulation(const BRep& shape_model)
: Representation(shape_model.settings())
, _id(shape_model.getId())
@@ -246,6 +249,10 @@ namespace IfcGeom {
}
}
if (!_normals.empty() && settings().get(IfcGeom::IteratorSettings::GENERATE_UVS)) {
uvs_ = box_project_uvs(_verts, _normals);
}
if (num_faces == 0) {
// Edges are only emitted if there are no faces. A mixed representation of faces
// and loose edges is discouraged by the standard. An alternative would be to use
@@ -276,6 +283,37 @@ namespace IfcGeom {
}
}
virtual ~Triangulation() {}
/// Generates UVs for a single mesh using box projection.
/// @todo Very simple impl. Assumes that input vertices and normals match 1:1.
static std::vector<P> box_project_uvs(const std::vector<P> &vertices, const std::vector<P> &normals)
{
std::vector<P> uvs;
uvs.resize(vertices.size() / 3 * 2);
for (size_t uv_idx = 0, v_idx = 0;
uv_idx < uvs.size() && v_idx < vertices.size() && v_idx < normals.size();
uv_idx += 2, v_idx += 3) {
P n_x = normals[v_idx], n_y = normals[v_idx + 1], n_z = normals[v_idx + 2];
P v_x = vertices[v_idx], v_y = vertices[v_idx + 1], v_z = vertices[v_idx + 2];
if (std::abs(n_x) > std::abs(n_y) && std::abs(n_x) > std::abs(n_z)) {
uvs[uv_idx] = v_z;
uvs[uv_idx + 1] = v_y;
}
if (std::abs(n_y) > std::abs(n_x) && std::abs(n_y) > std::abs(n_z)) {
uvs[uv_idx] = v_x;
uvs[uv_idx + 1] = v_z;
}
if (std::abs(n_z) > std::abs(n_x) && std::abs(n_z) > std::abs(n_y)) {
uvs[uv_idx] = v_x;
uvs[uv_idx + 1] = v_y;
}
}
return uvs;
}
private:
// Welds vertices that belong to different faces
int addVertex(int material_index, const gp_XYZ& p) {