// =================================================================
// Read all loose edges.
// Important: This function assumes that all edges from existing 
// faces have allready been generated and added to me->medge
// So this function MUST be called after read_faces() (see below)
// =================================================================
void MeshImporter::read_lines(COLLADAFW::Mesh *mesh, Mesh *me)
{
	unsigned int loose_edge_count = get_loose_edge_count(mesh);
	if (loose_edge_count > 0) {

		unsigned int face_edge_count  = me->totedge;
		/* unsigned int total_edge_count = loose_edge_count + face_edge_count; */ /* UNUSED */
		
		mesh_add_edges(me, loose_edge_count);
		MEdge *med = me->medge + face_edge_count;

		COLLADAFW::MeshPrimitiveArray& prim_arr = mesh->getMeshPrimitives();

		for (int i = 0; i < prim_arr.getCount(); i++) {
			
			COLLADAFW::MeshPrimitive *mp = prim_arr[i];

			int type = mp->getPrimitiveType();
			if (type == COLLADAFW::MeshPrimitive::LINES) {
				unsigned int edge_count  = mp->getFaceCount();
				unsigned int *indices    = mp->getPositionIndices().getData();
				
				for (int i = 0; i < edge_count; i++, med++) {
					med->bweight = 0;
					med->crease  = 0;
					med->flag   |= ME_LOOSEEDGE;
					med->v1      = indices[2 * i];
					med->v2      = indices[2 * i + 1];
				}
			}
		}

	}
}
Beispiel #2
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unsigned int MeshImporter::get_loose_edge_count(COLLADAFW::Mesh *mesh) {
	COLLADAFW::MeshPrimitiveArray& prim_arr = mesh->getMeshPrimitives();
	int loose_edge_count = 0;

	// collect edge_count and face_count from all parts
	for (int i = 0; i < prim_arr.getCount(); i++) {
		COLLADAFW::MeshPrimitive *mp = prim_arr[i];
		int type = mp->getPrimitiveType();
		switch (type) {
			case COLLADAFW::MeshPrimitive::LINES: {
				size_t prim_totface = mp->getFaceCount();
				loose_edge_count += prim_totface;
				break;
			}
			default: break;
		}
	}
	return loose_edge_count;
}
// =======================================================================
// Read all faces from TRIANGLES, TRIANGLE_FANS, POLYLIST, POLYGON
// Important: This function MUST be called before read_lines() 
// Otherwise we will loose all edges from faces (see read_lines() above)
//
// TODO: import uv set names
// ========================================================================
void MeshImporter::read_polys(COLLADAFW::Mesh *collada_mesh, Mesh *me)
{
	unsigned int i;
	
	allocate_poly_data(collada_mesh, me);

	UVDataWrapper uvs(collada_mesh->getUVCoords());
	VCOLDataWrapper vcol(collada_mesh->getColors());

	MPoly *mpoly = me->mpoly;
	MLoop *mloop = me->mloop;
	int loop_index = 0;

	MaterialIdPrimitiveArrayMap mat_prim_map;

	COLLADAFW::MeshPrimitiveArray& prim_arr = collada_mesh->getMeshPrimitives();
	COLLADAFW::MeshVertexData& nor = collada_mesh->getNormals();

	for (i = 0; i < prim_arr.getCount(); i++) {
		
		COLLADAFW::MeshPrimitive *mp = prim_arr[i];

		// faces
		size_t prim_totpoly                           = mp->getFaceCount();
		unsigned int *position_indices                = mp->getPositionIndices().getData();
		unsigned int *normal_indices                  = mp->getNormalIndices().getData();


		bool mp_has_normals = primitive_has_useable_normals(mp);
		bool mp_has_faces   = primitive_has_faces(mp);

		int collada_meshtype = mp->getPrimitiveType();
		
		// since we cannot set mpoly->mat_nr here, we store a portion of me->mpoly in Primitive
		Primitive prim = {mpoly, 0};

		// If MeshPrimitive is TRIANGLE_FANS we split it into triangles
		// The first trifan vertex will be the first vertex in every triangle
		// XXX The proper function of TRIANGLE_FANS is not tested!!!
		// XXX In particular the handling of the normal_indices looks very wrong to me
		if (collada_meshtype == COLLADAFW::MeshPrimitive::TRIANGLE_FANS) {
			unsigned grouped_vertex_count = mp->getGroupedVertexElementsCount();
			for (unsigned int group_index = 0; group_index < grouped_vertex_count; group_index++) {
				unsigned int first_vertex = position_indices[0]; // Store first trifan vertex
				unsigned int first_normal = normal_indices[0]; // Store first trifan vertex normal
				unsigned int vertex_count = mp->getGroupedVerticesVertexCount(group_index);

				for (unsigned int vertex_index = 0; vertex_index < vertex_count - 2; vertex_index++) {
					// For each triangle store indeces of its 3 vertices
					unsigned int triangle_vertex_indices[3] = {first_vertex, position_indices[1], position_indices[2]};
					set_poly_indices(mpoly, mloop, loop_index, triangle_vertex_indices, 3);

					if (mp_has_normals) {  // vertex normals, same inplementation as for the triangles
						// the same for vertces normals
						unsigned int vertex_normal_indices[3] = {first_normal, normal_indices[1], normal_indices[2]};
						if (!is_flat_face(vertex_normal_indices, nor, 3))
							mpoly->flag |= ME_SMOOTH;
						normal_indices++;
					}
				
					mpoly++;
					mloop += 3;
					loop_index += 3;
					prim.totpoly++;

				}

				// Moving cursor  to the next triangle fan.
				if (mp_has_normals)
					normal_indices += 2;

				position_indices +=  2;
			}
		}

		if (collada_meshtype == COLLADAFW::MeshPrimitive::POLYLIST ||
			collada_meshtype == COLLADAFW::MeshPrimitive::POLYGONS ||
			collada_meshtype == COLLADAFW::MeshPrimitive::TRIANGLES) {
			COLLADAFW::Polygons *mpvc = (COLLADAFW::Polygons *)mp;
			unsigned int start_index = 0;

			COLLADAFW::IndexListArray& index_list_array_uvcoord = mp->getUVCoordIndicesArray();
			COLLADAFW::IndexListArray& index_list_array_vcolor  = mp->getColorIndicesArray();

			for (unsigned int j = 0; j < prim_totpoly; j++) {
				
				// Vertices in polygon:
				int vcount = get_vertex_count(mpvc, j);
				set_poly_indices(mpoly, mloop, loop_index, position_indices, vcount);


				for (unsigned int uvset_index = 0; uvset_index < index_list_array_uvcoord.getCount(); uvset_index++) {
					// get mtface by face index and uv set index
					COLLADAFW::IndexList& index_list = *index_list_array_uvcoord[uvset_index];
					MLoopUV  *mloopuv = (MLoopUV  *)CustomData_get_layer_named(&me->ldata, CD_MLOOPUV, index_list.getName().c_str());
					if (mloopuv == NULL) {
						fprintf(stderr, "Collada import: Mesh [%s] : Unknown reference to TEXCOORD [#%s].\n", me->id.name, index_list.getName().c_str() );
					}
					else {
						set_face_uv(mloopuv+loop_index, uvs, start_index, *index_list_array_uvcoord[uvset_index], vcount);
					}
				}

				if (mp_has_normals) {
					if (!is_flat_face(normal_indices, nor, vcount))
						mpoly->flag |= ME_SMOOTH;
				}


				if (mp->hasColorIndices()) {
					int vcolor_count = index_list_array_vcolor.getCount();

					for (unsigned int vcolor_index = 0; vcolor_index < vcolor_count; vcolor_index++) {

						COLLADAFW::IndexList& color_index_list = *mp->getColorIndices(vcolor_index);
						COLLADAFW::String colname = extract_vcolname(color_index_list.getName());
						MLoopCol *mloopcol = (MLoopCol  *)CustomData_get_layer_named(&me->ldata, CD_MLOOPCOL, colname.c_str());
						if (mloopcol == NULL) {
							fprintf(stderr, "Collada import: Mesh [%s] : Unknown reference to VCOLOR [#%s].\n", me->id.name, color_index_list.getName().c_str());
						}
						else {
							set_vcol(mloopcol + loop_index, vcol, start_index, color_index_list, vcount);
						}
					}
				}

				mpoly++;
				mloop       += vcount;
				loop_index  += vcount;
				start_index += vcount;
				prim.totpoly++;

				if (mp_has_normals)
					normal_indices += vcount;

				position_indices += vcount;
			}
		}

		else if (collada_meshtype == COLLADAFW::MeshPrimitive::LINES) {
			continue; // read the lines later after all the rest is done
		}

		if (mp_has_faces)
			mat_prim_map[mp->getMaterialId()].push_back(prim);


	}

	geom_uid_mat_mapping_map[collada_mesh->getUniqueId()] = mat_prim_map;
}