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https://git.mirrors.martin98.com/https://github.com/google/draco
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57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
// Copyright 2016 The Draco Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "mesh/mesh_misc_functions.h"
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namespace draco {
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std::unique_ptr<CornerTable> CreateCornerTable(const Mesh *mesh) {
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typedef CornerTable CT;
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const PointAttribute *const att =
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mesh->GetNamedAttribute(GeometryAttribute::POSITION);
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if (att == nullptr)
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return nullptr;
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IndexTypeVector<FaceIndex, FaceType> faces(mesh->num_faces());
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FaceType new_face;
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for (FaceIndex i(0); i < mesh->num_faces(); ++i) {
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const Mesh::Face &face = mesh->face(i);
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for (int j = 0; j < 3; ++j) {
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// Map general vertex indices to position indices.
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new_face[j] = att->mapped_index(face[j]).value();
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}
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faces[FaceIndex(i)] = new_face;
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}
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// Build the corner table.
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return CT::Create(faces);
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}
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PointIndex CornerToPointId(CornerIndex ci, const CornerTable *ct,
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const Mesh *mesh) {
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if (!ct->IsValid(ci))
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return kInvalidPointIndex;
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// Get Face index and local corner index for corner.
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const FaceIndex fi = ct->Face(ci);
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const int lci = ct->LocalIndex(ci);
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// Get the point id.
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return mesh->face(fi)[lci];
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}
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PointIndex CornerToPointId(int c, const CornerTable *ct, const Mesh *mesh) {
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return CornerToPointId(CornerIndex(c), ct, mesh);
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}
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} // namespace draco
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