Mesh Projection #48
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Mesh Projection #48
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tomvanmele
approved these changes
Jun 24, 2025
docs/examples/example_projection.py
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| from compas_cgal.meshing import mesh_project | ||
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| def main(): |
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| // After scaling, use proper AABB tree for projection | ||
| // Define triangle type | ||
| typedef CGAL::Kernel_traits<CGAL::Point_3<compas::Kernel>>::Kernel K; | ||
| typedef CGAL::Triangle_3<K> Triangle; | ||
| typedef std::vector<Triangle>::iterator Iterator; | ||
| typedef CGAL::Ray_3<K> Ray; | ||
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| // Build a list of triangles from the mesh | ||
| std::vector<Triangle> triangles; | ||
| for(auto face : mesh_a.faces()) { | ||
| auto halfedge = mesh_a.halfedge(face); | ||
| auto v0 = mesh_a.source(halfedge); | ||
| auto v1 = mesh_a.target(halfedge); | ||
| auto v2 = mesh_a.target(mesh_a.next(halfedge)); | ||
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| // Add the triangle | ||
| triangles.push_back(Triangle( | ||
| mesh_a.point(v0), | ||
| mesh_a.point(v1), | ||
| mesh_a.point(v2) | ||
| )); | ||
| } | ||
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| // Create the AABB tree | ||
| typedef CGAL::AABB_triangle_primitive_3<K, Iterator> Primitive; | ||
| typedef CGAL::AABB_traits_3<K, Primitive> Traits; | ||
| typedef CGAL::AABB_tree<Traits> Tree; | ||
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| Tree tree(triangles.begin(), triangles.end()); | ||
| tree.accelerate_distance_queries(); |
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not now, but perhaps we could add this as a helper function somewhere, since we probably need this quite often...
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I will make for this a separate pull request, what would be the most common use case?
- Mesh-PointCloud closest-points
- Lines Collection closest-points
- Polyline Colllection closest-points
What else?
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- mesh ray intersections
- bvh construction
- closest point
- ...
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Mesh projection method using two meshes as a source and a target.
Optionally normals of the source mesh can be used.
Implementation details: