DRC1Spatial

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Valid Solid shells cannot be converted to CGAL polyhedra

Here's an example of another shape which can be an algorithm output (you could generate this one with a couple of simple unions or differences) which exhibits the same problem....

Valid Solid shells cannot be converted to CGAL polyhedra

No problem – drop me a line if you need any help and I’ll do my best to assist. Just FYI, here are some renderings of the involved shapes. This...

Valid Solid shells cannot be converted to CGAL polyhedra

> You wrote _Many valid Solids contain "pinched" or self-touching shells_ but who says that they are valid? The norm or a function? algorithm::isValid. If you run it on the...

Valid Solid shells cannot be converted to CGAL polyhedra

I did not initially think that algorithm::isValid was wrong, because this Solid can be produced by boolean operations, has a closed shell that does not self-penetrate, and no discontinuities in...

Valid Solid shells cannot be converted to CGAL polyhedra

> [The SFS](http://portal.opengeospatial.org/files/?artifact_id=25355) doesn't say much about volumes. Yes, to my knowledge, they have not yet published a version that extends to 3D, so there is no appropriate standard. But...

Valid Solid shells cannot be converted to CGAL polyhedra

> Note that in the real world no solid exists with a boundary surface being [non-]manifold. Quite a lot of GIS data represents non-physical things - e.g. electoral districts. A...

Valid Solid shells cannot be converted to CGAL polyhedra

> you can produce some non-manifold surfaces using Boolean operations and you would need a `Nef_polyhedron` for representing such surfaces. This is not correct in all cases - you can...

Valid Solid shells cannot be converted to CGAL polyhedra

A question that I'm interested in knowing the answer to is this: As shown in the example, there are at least some cases involving non-manifold vertices and/or edges which the...