Add SurfaceVertex
#1048
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Add SurfaceVertex
#1048
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Some code needs to deal with vertices in surface coordinates. Approximation is a current example of that, but there will be more in the future. Calculating these surface coordinates is a bit of an error-prone process, for the same reason that calculating global coordinates is an error-prone process: Surface coordinates that are supposed to be the same can be slightly different, due to floating-point accuracy. By having a `SurfaceVertex`, we're forcing code that creates vertices to calculate those surface coordinates once, and then they are available to all other code that deals with these vertices. This once-at-creation calculation can then benefit from all the protections that are available for the construction of objects (right now, this is the validation infrastructure, but more can be done in the future).
I'm not completely sure if this actually makes a difference, but I think it can rule out some weird edge cases, where global vertices are coincident because the surface connects to itself.
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Add a new form of vertices,
SurfaceVertex, which is defined in 2D surface coordinates. Citing from one of the commit messages:The trade-off is complexity, but I think the added reliability (which isn't realized, since
SurfaceVertexisn't included in validation yet) is worth it. Another way to view this change is that it doesn't add complexity, but just makes the inherent complexity explicit.It would be a bit of a pay-off to update the curve approximation code to not re-compute the surface coordinates. But that would require some more changes there, and I felt that this pull request is already big enough.