vtkPolyDataNormals - Cell Normals

[emil-peters]

Need

At the moment, the vtkPolyDataNormals is only able to calculate the vertex normals.
I might be interesting to also compute the cell normals instead based on a programmatically set boolean.

Based on the suggestion of @finetjul in this reply

ps. You can assign me on this issue.

[luistorrescisneros]

I will use this spot to draw my concern cause it is somehow related. How it is posible to a attach a normal vector to a single point? I came across it, when using vtkPolyDataNormals to compute the normals of some cells, since a cell in some situations represents a surface. Basic mathematics teach us a normal vector can be computed solely on N-Dimensional (where N>2) surfaces. In other words, not on single points or even lines.

[finetjul]

A point typically has the same normal of the cell.
I agree it is usually more useful to have cell normals than point normals.

[github-actions]

🎉 This issue has been resolved in version 28.12.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• GitHub release

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