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Visualize frame field using vectors instead of boxes

Mattéo Couplet requested to merge frameview into master

The current way to visualize a frame field is to define a tensor field where the 3 branches are stored in the tensor "rows", and choose Aspect -> Tensor display -> Frame. This plots the frames as "boxes", which are often impractical for frame field practitioners:

  • frame field singularities are more difficult to spot,
  • one cannot define separate colors for "anisotropic" frames,
  • they are less flexible than vectors (e.g., no min size).

I added a new visualization option Aspect -> Tensor display -> Frame (vectors) that draws the frame using the more natural "cross" representation: 6 vectors, each corresponding to a branch.

The original visualization remains and is named Frame (box).

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