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This adds support for X/Y/Z symmetry for all brushes in curves
sculpt mode. In theory this can be extended to support radial
symmetry, but that's not part of this patch.
It works by essentially applying a brush stroke multiple with
different transforms. This is similiar to how symmetry works in
mesh sculpt mode, but is quite different from how it worked in
the old hair system (there it tried to find matching hair strands
on both sides of the surface; if none was found, symmetry did
not work).
Differential Revision: https://developer.blender.org/D14795
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This was mostly noticable in the case of the Delete brush, when
clicking somewhere in empty space. It used the closest point on
a curve as brush position.
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- Deprecated headers
- Else after return
- Inconsistent parameter names (I used the most recently modified)
- Raw string literals
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Rename "size" variables and functions to use "num" instead,
based on T85728 (though this doesn't apply to simple C++
containers, it applies here). Rename "range" to "points" in
some functions, so be more specific.
Differential Revision: https://developer.blender.org/D14431
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New supported features:
* 3D/spherical brush that samples a good position on the curves.
* Falloff.
The custom falloff curve mapping is not yet available in the ui because that
requires some more ui reorganization. This is better done when we have
a better understanding of what settings we need exactly.
Currently, the depth of the 3d brush is only sampled once per stroke, when
first pressing LMB. Sometimes it is expected that the depth of the brush can
change within a single brush. However, implementing that in a good way
is not straight forward and might need additional options. Therefore that
will be handled separately. Some experimentation results are in D14376.
Ref T96445.
Differential Revision: https://developer.blender.org/D14376
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