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Under some circumstances, simply adding a curve object and going
to edit mode would cause a crash. This is because the evaluated
`CurveEval` was accessed but also freed by the dependency graph.
The fix reverts the part of b76918717dbfd8363f that uses the
`CurveEval` for the curve object bounds. While this isn't ideal,
it was the previous behavior, and some unexpected behavior
with object bounds is much better than a crash. Plus, given the plans
of using the new "Curves" data-block for evaluated curves, this
situation will change relatively soon anyway.
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Account for `CurveEval`, which stores the proper deformed and
procedurally created data, unlike the `nurb` list, which has always
just meant a copy of the original curve.
Also account for the case when the curve is empty by using a -1, 1,
fallback bounding box in that case, just like mesh objects.
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The NURB case did not properly handle a curve with only 1 point.
Ref D13904
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This commit improves NURBS knot generation by adding proper support
for the combination of the Bezier and cyclic options. In other cases
the resulting knot doesn't change. This cyclic Bezier knot is used to
create accurate accurate "Nurbs Circle", "Nurbs Cylinder" primitives.
"Nurbs Sphere" and "Nurbs Torus" primitives are also improved by
tweaking the spin operator.
The knot vector in 3rd order NURBS curve with Bezier option turned on
(without cyclic) is changed in comparison to previous calculations,
although it doesn't change the curve shape itself.
The accuracy of the of NURBS circle is fixed, which can be checked by
comparing with mesh circle. Tessellation spacing differences in
circular NURBS is also fixed, which is observable with the NURBS
cylinder and sphere primitives. These were causing seam-like effects.
This commit contains comments from Piotr Makal (@pmakal).
Differential Revision: https://developer.blender.org/D11664
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2-point-curves are treated separately from 3plus-point-curves (assume a
lot of the twisting reduction can be skipped, so there is a dedicated
function for single segment curves).
And while using the 3plus-point-curves function [`make_bevel_list_3D`]
would actually work in this case, the dedicated function
`make_bevel_list_segment_3D` would only consider the tilt of the second
point and would just copy over the quat to the first point as well. Dont
see a reason for this, now consider the first point's tilt as well.
Maniphest Tasks: T94837
Differential Revision: https://developer.blender.org/D13813
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API added in rBa3ad5abf2fe85d623f9e78fefc34e27bdc14632e
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I need this for a refactor I'm looking into for bounding boxes.
It may be helpful in the future when using `CurveEval` in more places.
Differential Revision: https://developer.blender.org/D13596
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