Previously, when there were multiple curve points at the same or
almost the same position, the computed tangent was unpredictable.
Now, the handling of this case is more explicit, making it more
predictable. In general, when there are duplicate points, it will just use
tangents from neighboring points now.
Also fixes T98209.
Differential Revision: https://developer.blender.org/D15016
The ported normal calculation from ceed37fc5c neglected to
use the tilt attribute to rotate the normals around the tangents.
This commit adds that behavior back, adding a new math header file
to avoid duplicating the rotation function for normalized axes.
Differential Revision: https://developer.blender.org/D14655
Port the "Normal" and "Curve Tangent" nodes to the new curves data-block
to avoid the conversion to `CurveEval`. This should make them faster by
avoiding all that copying, but otherwise nothing else has changed.
This also includes a fix to move the normal mode as a built-in curve
attribute when converting to and from `CurveEval`. The attribute is
needed because the option is used implicitly in many nodes currently.
Differential Revision: https://developer.blender.org/D14609
