Avoid calculating a new split-index when re-fitting.
While checking if a knot can be removed, the index with the highest error
can be used as a candidate to replace the knot
(in the case it can't be removed).
This is an alternative method for fitting a curve which incrementally simplifies the curve, then re-fits.
Generally gives better results, also improves corner detection.
When this flag is set - even when the curve error is under the threshold,
keep attempting a better fit.
Enable this for freehand drawing, since it gives nicer results and isn't noticeably slower.
Add a new fallback method that uses offset distance from the curve to the line between both points,
for freehand drawing it typically only fives minor improvements (1-3% fewer points),
for curve dissolve the improvements are more noticeable.
Take curvature into account when calculating handle length.
Gives significantly better results for curve dissolve and 10-20% more efficient freehand drawing.
- Access with Shift-LMB or from the 'Create' toolbar tab.
- Uses curve fitting for bezier curves, with error and corner angle options.
- Optional tablet pressure to curve radius mapping.
- Depth can use the cursor or optionally draw onto the surface,
for the entire stroke or using the stroke start.
- Stroke plane can optionally be perpendicular to, or aligned to the surface normal.
- Optional radius tapering and for start/end points.
- Supports operator redo and calling from Python.
This will be used for calculating bezier curves from freehand drawing,
may be used for other areas too.
Original code from GraphicsGems, 1990 (FitCurve.c),
with updates from OpenToonz, under 3 clause BSD license.
with own minor modifications for integration with Blender:
- support adding extra custom-data.
- improved handle clamping.
