lengths along a set of points. This can be used for the sample curves
node, or finding new points along a curve when extending
or shrinking it.
This commit uses it in the snake hook brush as an example.
The logic is similar to the uniform length sampling, but the next
sample length is retrieved from the input instead of multiplication.
For the sample node in the future, though this sort of sampling can be
potentially done more efficiently for specific curve types besides
poly curves, it's simpler, at least as a start, to work on a set of
evaluated points that can be treated like a poly curve.
Differential Revision: https://developer.blender.org/D14571
This commit adds calculation of lengths along the curve for each
evaluated point. This is used for sampling, resampling, the "curve
parameter" node, and potentially more places in the future.
This commit also includes a utility for calculation of uniform samples
in blenlib. It can find evenlyspaced samples along a sequence of points
and use linear interpolation to move data from those points to the
samples. Making the utility more general aligns better with the more
functional approach of the new curves code and makes the behavior
available elsewhere.
A "color math" header is added to allow very basic interpolation
between two colors in the `blender::math` namespace.
Differential Revision: https://developer.blender.org/D14382
