Hans Goudey
72d25fa41d
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
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