85908e9edf
This adds a new `Interpolate Curves` node. It allows generating new curves between a set of existing guide curves. This is essential for procedural hair. Usage: - One has to provide a set of guide curves and a set of root positions for the generated curves. New curves are created starting from these root positions. The N closest guide curves are used for the interpolation. - An additional up vector can be provided for every guide curve and root position. This is typically a surface normal or nothing. This allows generating child curves that are properly oriented based on the surface orientation. - Sometimes a point should only be interpolated using a subset of the guides. This can be achieved using the `Guide Group ID` and `Point Group ID` inputs. The curve generated at a specific point will only take the guides with the same id into account. This allows e.g. for hair parting. - The `Max Neighbors` input limits how many guide curves are taken into account for every interpolated curve. Differential Revision: https://developer.blender.org/D16642
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