Hans Goudey
81f552e9ad
This commit exposes left and right bezier handles as an attribute. Interaction basically works like edit mode. If you move an aligned handle, it also moves the opposite handle of the control point. The difference is that you can't edit "Auto" or "Vector" handles, you have to first use the "Set Handle Type" node. That gives the handle types a bit more meaning in the node tree-- changing them in edit mod is more like a "UI override". The attributes are named `handle_start` and `handle_end`, which is the same name used in the curve RNA API. A new virtual array implementation is added which handles the case of splines that don't have these attributes, and it also calls two new functions on `BezierSpline` to set the handle position accounting for aligned handles. The virtual arrays and attribute providers will be refactored (probably templated) in the future, as a next step after the last built-in curve attribute provider has landed. Differential Revision: https://developer.blender.org/D12005
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