9b5f23c7a3
Updates the `CurveMapping` `CURVE_PRESET_SMOOTH` curve to more closely approximate the smoothstep function (y = 3x^2 - 2x^3). This has the implication of changing what happens when the curve is reset, but does not change any existing curves already stored in blendfiles. Notably, this change primarily affects three operators: * brush.curve_preset (Mesh Sculpting) * brush.sculpt_curves_falloff_preset (Curves Sculpting) * render.shutter_curve_preset (Motion Blur) Pull Request: https://projects.blender.org/blender/blender/pulls/146710
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