Blender 2.8 New Features Fast Carve : Constraints
Here is again a new update for the Blender 2.8 Fast Carve addon, I implemented 2 features taht you suggested.
The first one is drawing a primitive rectangle from the center instead of defining 2 points.
The other one is locking the axis (X, Y) when moving a primitive around, I used the keyboard shortcuts X and Y for this.
The addon can be downloaded for free from my github page:
https://github.com/jayanam/fast-carve/tree/fast-carve-2-8
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