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How are you updating the spline mesh?
What dose property of the Spline component can be set to draw a rectangle?
Linear. But updating the spline does not automatically update the mesh. You need to update the mesh yourself.
I’m updating splinemesh live. Do you provide an example of a spline drawing rectangle blueprint?
Play with the leave tangents until you get the desired result:
Not sure how your mesh is set up, this is just a minimalistic editor cube:
Not really. Each point will need different tangents. Look at the gizmo → world direction. Compare it to leave tangent as the spline mesh components stretch the mesh between the points. You’ll need to match this direction.