I must have had wrong understanding about curves and control points. This curve is centered on Y axis, and control points are symmetrical. I thought the curve should be symmetrical, but it is not. If mirrored on Y axis, it won’t be the same. However, the mirrored curves will have the control points at the exact spots even though they are not the same curvature.
Is it common for different curves to have the exact same control points at the same location?
Curve and control point.3dm (41.0 KB)
Hello, how did you make this curve?
I think the mystery of the antisymmetric curve while control points are symmetric is that the knot vector is not uniform. But it should be uniform in most cases.
See below, the knot vector is not symmetric.
I forgot where and how the curve was derived, but it didn’t look good. I was trying to look better and symmetrical as well.
It was driving me crazy that the curve didn’t mirror up no matter how I perfectly aligned the control points several times.
I didn’t think to check if there were random knots in the curve. Thank you. I wish I knew why and how it happened so that I can avoid the same problem in the future.
The curve is rational and the weight values are not symmetric. This also results in a curve being not symmetric even when the position of the control points are symmetric.
