As shown in the image above, I attempted to shrink the trimmed surface, but I failed, the control points remain outside the boundary, anybody can tell me how to figure this?
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This is because the control point of the current surface (at the bottom right corner of your screenshot) is already fully in contact with the trimmed edge of the surface. There is also a relevant explanation for this issue in the Help document , described as follows,
Shrinking the trimmed surface can sometimes cause problems later since having the edges so close to the trimming boundaries can cause commands that use the surface edges as input to fail.
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