Use the MATE_POINTS operation to move a 'slave' control point so that its coordinates are coincident with a 'master' control point.
Master and Slave points do not need to be chosen from the same surface.
Click on the control point you want to act as the master in one of the orthogonal projection views. This control point will be highlighted in green.
Next, click on the control point you want to be moved (the slave point). The coordinates of this second (slave) point will be updated to be indentical to the coordinates of the master control point, and the interpolated surface will be recalculated.
For Bezier surfaces, mated control points increase the weighting in that area of the surface, and the resulting interpolated surface follows these two control points more closely.
For Catmull-Rom surfaces with master and slave control points on the same surface, the resulting interpolated surface folds back and passes through the master and slave control points a second time. This may result in the surface self-intersecting.
Switch between orthogonal projection views and continue mating control points.
Click the icon again to disable the MATE_POINTS mode.
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