Synchronization

ARC LENGTH

When using the arc length sweeping synchronization in creating a shape, the sweeping on the curves is made proportionally to their length.

PARAMETRIC

When using the parametric sweeping synchronization in creating a shape, TopSolid tries to make in correspondence the natural curve parameters.

Example:

The parametric range of a line is [0;1]

The parametric range of a circle is [0;360]

PROPORTIONAL

When you use the proportional synchronization, the curves are adjusted on each tangency point so that the tangents on both side of the point have the same  proportions values as the opposite point on the other curve.

This way, the tangency is constant from one point to the opposite one, and not any edge is created on the shape at these points.

CONTINUOUS

This mode uses the same principle as the proportional synchronisation, except that the curves are adjusted so that the tangents on both side of the point have the same value.

These two modes directly influence the topology of the curves. That made these modes quite sensitive; these modes may not function is every cases.

If this happens, use the proportional or arc length modes.