18 Special Constructions

There are 3 types of Special Constructions in Microstation's DDD toolbox:
  • B-Splines
  • Constrained B-Splines
  • B-Spline Cells

B-Splines are like LOCKed elements (no degreees of freedom) and can have points Constrained ON them.

Constrained B-Splines can have their ‘knots' constrained by other Constructions in order to change the shape of the B-Spline, but canNOT have points constrained ON.

B-Spline Cells CAN have points constrained ON, and can also have a directional constraint, tangental contraints and point (from its center), but canNOT have their ‘knots' constrainted.

...watch the video and it all become clear :)

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