Curve+Curve+Spiral

[Umit.Arslan]

Hi

How can i add a "curve+curve+spiral" to the PI point "S1"?

Thanks

[ericcollins6932]

I would break up the alignment so I could use adding curves from end of entity (starting at S1) and go from there. Others might have better suggestions.

[sboon · Accepted solution]

Start by breaking apart the PI, then you can add the pieces you need to connect the tangents.  It depends on what parts of the curve-curve-spiral are constrained and which are not.  I've attached a drawing with several possible combinations.

• The first alignment has a floating curve with a specified radius attached to the incoming tangent, a second floating curve attached to that and a free spiral connecting to the outgoing tangent.
• The second alignment has a floating curve-spiral with specified radius and spiral length attached to the outgoing tangent and then a free curve between that and the incoming tangent.
• The third alignment has a curve with fixed centerpoint and radius in the middle, then a free curve connecting from the incoming tangent to it, and a free spiral connecting to the outgoing tangent.

There are probably more possibilities - choose the elements that work for your situation.

Steve
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