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Adding a spiral between Reverse Curves.

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Hi,

I am trying to create are reverse curve (-R to +R)  in PRT . I am trying to insert a spiral between the two curves such that for half it's legth the radius varies from -R to 0 and in the rest of the length the radius varies from 0 to + R. But however when i add a spiral between the two curves the change in radius along the transition is not as expected. The transition has an at the end of the firstt curve, an initial Radius of a positive high value and it gradually becomes + R at the start of the next curve.

When I try to create two spirals, there s no option in PRT to create a spiral from/to another spiral. Please do help me in finding a solution


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