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Ilia

Questions about parallel transport in Houdini rollercoaster modeling.

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Hi, guys, I'm making a procedural modeling of a roller coaster. It looks very common, but I'm stuck in a problem.

After I create a curve, I want to use the parallel transport method to get a smooth orientation, but I find that I do get smooth normal, tangent and bitangent, but I can't smooth them where the ends of the curve are connected.

I mean, if I rotate and translate to the last point based on the normal of the first point, I will not get a smooth orientation where the last point meets the first point (I find that almost all the situations discussed in the tutorial are based on an unclosed curve, and I want to make a closed curve here, I wonder if there is a solution.)

As shown in the figurerollerCoaster01.hip below, there is a smooth orientation in other parts of the curve, except where the curve is connected end to end.

rollercoaster01.jpg

rollercoaster03.jpg

tollercoaster02.jpg

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Out of curiosity, is there a specific reason to implement an advanced algorithm when you can use the Sweep SOP instead? 

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Yes, I do use sweep SOP. I just want to use the algorithm to get a smooth orientation.

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Is your curve closed? Try using an Orientation Along Curve SOP before the Sweep. If that doesn't work, can you post your curve here?

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