Project a curve onto a point cloud
How to use the Point Clouds > Project Curve tool 
to project a curve along a reference vector onto a point cloud.
Note:
Before you can project a curve, you must create a reference vector to represent the projection direction. See Create or edit a reference vector.
Project a curve onto a point cloud
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Pick the cloud.
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In the Point Clouds tool palette, click the Project Curve tool
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Click the reference vector for the projection direction.
Tip:If you don’t click a reference vector, the tool will use the sight line of the current window.
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Click the curve to project.
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Do any of the following:
- Adjust the curve’s fit to the cloud by typing a new fit tolerance.
- Click another curve to project onto the same point cloud.
Improve the fit between the projected curve and the point cloud
These options are slower but can result in a better fit:
- Increase the Maximum Iterations option.
- Set the Point Location Method option to Surface Intersection.