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how to find actual point on the surface?

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how to find actual point on the surface?

hello, I have a big problem. I want to find a point on the curved surface, So I use ProSolidRayIntersectionCompute() to get points(picture1). However, the function just gets the point nearby the surface(picture2). That is not on the surface. I want to know whether the toolkit can't find actual intersection points? Does anyone have some advice?

1.PNG2.PNG