Re: vlax-curve-... functions

Quote:

Originally Posted by

**Opie**

Works!

Pretty good essay,

one thing steel unclear, the part;

"VLAX-CURVE-GETCLOSESTPOINTTOPROJECTION, that projects a point onto the curve in a specific direction and returns the closest point, if any."

Does it mean next:

Projects the point and the curve in a given plane by normal vector on it, let us say (0,0,1)--horizontal plane, and then gives us a closestpoint on that projected curve (in this case horizontal planar curve, 2 dimenzional point )

or :

projects only point on that plane, and gives us closest point on "untouched" curve

or:

????

Thank You in advance!!

Pozdrav iz Hrvatske

Re: vlax-curve-... functions

Quote:

Originally Posted by

**marijan.marsic**
Works!

Pretty good essay,

one thing steel unclear, the part;

"VLAX-CURVE-GETCLOSESTPOINTTOPROJECTION, that projects a point onto the curve in a specific direction and returns the closest point, if any."

Does it mean next:

Projects the point and the curve in a given plane by normal vector on it, let us say (0,0,1)--horizontal plane, and then gives us a closestpoint on that projected curve (in this case horizontal planar curve, 2 dimenzional point )

or :

projects only point on that plane, and gives us closest point on "untouched" curve

or:

????

Thank You in advance!!

Pozdrav iz Hrvatske

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Found :

Returns the closest point (in WCS) on a curve after projecting the curve onto a plane

(vlax-curve-getClosestPointToProjection <curve-obj> <givenPnt> <normal> [extend])

Arguments

* Demands the vl-load-com function.

<curve-obj> - the VLA-object of curve to be measured.

<givenPnt> - a point (in WCS) for which to find the nearest point on the curve.

<normal> - a normal vector (in WCS) for the plane to project onto.

[extend] - if specified and not nil, vlax-curve-getClosestPointToProjection extends the curve when searching for the nearest point.

vlax-curve-getClosestPointToProjection projects the curve onto the plane defined by the givenPnt and normal, and then calculates the nearest point on that projected curve to givenPnt. The resulting point is then projected back onto the original curve, and vlax-curve-getClosestPointToProjection returns that projected point.

Return Values

A 3D point list representing a point on the curve, if successful; otherwise nil.