Find intersection of 3dface(acdbFace) with line (acdbline)

[majklha]

A have group of 3dFaces defining some terrain surface and I need get the high in degined 2d origin. It means intersection this surface (part of surface) with vertical line gone througth this 2d point. 

How to do it?

[Alexander.Rivilis · Accepted solution]

AcDbFace::getPlane(...) -> AcGePlane

AcDbLine -> AcGeLineSeg3d

AcGePlane::intersectWith with AcGeLineSeg3d return your point.

[majklha]

So, instead AcGeLineSeg3d I can use AcGeLine3d. Thanks.

[Alexander.Rivilis]

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@majklha wrote:

So, instead AcGeLineSeg3d I can use AcGeLine3d. Thanks.

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Yes. You can use AcGeLine3d as infinitive line.

[majklha]

But I have once more question - how do I recognize, if the interception point lies on the 3dFace (between the bordered line) or outside? Because the AcGePlanar is infinity, is not it?

[ynapeu · Accepted solution]

maybe you use AcGeBoundedPlane

[majklha]

Great advice.

[majklha]

I have found problem with AcGeBoundedPlane. It is bordered only from two sides, third is infinity. What should I do with it?

[ynapeu]

Maybe you create 2 BoundedPlane if the intersection Point lays on the 2 boundedplanes you get the intersection point.

|----------     Boundedplane 1     Boundedplane 2 |

|                                                                                     |

|                                                                      ---------|