topic Betreff: intersectWith api has error, the intersect points are wrong in ObjectARX Forum

intersectWith api has error, the intersect points are wrong

475867377 — Thu, 29 Feb 2024 02:43:09 GMT

a ray intersectWith a polyline,get three intersect points.but one point is wrong .it is not intersct point in fact. i use red line to join the three point.i have marked the three point "1,2,3". the third point is not intersect with polyline in fact.there are only two intersect points in fact. the following are the code. pts_intesect and pts_intesect2 are the same result.

AcGePoint3d pttemp = AcGePoint3d(ptc.x + drad*cos(dang),ptc.y+ drad*sin(dang),ptc.z);

AcDbRay* pray = new AcDbRay();

pray->setBasePoint(pttemp);

pray->setUnitDir(rayvec);

AcGePoint3dArray pts_intesect;

vector<AcGePoint3d> vec1;

err = polyLine->intersectWith(pray, AcDb::kExtendArg, pts_intesect);

for each (AcGePoint3d var in pts_intesect)

{

vec1.push_back(var);

}

AcGePoint3dArray pts_intesect2;

vector<AcGePoint3d> vec2;

err = pray->intersectWith(polyLine, AcDb::kExtendThis, pts_intesect2);

for each (AcGePoint3d var in pts_intesect2)

{

vec2.push_back(var);

}

delete pray;

Betreff: intersectWith api has error, the intersect points are wrong

ynapeu — Mon, 08 Apr 2024 14:42:13 GMT

I think you should use, AcDb::kOnBothOperands

AcDb::kOnBothOperands

Do not extend either entity. This results in only calculating intersections where the two entity's geometry actually intersect

Re: intersectWith api has error, the intersect points are wrong

tbrammer — Wed, 17 Apr 2024 08:08:22 GMT

I tried to reproduce your observation. But the provided code is not sufficient.

Please provide values for ptc, drad, dang and rayvec and either a DWG with a polyline that can be used for polyline or code to create it.