ArcGIS Engine开发判断3D模型之间的关系

publicstatic void TestIntersection()

{

IGeometry polylineGeometry= GetPolylineGeometry();

IGeometry polygonGeometry =GetPolygonGeometry();

IRelationalOperator3DrelationalOperator3D = polylineGeometryasIRelationalOperator3D;

bool intersect =!(relationalOperator3D.Disjoint3D(polygonGeometry));

//intersect = true

}

新的IRelationalOperator3D2接口增加了IsNear3D方法，可以判断模型一定距离之内是否有其他的模型；

2、判断两个模型之间的距离可以通过IProximityOperator3D接口实现，C#示例代码返回最近的点

publicstatic void ReturnNearestPoint3D()

{

IGeometry pointGeometry= GetPointGeometry();

IGeometry envelopeGeometry =GetEnvelopeGeometry();

IProximityOperator3D proximityOperator3D = envelopeGeometry asIProximityOperator3D;

IPoint nearestPoint3D=proximityOperator3D.ReturnNearestPoint3D(pointGeometry as IPoint,esriSegmentExtension.esriNoExtension);

//nearestPoint3D = (5.393, -0.583, -6.043)

}

publicstatic void QueryNearestPoint3D()

{

IGeometrypointGeometry = GetPointGeometry();

IGeometry envelopeGeometry = GetEnvelopeGeometry();

IProximityOperator3DÂ proximityOperator3D = envelopeGeometry asIProximityOperator3D;

IPoint nearestPoint3D = new PointClass();

proximityOperator3D.QueryNearestPoint3D(pointGeometry as IPoint,esriSegmentExtension.esriNoExtension, nearestPoint3D);

//nearestPoint3D =Â (5.393, -0.583, -6.043) 

}

C#示例返回最近距离

publicstatic void ReturnDistance3D()

{

IGeometry pointGeometry= GetPointGeometry();

IGeometry envelopeGeometry =GetEnvelopeGeometry();

IProximityOperator3D proximityOperator3D = envelopeGeometry asIProximityOperator3D;

double distance3D = proximityOperator3D.ReturnDistance3D(pointGeometry);

//distance3D = 13.971

}

3、获取3D模型直接相交或者合并的部分可以通过IEnvelope3D实现；该接口实现的只是相交或合并的最大和最小范围；

C#中相交代码如下

publicstaticvoidTestIntersect3D()

{

IGeometryenvelopeGeometry1 = GetEnvelopeGeometry1();

IGeometryenvelopeGeometry2 = GetEnvelopeGeometry2();

IEnvelope3Denvelope3D = envelopeGeometry1 asIEnvelope3D;

envelope3D.Intersect3D(envelopeGeometry2asIEnvelope);

}

C#中合并代码如下

publicstaticvoidTestUnion3D()

{

IGeometryenvelopeGeometry1 = GetEnvelopeGeometry1();

IGeometryenvelopeGeometry2 = GetEnvelopeGeometry2();

IEnvelope3Denvelope3D = envelopeGeometry1 asIEnvelope3D;

envelope3D.Union3D(envelopeGeometry2asIEnvelope);

}