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C++ Triangle3D::IntersectsXYPlane方法代码示例

本文整理汇总了C++中Triangle3D::IntersectsXYPlane方法的典型用法代码示例。如果您正苦于以下问题:C++ Triangle3D::IntersectsXYPlane方法的具体用法?C++ Triangle3D::IntersectsXYPlane怎么用?C++ Triangle3D::IntersectsXYPlane使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在Triangle3D的用法示例。


在下文中一共展示了Triangle3D::IntersectsXYPlane方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: GenerateSegments

int Slice::GenerateSegments(B9ModelInstance* inputInstance)
{
    unsigned int t;
	int v1;
	int v2;
    int cmpcount = 0;//0 or 1 来指示你所寻找的点;

    QVector3D* thisvert = NULL;//局部指针进行快速访问顶点
	QVector3D* thatvert = NULL;

    std::vector<Triangle3D*>* rangedTriangles;

	double xdisp;
	double ydisp;
	double zdisp;
	double planefraction;

	int intersections = 0;


	//Triangle Splitting here:
    //Get the right container of triangles and use that as the list
    //(we used to use the triList which was O(n^2))
    rangedTriangles = inputInstance->GetTrianglesAroundZ(realAltitude);


    for(t = 0; t < rangedTriangles->size(); t++)//for each triangle in the model
	{
		//we want to create a temporary pointer to the currenct triangle
        Triangle3D* pTransTri = rangedTriangles->at(t);

		//test if the triangle intersects the XY plane of this slice!
		if(!pTransTri->IntersectsXYPlane(realAltitude))
		{
            continue;
		}
			
		intersections++;
		cmpcount = 0;
		
		//create 1 new segment object for the end result 
		Segment* seg1 = new Segment;
		QVector2D points[2];
		for(v1=0;v1<3;v1++)//for 1 or 2 triangle verts ABOVE the plane:
		{
			thisvert = &pTransTri->vertex[v1];
			if(thisvert->z() <= realAltitude)//we only want to compare FROM above the plane by convention (yes this means flush triangles below the plane)
			{
				continue;
			}
			for(v2=0; v2<3; v2++)//to every other triangle vert
			{
				if(v2 == v1)
				{continue;}

				thatvert = &pTransTri->vertex[v2];

				//are both points on the same side of plane?
				//if so we dont want to compare
				if((thatvert->z() > realAltitude))
				{
					continue;
				}
					
				cmpcount++;
				//common
				//displacments (final - initial)
				xdisp = thatvert->x() - thisvert->x();
				ydisp = thatvert->y() - thisvert->y();
				zdisp = thatvert->z() - thisvert->z();

                planefraction = (thisvert->z() - realAltitude)/fabs(zdisp);//0-1 fraction of where the plane is in relation to the z distance between the 2 verts.
				//(0 would be the plane is at the hieght of thisvert)

				points[cmpcount-1].setX(thisvert->x() + xdisp*planefraction);
				points[cmpcount-1].setY(thisvert->y() + ydisp*planefraction);
			}
		}
	
		//initiallize the segment.
		seg1->normal.setX(pTransTri->normal.x());
		seg1->normal.setY(pTransTri->normal.y());

		seg1->p1.setX(points[0].x());
		seg1->p1.setY(points[0].y());

		seg1->p2.setX(points[1].x());
		seg1->p2.setY(points[1].y());

		seg1->normal.normalize();

		seg1->CorrectPointOrder();//to match the normal convention!
			
		AddSegment(seg1);
	}
	return segmentList.size();
}
开发者ID:SHINOTECH,项目名称:B9Creator-QT5.X,代码行数:97,代码来源:slice.cpp


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