VTK—— “点” “线” “面”相关示例

示例包含：

• 求两点之间的距离
• 求点到线之间的距离
• 把一个点投射到平面上
• 透视坐标转化 perspective transform 和 transform

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1. 求两点之间的距离

#include <vtkMath.h>
#include <QDebug>

int main(int, char *[])
{
    double p1[3] = {0.0, 0.0, 0.0};
    double p2[3] = {1.0, 1.0, 1.0};
    
    double squaredDistance = vtkMath::Distance2BetweenPoints(p1, p2); //两点之间的距离的平方
    double distance = sqrt(squaredDistance);
    
    qDebug() << "squaredDistance : " << squaredDistance;        //3
    qDebug() << "distance : " << distance;                      //1.73205
    
    return EXIT_SUCCESS;
}

 

2.求点到线之间的距离

#include <vtkLine.h>
#include <vtkPoints.h>
#include <QDebug>

int main(int, char *[])
{
    double lineP0[3] = {0.0, 0.0, 0.0};
    double lineP1[3] = {2.