Open Inventor练习-SoSelection三维场景中查找功能
在三维场景中查找是一个常用的操作，这里演示了Open Inventor实现查找的操作方法和过程，SoSearchAction是Open Inventor用来实现查找的节点，这里利用它在场景中的两个球体中查找红色的那个，并在控制台中输出查找结果。代码如下。
#define COIN_DLL
#define SOWIN_DLL
// 加载COIN库文件
#ifdef _DEBUG
#pragma comment(lib, "SoWin1d.lib")
#pragma comment(lib, "Coin3d.lib")
#else
#pragma comment(lib, "SoWin1.lib")
#pragma comment(lib, "Coin3.lib")
#endif
// 添加COIN头文件-Window操作显示库和节点库
#include <Inventor/Win/viewers/SoWinExaminerViewer.h>
#include <Inventor/Win/SoWin.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoSphere.h>
#include <Inventor/nodes/SoMaterial.h>
#include <Inventor/actions/SoSearchAction.h>
int main (int argc, char ** argv)
{
if (argc != 2) {
fprintf(stderr, "Usage: %s <file.iv>\n", argv[0]);
exit(1);
}
// Initialize Coin & SoWin
HWND win = SoWin::init(argv[0]);
if (win == NULL) exit(1);
// Read scene graph from file
SoInput in;
if (!in.openFile(argv[1])) {
fprintf(stderr, "Unable to open file \"%s\"\n",argv[1]);
exit(1);
}
SoSeparator *root = SoDB::readAll(&in);
in.closeFile();
root->ref();
SoSearchAction sa;
SoPath *path;
sa.setType(SoSphere::getClassTypeId());
sa.setInterest(SoSearchAction::FIRST);
sa.apply(root);
path = sa.getPath();
if (path != NULL)
{
SoSphere *s = (SoSphere *)path->getTail();
printf("Sphere found: %s (radius=%.2f)\n",
s->getName().getString(),
s->radius.getValue());
}
// Create the viewer
SoWinExaminerViewer * v = new SoWinExaminerViewer(win);
v->setSceneGraph(root);
v->setTitle("search action example");
// Show the window
v->show();
SoWin::show(win);
// Enter the application event loop
SoWin::mainLoop();
// Free scene graph memory
root->unref();
return 0;
}
IV文件如下
#Inventor V2.1 ascii Separator { DEF s Sphere { radius 0.5 } Separator { Transform { translation 0.9 0.5 0 scaleFactor 0.4 0.4 0.4 } Material { diffuseColor 1 0 0 } USE s } } 演示效果如下