如何用鼠标获得三维空间中某一点的坐标？

yourpink333

谢谢

♂樱♀

First of all you should fetch z value from depth buffer via a function call glReadPixel. Z value will be provide as a parameter passing to gluUnProject(Sorry for my missing spelling ) ,the return value of UnProject functions call will be the data you need.

z16304607

DX9中有个picking 的例子

XophiiX

CVector3 GetOGLPos(int x, int y)
{
        GLint viewport[4];
        GLdouble modelview[16];
        GLdouble projection[16];
        GLfloat winX, winY, winZ;
        GLdouble posX, posY, posZ;

        glGetDoublev( GL_MODELVIEW_MATRIX, modelview );
        glGetDoublev( GL_PROJECTION_MATRIX, projection );
        glGetIntegerv( GL_VIEWPORT, viewport );

        winX = (float)x;
        winY = (float)viewport[3] - (float)y;
        glReadPixels( x, int(winY), 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &winZ );

        gluUnProject( winX, winY, winZ, modelview, projection, viewport, &posX, &posY, &posZ);

        return CVector3(posX, posY, posZ);
}

from nehe.gamedev.net

gywolf

那位大侠肯赐教一下  小弟 在学OpenGL  qq 382074137  谢谢