空间坐标和屏幕坐标相互换

d3d中操作

可以用D3DXVec3Project从3D坐标转换到屏幕坐标 同时可以用D3DXVec3UnProject将屏幕坐标转换成3D坐标！

 

gl里的操作

CPoint D3DToScreen2D(CPoint3d pt3D ,/     const GLdouble modelMatrix[16], const GLdouble projMatrix[16], const GLint viewport[4]){ GLdouble x,y,z;

 gluProject( pt3D.x, pt3D.y, pt3D.z,   modelMatrix, projMatrix, viewport,   &x, &y, &z); CPoint ptOut; ptOut.x = int(x); ptOut.y = viewport[3]-int(y);

 return ptOut;}

应用:

CPoint CCityPlanView::GetPoint3DTo2D(CPoint3d pt3D){ GLdouble    modelview[16]; GLdouble    projection[16]; GLint       viewport[4]; wglMakeCurrent(m_hDC,m_hRC); glGetDoublev (GL_MODELVIEW_MATRIX, modelview); glGetDoublev (GL_PROJECTION_MATRIX, projection); glGetIntegerv (GL_VIEWPORT, viewport);

 CPoint ptOut = D3DToScreen2D(pt3D,modelview,projection,viewport);

 wglMakeCurrent(m_hDC,NULL); return ptOut;}

 

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