Hello,
I'm trying to implement a mesh viewer using the Qt3D framework and I cannot
find a way get the "3D position" of the mouse cursor by picking the depth
buffer.
How can I do something like this?:
/// get 3d world point from clicked position
QVector3D Forensic3DWindow::getMouse3DPoint(const QPoint& point2d)
{
float depth = 1;
float x = point2d.x();
float y = height() - 1 - point2d.y();
glReadPixels(x, y , 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &depth);
if (depth < 1)
{
int viewport[4];
glGetIntegerv(GL_VIEWPORT, viewport);
// the following does the same as gluUnProject:
QVector3D point = QVector3D(2 * (x - viewport[0]) / viewport[2] - 1, 2
* (height() - 1 - y - viewport[1]) / viewport[3] - 1, 2 *
depth - 1);
QMatrix4x4 world = camera()->projectionMatrix() *
camera()->viewMatrix();
return world.inverted().map(point);
}
return QVector3D();
}
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