def GetUnprojection(winXY: QPoint, winZ: float, winWH: QPoint,
vpMat: QMatrix4x4) -> QVector3D:
#- from gluUnproject definition, I don't consider glViewport
ndcspaceCursorPos = QVector4D(
(QVector2D(winXY) / QVector2D(winWH)) * 2 - QVector2D(1, 1),
winZ * 2 - 1, 1)
invertedVpMat, success = vpMat.inverted()
if not success: raise NotImplementedError
wspaceCursorPos = invertedVpMat * ndcspaceCursorPos
return QVector3D(wspaceCursorPos) / wspaceCursorPos.w()
def _GetCamLookvecAndUpvec(
viewMat: QMatrix4x4) -> T.Tuple[QVector3D, QVector3D]:
invertedVPMat, _ = viewMat.inverted()
return invertedVPMat * dvec.lookVec, invertedVPMat * dvec.skyVec