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但这个求坐标的x,y,z和lookat的右手坐标系不太一样，需要调换一下x,y,z顺序。
单独控制lookat的左右，和上下比较容易，合在一起遇到了些问题，主要是涉及到了球坐标。
当按下鼠标时记录当前点坐标。
mousePoint.push(mousePressPosition);
当移动鼠标时计算移动差
mouseCurPosition = QVector2D(e->localPos());
QVector2D offset;
if (mousePoint.size() == 1){
QVector2D mouseLastPosition = mousePoint.top();
offset = mouseCurPosition -mouseLastPosition ;
offset.setX(-offset.x());//由于方向问题，这里取反
}
每一次鼠标按下，都重新计算当前俯仰角
curPitch = 0;
curYaw = 0;
float camX = 0;
float camY = 0;
float camZ = 0;
//球坐标的计算,先计算球坐标夹角
curYaw = qAcos(offset.y()/5000 / radius );
curYaw = qRadiansToDegrees(curYaw);
//把求坐标的角度转换为笛卡尔坐标，即俯仰角
curYaw = 90 -curYaw;
//通过俯仰角计算偏航角
curPitch = qAsin(offset.x() / (radius * qCos(curYaw)) / 5000 );
curPitch = qRadiansToDegrees(curPitch);
//球坐标系中的x y z
camX = radius * qCos(lastYaw + curYaw)* qSin(lastPitch + curPitch) ;
camY = radius * qSin(lastYaw + curYaw);
camZ = radius * qCos(lastYaw + curYaw)* qCos(lastPitch + curPitch) ;
camPos.setX(camX);
camPos.setY(camY);
camPos.setZ(camZ);
当鼠标抬起，记录上一次俯角，仰角，一遍下一次顺畅使用
if (mousePoint.size() == 1)
mousePoint.pop();
lastPitch += curPitch;
lastYaw += curYaw;
lookat属性设置
QVector3D Pos(0, 0, 5); //pos
QVector3D Front(0, 0, 0); //target
QVector3D Up(0, 1, 0); //up direction
matrix.lookAt(camPos, camFront, camUp);
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