移动相机gluLookAt

Question

With this instruction gluLookAt:

gluLookAt( p1, p2, p3, l1, l2, l3, u1, u2, u3 );

How can I move the camera one unit to the left, keeping the direction of looking at the same point?

Apparently i cant just do p1-1, because its moving 1 in the global space, but i need to move the camera in the camera space, just with the information of the instruction above.

A found in a search that i could found the right vector and do this:

right = u * dir (normalized)

p = p - right
l = l - right

But i cant understand why or even if this works...

Answer 1

You have to decrement p1 and l1.

p specifies the position of the eye point and l the position of the reference point.

Answer 2

如果要修改摄像机的位置，则应使用目标的坐标进行相同的更改。

Answer 3

您的问题是否与向左顺时针方向绕y轴旋转的问题相同？