FreeLookCamera WASD movement

Dear colleagues

I am working on camera system for my building game. I use a free look camera and everything is going fine, except the WASD movement of the camera. I am not sure how to solve it.

As you can see on the picture, the camera moves from a top down view until to a very near at the bottom view. Works just fine by the mouse wheel.

Now i want to move the camera with WASD. Curently i am using the offset for this. In the very top position this works just fine, but in all other position the offset follows the angle off the camera. I would like to move the camera always in the same direction in relation to the screen like in the green boxes.

How can I achieve this?

Code (CSharp):

1. private void CameraMovement()
2.     {
3.         Vector3 currentOffset = myOffset.m_Offset;
4.  
5.         // Move Camera Horizontal
6.         myOffset.m_Offset.x = currentOffset.x += Input.GetAxis("Horizontal");
7.  
8.         // Move Camera Vertical
9.         myOffset.m_Offset.y = currentOffset.y += Input.GetAxis("Vertical");
10.     }

I know it's a long post. I hope somebody can help. Thank you.

 

Ok, getting no answer so far. May be another view on the problem. What would be y(offset)?

 

Sorry it's hard to describe.

If I use the free look camera, which is setup to like above. When I change the value of the y-axis or the x axis the camera rotates with it to look on the target. I would like to have a dimension where the x and y axis are not rotating with the camera. For this I used the offset, but may be this is the wrong way.

 

I already prototyped this. I remember there was some strange behavior with the "aim to" behavior. But may be I have to have a look on that again. I will try and let you know if it works.