Free X/Y movement while on a Z axis rail

Question

I've been working on prototyping a star fox like movement system where the player only controls the x and y movements of a ship within a set boundary while the ship moves along a set path. I currently have a ship the moves in one direction while the player can control its position on screen. Where I'm having issues is how I would go about getting this whole rig to move on a preset path. I have no doubt that I could solve this in some complicated round-about manner but I wanted to know if there is some straight forward solution that could save me a lot of wasted time. Any hint or push in the right direction would be great. Thanks.

Answer 1

Best Answer

Answer by hathol · Jun 20, 2012 at 06:50 PM

Essentially: use the transforms local axes to do the translation and use your path to determine the orientation. Something like

 //get your offset direction
 Vector3 direction = Vector3.zero;
 if(goRight)
     direction += transform.right;
 else if(goLeft)
     direction += -transform.right;
 if(goUp)
     direction += transform.up;
 else if(goDown)
     direction += -transform.up;

 //add your forward movement
 Vector3 zDirection = (Vector3)nextPositionOnPath - (Vector3)currentPositionOnPath;
 direction += zDirection.normalized;

 transform.position = transform.position + direction*speed*Time.deltaTime;
 transform.rotation = Quaternion.LookRotation(zDirection);

Just add your boundary check in there. It's not a final solution but it should get you started

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Free X/Y movement while on a Z axis rail

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