Camera view bounded by mesh map area?

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I have created a map made of meshes sorted like a puzzle all correctly lined up and each mesh fits perfect next to each other. All together it forms a perfect rectangular map, each mesh is a scale of 100. I have a camera set to Ortho with a size of 300, I have set up camera controls to pan across the map and zoom controls to change size from 300-200. It all works perfectly. However… I can pan way past the map end, I want to prevent this.

What is the relationship between camera coordinates and its size?
Can I determine the total map size by measuring the border mesh lengths?
Can I use those measurements to clamp the camera coordinates in relation to its zoom?

I done some testing… for instance camera of size 300 needs to be clamped between 600 and -600 on x. If the camera is a size 200 (zoomed in) it needs to be clamped between 768 and -768 on x. I need to know some equation that can clamp the camera on any size between 300 and 200. Is there some relationship value I am not aware of?

1 Answer

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Yes: an InverseLerp inside a Lerp.

var maxX : float = 768;
var minX : float = 600;
var maxCamSize : float = 300;
var minCamSize : float = 200;
var clampX : float;
var camSize : float;

clampX = Mathf.Lerp (minX, maxX, Mathf.InverseLerp (minCamSize, maxCamSize, camSize) );

if clampX is used for the x coordidate of the camera position it just stays fxd at 768, besides, the camera needs to move between -600 and 600 at 300 size, and -768 and 768 at 200 size. There needs to be a way to find the correct clamp values for any size between 300 and 200....

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That's probably because you never changed the value of camSize. Did you? The Lerp and InverseLerp approach will work, but GIGO. I didn't say what to do with the clampX variable after you get a value for it because I thought you already had that part figured out. But it goes something like this: if (Mathf.Abs (camT.position.x) > clampX) { camT.position.x = Mathf.Clamp (camT.position.x, (-1*clampX), clampX); }

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