Rescaling mesh or GameObject to fit in GUI Rect

Question

Hi guys. I've got some rectangle drawed with mouse

 Vector3 topLeft = Vector3.Min(startPosition, endPosition);
 Vector3 bottomRight = Vector3.Max(startPosition, endPosition);

 //Screen space?
 Rect rect = Rect.MinMaxRect(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);

and I'm trying to convert it into some gameobject by instantiating a prefab (basically a quad with attached mesh to it):

 Vector3 worldPoint = Camera.main.ScreenToWorldPoint(new Vector3(rect.center.x, rect.center.y, 5));
 GameObject go = (GameObject) Instantiate(prefab, worldPoint, Quaternion.identity);

It centers perfectly, but how do I resize it to fit exactly to the size of drawed rectangle?

I can't wrap my head around it. Any ideas?

Answer 1

Ok, I've figured it out. Here's a solution if anybody else will stumble upon such problem.

 Mesh mesh = go.GetComponent<MeshFilter>().mesh;
 
 Bounds bounds = mesh.bounds;
 
 //Getting xMin and yMin
 Vector3 min = new Vector3(rect.xMin, rect.yMin, 0);
 Vector3 max = new Vector3(rect.xMax, rect.yMax, 0);
             
 //Converting them to worldspace coordinates
 min = Camera.main.ScreenToWorldPoint(min);            
 max = Camera.main.ScreenToWorldPoint(max);
 
 //Calculating width/height in world space coorinate-size
 float width = max.x - min.x;
 float height = max.y - min.y;

 //Calculating scale factors
 float widthScaleFactor =  (width / bounds.size.x);
 float heightScaleFactor = (height / bounds.size.y);
 
 Vector3 localScale = go.transform.localScale;

 //Scaling object
 localScale.x *= widthScaleFactor;
 localScale.y *= heightScaleFactor;

 go.transform.localScale = localScale;

Probably not the prettiest one, but it works.

Answer 2

Answer by ElijahShadbolt · Nov 09, 2016 at 07:32 PM

Assuming the quad mesh's dimensions are 1x1 units, you could set the instantiated object's transform's scale to be the same as the Rect's width and height.

 go.transform.localScale = new Vector3(rect.width, rect.height, 1);

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VergilUa · Nov 09, 2016 at 07:36 PM 1

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It doesn't work that way, since it's a gui rect. I've already submited a working answer, but it's under moderation. T_T

Thank you for your effort

ElijahShadbolt · Nov 10, 2016 at 08:42 PM 0

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Oh yeah. I completely missed that :/

Answer 3

Answer by topitsky · Jan 03 at 04:21 PM

This works pretty well, but its off when the models origin is not a center.

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Rescaling mesh or GameObject to fit in GUI Rect

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