Text with fixed size in viewport

Question

Hi, i'm trying to do my Text Mesh always have the same size in the viewport. However, somet$$anonymous$$ng weird is happening. The text size change all the time, with a strange behavior. It's get bigger and than smaller, repeatedly.

My code is t$$anonymous$$s:

 void Update()
 {
 
     TextMesh textMesh = _billboard.GetComponentInC$$anonymous$$ldren<TextMesh>();
     TextBackground textBcg =_billboard.GetComponentInC$$anonymous$$ldren<TextBackground>();
             
     if(textMesh)
     {
         _targetViewportHeight = 40;
         textMesh.fontSize = 40;
         Vector3 minProjPoint = _camera.GetComponent<Camera>().WorldToScreenPoint( textMesh.collider.bounds.min );
         Vector3 upperLeftCorner = new Vector3( textMesh.collider.bounds.min.x, textMesh.collider.bounds.max.y, textMesh.collider.bounds.max.z );
         Vector3 maxProjPoint = _camera.GetComponent<Camera>().WorldToScreenPoint( upperLeftCorner );
                 
         float scaleCorrection = _targetViewportHeight / Mathf.Abs( maxProjPoint.y - minProjPoint.y );
         _billboard.transform.localScale = new Vector3( scaleCorrection,    scaleCorrection, scaleCorrection );
     }
 }

T$$anonymous$$s is what I get from my code, in play mode.

alt text

The Text Mesh get bigger and then smaller, repeatedly. I don't know how to fix t$$anonymous$$s, or what I'm doing wrong.

What seems to me (via debug tests), is that changing the scale doesn't affect the bounds. Bounds are not been update. =S

Thanks for any help.

Answer 1

Best Answer

Answer by paulaceccon · Oct 30, 2012 at 08:32 PM

Hi, I could do t$$anonymous$$s work with the following code:

 void Update ()
 {
 
     TextMesh textMesh = _billboard.GetComponentInC$$anonymous$$ldren<TextMesh>();
     TextBackground textBcg = _billboard.GetComponentInC$$anonymous$$ldren<TextBackground>();
             
     if(textMesh)
     {
         _targetViewportHeight = 40;
         Vector3 minProjPoint = _camera.GetComponent<Camera>().WorldToScreenPoint( textMesh.renderer.bounds.min );
         Vector3 upperLeftCorner = new Vector3( textMesh.renderer.bounds.min.x, 
                                         textMesh.renderer.bounds.max.y, 
                                         textMesh.renderer.bounds.max.z );
         Vector3 maxProjPoint = _camera.GetComponent<Camera>().WorldToScreenPoint( upperLeftCorner );
         
         float scaleCorrection = _targetViewportHeight / Mathf.Abs( (maxProjPoint.y - minProjPoint.y) );
                 
         _billboard.transform.localScale = new Vector3(_billboard.transform.localScale.x * scaleCorrection, _billboard.transform.localScale.y * scaleCorrection, _billboard.transform.localScale.z * scaleCorrection);
     
     }
 }

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paulaceccon · Nov 22, 2012 at 11:44 AM 0

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In others words, the problem was at the last line, cause I was not considering the previous scale.

Text with fixed size in viewport

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