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Question by smjackal · Aug 01, 2012 at 05:59 PM · transform.position

Position gameobjects accurately relative to parent

Hi,

I have json data of text word positions provided in pixel coordinates (screen space). I need to generate clickable words and position these above a gameobject with texture containing the original text. The clickable gameobjects need to allign perfectly with the words in the texture applied to the gameobject. The co-ordinates are derived from the text positions in the texture.

So far I have done the following:

  1. Created vectors of screen x , y coords and converted to world positions.

  2. Converted the world coords to local

  3. Created a gameobject per word

  4. Parented the word gameobject to the page texture gameobject

  5. positioned the word gameobject using the local position calculated in step 2.

using these steps I'm not able to accurately position each word relative to the parent page Gameobject based on the word pixel co-ordinates. I would be grateful for any suggestions.

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Answer by DaveA · Aug 01, 2012 at 09:47 PM

Beware of Z positioning. You may want to use and orthogonal camera. What I suspect (aside from possible math errors, can you post your code?) is camera perspective causing a visual 'shift'

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avatar image smjackal · Aug 02, 2012 at 11:10 AM 0
Share
 Yes an orthogonal camera helped - but it seems that the conversions between coordinate systems is not working as expected. I think it's to do with my original data. I'm receiving word coordinates as pt coordinates which I am converting from latex values 1/72 inch (/65535 ). I suspect I may have to convert these point values to pixel values by finding out the dpi value of the screen.  

The problem comes down to transfor$$anonymous$$g pts to pixels to local coordinates so I can position relative to a parent rectangle, but I am struggling to do this. The code I'm using for the coordinate conversion is below.

Thanks for your help.

 foreach (PageLinks link in l) { 
  textplaceholder = (GameObject)Instantiate
                                 (Resources.Load ("text$$anonymous$$arker")); 
  
  textplaceholder.gameObject.transform.parent = book.gameObject.transform;
  int startx = link.startx;
     
  Vector3 linkPos = new Vector3(startx,1.0f,starty); 
  
  Vector3 worldPos = Camera.main.ScreenToWorldPoint(linkPos);
     
 
   textplaceholder.transform.localPosition =  
                                  book.gameObject.transform.InverseTransformPoint(worldPos);
 }

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