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Question by Fatism · Dec 24, 2014 at 11:41 AM · zoom

exponential zoom in / out

Hi,

I'm working on a project for demoing a city model.

I'm using a flyover camera thats controlled by the mouse. Scrollwheel is zooming.

However the problem I run in to when calculating the exponential zoom in value is that it works when I'm reaching min height, but it multiplies whenever I reach the max height.

I've got a few variables:

  • PlayerHeight (float)

  • ZoomValue (float)

  • MaxHeight (float)

  • MinHeight (float)

So what I need is for ZoomValue to be 1 when PlayerHeight is MaxHeight / 2, and ZoomValue to be 0 when at MaxHeight or MinHeight, and everything in between. I guess it's a simple formula but I can't figure it out.

MinHeight 0f and MaxHeight is 650f.

Just for reference here's a table I quickly drew illustrating what I need:

alt text

Can anyone help me out? Thanks!

zoomvalue table.jpg (102.0 kB)
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Answer by CodeElemental · Dec 24, 2014 at 12:08 PM

From the sample values you have provided it's more like a linear formula.

 int maxHeight = 650;
 int minHeight = 0;
 int maxZoom = 1f;
 int playerHeight;
 
 void Update()
 {
    playerHeight = 200; // set playerHeight accordingly.
 }

 private int CalucalteZoom()
 {
   if ((playerHeight > minHeight) && (playerHeight < (maxHeight / 2))) 
   {
     return ((playerHeight * maxZoom)/ (maxHeight / 2));
   } else if ((playerHeight > (maxHeight / 2)) && playerHeight < maxHeight)
   {
     return (((maxHeight - playerHeight) * maxZoom) / (maxHeight / 2));
   } else 
      return 0;
 }
 




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avatar image Fatism · Dec 24, 2014 at 02:06 PM 0
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Thanks! I got it to work :D

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