title: Transform screen coordinates to model coordinates
body: <p>I've got some sort of newbie question.</p>
  
  <p>In my application (processingjs) i use scale() and translate() to allow the user to zoom and scroll through the scene. As long as i keep the scale set to 1.0 i've got no issues. BUT whenever i use the scale (i.e. scale(0.5)) i'm lost...</p>
  
  <p>I need the mouseX and mouseY translated to the scene coordinates, which i use to determine the mouseOver state of the object I draw on the scene.</p>
  
  <p>Can anybody help me how to translate these coordinates?
  Thanks in advance!
  /Richard</p>