[maxmsp] Re: Typographical Teaser

Coordinates in OpenGL originate in the centre point of your drawing  
context, going 1 unit to the borders of the drawing area (on the zero  
plane, where your z position = 0). That means that the visible area  
(on the zero plane) is 2 units wide and high with the origin at its  
centre. That said, converting pixels to GLworld is then straight  
forward: xGL = xPixel/widthPixel * 2 - 1 and respectively for y.

c


On 29 Jan 2008, at 23:23, Leafcutter John wrote:

>
> I have decided to go with jitter to display my floating words but  
> i'm having a problem due to my lack of knowledge in this area.
>
> I'm using jit.gl.text2d to render the words and trying to move them  
> round the jit.pwindow in response to mousedown in the same window.  
> The problem is that the jit.pwindow spits out pixel coordinates  
> like LCD but the jit.gl.text2d objects want a float number as  
> position input. The number seems to be some sort of scaled value  
> related to the size of the jit.pwindow but i cant seem to figure  
> out the relationship - Anyone know??
>
> Thnaks,
>
> John.
> --
> http://www.leafcutterjohn.com
>
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