[gameprogrammer] Re: screen to world coord conversion in OpenGL
- From: "Roman Hwang" <hwang.roman@xxxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Mon, 17 Mar 2008 23:48:52 +0200
Hello,
There is a good information in Introduction to 3D Game Programming with
DirectX 9.0 (Frank Luna), chapter 15. It's in DirectX, but math is same. So
i think you can easily write it in OpenGL
On 3/17/08, Luo Hei <luo_hei@xxxxxxxx> wrote:
>
> Alan Wolfe escribió:
>
> > If this helps, another way to do it is think of it like this.
> >
> > When you click on a point with the mouse, it covers up 1 pixel. What
> > is under the mouse could be near, or it could be far.
> >
> > So, what you do is cast a ray that follows that path from where you
> > clicked the mouse into the scene, and find the closest intersection of
> > the ray to an object that you care about.
> >
>
> Yes, but what Im looking for is for some tutorial illustrating the
> involved maths. So far I have found (I think, havent tested yet) how to
> cast the ray from near to the far clip plane. How to determine if the
> ray intersects some of the quads still escapes from my comprehension.
>
>
>
>
> --
>
> What one fool can do, another can.
> Silvanus P. Thompson
>
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--
Best Regards.
In pivo veritas.
Roman Hwang.
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