On Tue, 30 Oct 2012 23:56:30 +0000, VelociChicken wrote:It's easier to just keep an unprojected copy, i.e. as well as:
>> Also, it's not linear, it's reciprocal; specifically: a+(b/z), where a and
>> b are such that the near and far planes map to -1 and +1 respectively.
> So I can't get the real distance to a point without 'unprojecting' it?
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
(or similar), add:
position = gl_ModelViewMatrix * gl_Vertex;
In theory, it's possible to reconstruct the latter from gl_FragCoord,
If you do want to reconstruct it from gl_FragCoord, gl_FragCoord.w is the
So, for the standard gluPerspective() matrix:
nx = 2 * (gl_FragCoord.x - viewport_x) / viewport_width - 1;
Note that zNear and zFar aren't relevant, as we're using gl_FragCoord.w
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