[osg-users] depth buffer -> real pixel z - depth

zarrandreas zarrandreas at web.de
Mon Sep 17 09:30:50 PDT 2007


Thanks for your answer, but how do you mean this?

Real_depth = inverseProjectionMatrix * [0.0, 0.0, depth, 1.0]

Is that correct?

-----Original Message-----
From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Robert
Osfield
Sent: Monday, September 17, 2007 10:29 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] depth buffer -> real pixel z - depth

On 9/16/07, zarrandreas <zarrandreas at web.de> wrote:
> Hi,
>
> I render depth buffer to the image, but values I have there are between
> [0.0, 1.0].
>
> How can I get real z-depth?

You'll need to use the inverse of the projection matrix.
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