Rob,
I’ve written some classes that implement RTT and post-filtering using OSG and GLSL shaders. Let me know if interested. I thought about putting in Wiki when I get time. You can take the output of one RTT stage and apply it as an input to the next stage … ganging them together … allowing as many filters as needed (e.g. for creating a night vision scene … RTT of main scene -> color amplification stage -> bright pass stage -> horizontal Gauss blurring -> vertical Gauss blurring -> composition with original RTT of main stage -> noise -> change of resolution). The technique is from an idea of one of the users on Delta3D forum. Cheers, Ben _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert Hansford Sent: Wednesday, December 19, 2007 3:26 PM To: osg-users@lists.openscenegraph.org Subject: [osg-users] osgFX and RTT? Hi all, For one of the projects I'm working on I need to have several render passes which operate on the rendered scene as a texture. I was wondering if I could base the implementations on the osgFX::Effect class. I know the existing effects are all based around simply using different statesets, but would it be an inappropriate use of the Effect class to write Techniques which contain a render-to-texture camera and then operate on that texture? A few examples of the sort of thing I'm doing are as follows: 1) blurring the image using a Gaussian kernel. 2) computing the min and max pixel value in the image in order to "downgrade" HDR imagery to get the expected effects when an unusually bright object appears in the field of view. 3) adding noise to the image to simulate a poor quality camera. I am a little concerned that this may not be a proper use for the Effect class as this sort of process probably has to be done at the root of the scene graph, where as the existing effects can be applied to any subgraph. However, I do like the idea of implementing these processes as nodes in the graph that can be saved out to .osg files etc, but I can probably achieve this by writing my own class rather than extending Effect (though that would take me more time). I would greatly appreciate hearing people's thoughts on this matter. Thanks in advance, Rob. No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.17.5/1190 - Release Date: 12/19/2007 7:37 PM
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