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FLT, LODs and Light Points


 
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Chris Hanson
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PostPosted: Thu Jun 21, 2012 1:25 am    Post subject:
FLT, LODs and Light Points
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On Wed, Jun 20, 2012 at 10:49 AM, Paul Martz < (
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Hi Chris -- About 5 years back, I was doing quite a bit of work with FLT light points in OSG and don't recall ever encountering an issue with near/far computation. If there is an issue with it, it's new since I last tinkered with this feature.



  While the issue hasn't been totally nailed down, it now seems to have to do with pre-set ranges in the TXP file that was loading the FLT models of structures. It is unclear why light points made any difference, but I think they were a red herring. 



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Chris 'Xenon' Hanson, omo sanza lettere. http://www.alphapixel.com/
Training • Consulting • Contracting
3D • Scene Graphs (Open Scene Graph/OSG) • OpenGL 2 • OpenGL 3 • OpenGL 4 • GLSL • OpenGL ES 1 • OpenGL ES 2 • OpenCL
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Chris Hanson
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PostPosted: Thu Jun 21, 2012 1:34 am    Post subject:
FLT, LODs and Light Points
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  Had someone consult with me off-list about an issue involving near/far computation that boiled down to an issue occurring when certain models are paged into the OSG scene. The user is fairy certain the issue arises when multiple LODs and Light Points are present in a FLT file. I suspect that this is a red herring and that the actual cause is more subtle, but perhaps MANIFESTS in a way that appears like this is the cause. Just on the off chance though, I figured I'd put out a call for knowledge or insight about whether anyone else had seen anything fishy happening in FLT files with Light Points messing up the automatic near/far computation.


  I expect to get sample data to dissect in the next week or so, but I figured I'd put out a ping now in case there was some issue others were aware of that I should be on the look out for.


--
Chris 'Xenon' Hanson, omo sanza lettere. http://www.alphapixel.com/
Training • Consulting • Contracting
3D • Scene Graphs (Open Scene Graph/OSG) • OpenGL 2 • OpenGL 3 • OpenGL 4 • GLSL • OpenGL ES 1 • OpenGL ES 2 • OpenCL
Digital Imaging • GIS • GPS • Telemetry • Cryptography • Digital Audio • LIDAR • Kinect • Embedded • Mobile • iPhone/iPad/iOS • Android

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Paul Martz
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PostPosted: Thu Jun 21, 2012 3:08 am    Post subject:
FLT, LODs and Light Points
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Hi Chris -- About 5 years back, I was doing quite a bit of work with FLT light
points in OSG and don't recall ever encountering an issue with near/far
computation. If there is an issue with it, it's new since I last tinkered with
this feature.
-Paul


On 6/18/2012 3:55 PM, Chris Hanson wrote:
Quote:
Had someone consult with me off-list about an issue involving near/far
computation that boiled down to an issue occurring when certain models are paged
into the OSG scene. The user is fairy certain the issue arises when multiple
LODs and Light Points are present in a FLT file. I suspect that this is a red
herring and that the actual cause is more subtle, but perhaps MANIFESTS in a way
that appears like this is the cause. Just on the off chance though, I figured
I'd put out a call for knowledge or insight about whether anyone else had seen
anything fishy happening in FLT files with Light Points messing up the automatic
near/far computation.

I expect to get sample data to dissect in the next week or so, but I figured
I'd put out a ping now in case there was some issue others were aware of that I
should be on the look out for.

--
Chris 'Xenon' Hanson, omo sanza lettere.
http://www.alphapixel.com/
Training • Consulting • Contracting
3D • Scene Graphs (Open Scene Graph/OSG) • OpenGL 2 • OpenGL 3 • OpenGL 4 • GLSL
• OpenGL ES 1 • OpenGL ES 2 • OpenCL
Digital Imaging • GIS • GPS • Telemetry • Cryptography • Digital Audio • LIDAR •
Kinect • Embedded • Mobile • iPhone/iPad/iOS • Android






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