Re: [osg-users] Retrieving Z-Near Far per-frame
Well, I want to do it "in"
the frame.. Basically, I'm hoping to get OSG to do the scene traversal
for culling, etc, then read the znear/zfar values to be sent elsewhere
while the geometry is pushed down the pipe. I don't need perfectly
accurate znear/far, just the bounding box estimates.
Trajce Nikolov NICK
March 24, 2013
4:05 PM
Hi Randal,it
is easy . somewhere in the loop, probably after the frame all you
have to do is to get the projection matrix likewhile
(!viewer.done()){viewer.frame();
viewer.getCamera()-getProjectionMatrixAsFrustum(arguments )-- trajce nikolov nick
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Randall Hand
March 23, 2013
10:41 PM
Is there (I'm sure there is) a
way to retrieve the autocalculated ZNear
ZFar from the scene graph on a per-frame basis? I figure it's
somewhere in a traversal structure, but I'm not exactly sure where or
how to get to it.
Can someone enlighten me?
-- Randall Hand
www.yeraze.com
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Re: [osg-users] Retrieving Z-Near Far per-frame
Hi Randall, On 29 March 2013 14:18, Randall Hand randall.h...@gmail.com wrote: Well, I want to do it in the frame.. Basically, I'm hoping to get OSG to do the scene traversal for culling, etc, then read the znear/zfar values to be sent elsewhere while the geometry is pushed down the pipe. I don't need perfectly accurate znear/far, just the bounding box estimates. The CullVisitor computes and maintains the near/far values when these need computing. Have a look at osgUtil::CullVisitor. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving Z-Near Far per-frame
I'm currently using the
viewer.getCamera()-setUpdateCallback() to assigna custom callback
that does stuff on a per-frame basis. Is it safe to retrieve the
camera-getRenderer()-getSceneView(0)-getCullVisitor()-getCalculatedNear/FarPlane()
? are those values valid and available at that point?
Robert Osfield
March 29, 2013
9:35 AM
Hi Randall,The
CullVisitor computes and maintains the near/far values when these need
computing. Have a look at osgUtil::CullVisitor.
Robert.
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Randall Hand
March 29, 2013
9:18 AM
Well, I want to do it "in"
the frame.. Basically, I'm hoping to get OSG to do the scene traversal
for culling, etc, then read the znear/zfar values to be sent elsewhere
while the geometry is pushed down the pipe. I don't need perfectly
accurate znear/far, just the bounding box estimates.
Trajce Nikolov NICK
March 24, 2013
4:05 PM
Hi Randal,it
is easy . somewhere in the loop, probably after the frame all you
have to do is to get the projection matrix likewhile
(!viewer.done()){viewer.frame();
viewer.getCamera()-getProjectionMatrixAsFrustum(arguments )-- trajce nikolov nick
___osg-users
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Randall Hand
March 23, 2013
10:41 PM
Is there (I'm sure there is) a
way to retrieve the autocalculated ZNear
ZFar from the scene graph on a per-frame basis? I figure it's
somewhere in a traversal structure, but I'm not exactly sure where or
how to get to it.
Can someone enlighten me?
-- Randall Hand
www.yeraze.com
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Re: [osg-users] Retrieving Z-Near Far per-frame
Hi Randall, On 29 March 2013 14:55, Randall Hand randall.h...@gmail.com wrote: I'm currently using the viewer.getCamera()-setUpdateCallback() to assigna custom callback that does stuff on a per-frame basis. Is it safe to retrieve the camera-getRenderer()-getSceneView(0)-getCullVisitor()-getCalculatedNear/FarPlane() ? are those values valid and available at that point? These will be valid for the previous frame as the cull traversal happens after the update traversal. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving Z-Near Far per-frame
So... I need to attach
instead to setCullCallback?
I'm looking in ViewerBase and I see the order is event, update,
rendering, and Rendering calls "renderer-cull()". I need to be
after a completed cull, but before rendering actually starts (or at
least as early into rendering as I can get). Could/should I register
what I want as a custom "operation"? Or is this the job of the Camera's
PreDrawCallback?
Basic requirements:
* Run once per frame (in a system with multiple viewers contexts
per frame)
* After Cull (so I have a valid znear/zfar estimate for the frame), but
before/during the Render
* I will not be modifying the scenegraph, only reading data
shipping it elsewhere
Robert Osfield
March 29, 2013
10:09 AM
Hi Randall,These
will be valid for the previous frame as the cull traversal happens after
the update traversal.
Robert.
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Randall Hand
March 29, 2013
9:55 AM
I'm currently using the
viewer.getCamera()-setUpdateCallback() to assigna custom callback
that does stuff on a per-frame basis. Is it safe to retrieve the
camera-getRenderer()-getSceneView(0)-getCullVisitor()-getCalculatedNear/FarPlane()
? are those values valid and available at that point?
Robert Osfield
March 29, 2013
9:35 AM
Hi Randall,The
CullVisitor computes and maintains the near/far values when these need
computing. Have a look at osgUtil::CullVisitor.
Robert.
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Randall Hand
March 29, 2013
9:18 AM
Well, I want to do it "in"
the frame.. Basically, I'm hoping to get OSG to do the scene traversal
for culling, etc, then read the znear/zfar values to be sent elsewhere
while the geometry is pushed down the pipe. I don't need perfectly
accurate znear/far, just the bounding box estimates.
Trajce Nikolov NICK
March 24, 2013
4:05 PM
Hi Randal,it
is easy . somewhere in the loop, probably after the frame all you
have to do is to get the projection matrix likewhile
(!viewer.done()){viewer.frame();
viewer.getCamera()-getProjectionMatrixAsFrustum(arguments )-- trajce nikolov nick
___osg-users
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-- Randall Hand
www.yeraze.com
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Re: [osg-users] Retrieving Z-Near Far per-frame
Hi Randal,
it is easy . somewhere in the loop, probably after the frame all you
have to do is to get the projection matrix like
while (!viewer.done())
{
viewer.frame();
viewer.getCamera()-getProjectionMatrixAsFrustum(arguments )
On Sun, Mar 24, 2013 at 4:41 AM, Randall Hand randall.h...@gmail.comwrote:
Is there (I'm sure there is) a way to retrieve the autocalculated ZNear
ZFar from the scene graph on a per-frame basis? I figure it's somewhere in
a traversal structure, but I'm not exactly sure where or how to get to it.
Can someone enlighten me?
__**_
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osg-users@lists.**openscenegraph.org osg-users@lists.openscenegraph.org
http://lists.openscenegraph.**org/listinfo.cgi/osg-users-**
openscenegraph.orghttp://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
--
trajce nikolov nick
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Re: [osg-users] Retrieving Z-Near Far per-frame
You might take a look at the osgthirdpersonview example, which draws two views of the same scene, one of which contains a wireframe representation of the view frustum used for the other view. On Sat, Mar 23, 2013 at 9:41 PM, Randall Hand randall.h...@gmail.comwrote: Is there (I'm sure there is) a way to retrieve the autocalculated ZNear ZFar from the scene graph on a per-frame basis? I figure it's somewhere in a traversal structure, but I'm not exactly sure where or how to get to it. Can someone enlighten me? __**_ osg-users mailing list osg-users@lists.**openscenegraph.org osg-users@lists.openscenegraph.org http://lists.openscenegraph.**org/listinfo.cgi/osg-users-** openscenegraph.orghttp://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Paul Martz Skew Matrix Software LLC ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Retrieving Z-Near Far per-frame
Is there (I'm sure there is) a way to retrieve the autocalculated ZNear ZFar from the scene graph on a per-frame basis? I figure it's somewhere in a traversal structure, but I'm not exactly sure where or how to get to it. Can someone enlighten me? ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
