Re: [osg-users] Dynamically change the persistence of the motion blur example
Hi Bill,
Is there any reason why you could retain a ref_ptr to the Operation and
modify it in your frame loop, or get the list of operations and use a
dynamic_castMotionBlurOperation*() to determine which one is the one you
need to modify?
Robert.
On 16 May 2013 23:15, William Hart bill.h...@utas.edu.au wrote:
Hi,
I've been using the Accumulation buffer to apply motion blur to point
cloud animations, directly taken from the osgMotionBlur example, where the
motion blur is applied to each window as an osg::Operation. What I'd like
to be able to do is dynamically change the amount of blur by varying the
persistence parameter. I've poked around the API and found that I can
remove the motion blur operation with a removeAllOperations call then
reapply the motion blur with a different persistence value, but this causes
the accumulation buffer to be cleared. I can't see any other way to access
the Operator once its been applied.
Below is the code,
#include osgViewer/ViewerBase
#include osgViewer/Viewer
#include iostream
class MotionBlurOperation: public osg::Operation
{
public:
MotionBlurOperation(double persistence):
osg::Operation(MotionBlur,true),
cleared_(false),
persistence_(persistence)
{
}
virtual void operator () (osg::Object* object)
{
osg::GraphicsContext* gc =
dynamic_castosg::GraphicsContext*(object);
if (!gc) return;
double t = gc-getState()-getFrameStamp()-getSimulationTime();
if (!cleared_)
{
// clear the accumulation buffer
glClearColor(0, 0, 0, 0);
glClear(GL_ACCUM_BUFFER_BIT);
cleared_ = true;
t0_ = t;
}
double dt = fabs(t - t0_);
t0_ = t;
// compute the blur factor
double s = powf(0.2, dt / persistence_);
// scale, accumulate and return
glAccum(GL_MULT, s);
glAccum(GL_ACCUM, 1 - s);
glAccum(GL_RETURN, 1.0f);
}
private:
bool cleared_;
double t0_;
double persistence_;
};
void motionblur(osgViewer::GraphicsWindow* w, double persistence) {
w-add(new MotionBlurOperation(persistence));
}
any ideas ?
thanks in advance
Bill
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Re: [osg-users] [build] Building OpenThreads on Windows
Hi, OpenThreads is also part of the OpenSceneGraph trunk, you can download it and it builds for many known platforms including Windows without problems Nick On Fri, May 17, 2013 at 7:49 AM, Nav Joseph nk...@tatapowersed.com wrote: How does one build OpenThreads library standalone on Windows? Downloaded OpenThreads (http://openthreads.sourceforge.net/) and it built fine with make on Linux, but when I try using make with Gnu Make for Windows, it shows this error: F:\ProgramFiles\OpenThreadsmake process_begin: CreateProcess(NULL, uname, ...) failed. f was unexpected at this time. make: *** [default] Error 255 and when I tried with MinGW, it gave errors I've attached as an image with this message (couldn't copy text in the Mingw prompt). Help please... Nav or Joseph? You can call me Nav :-) -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=54039#54039 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- trajce nikolov nick ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [build] Building OpenThreads on Windows
Ok thanks, using the lib that was with the osg build worked, but initially I was getting some error that it couldn't find OpenThreads_somethingwin32.lib. Now that error is no longer there. But still, I would like to know how to get it built on Windows without having to build the whole of OSG. Nav or Joseph? You can call me Nav :-) -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=54042#54042 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [build] Building OpenThreads on Windows
But still, I would like to know how to get it built on Windows without having to build the whole of OSG It is CMake driven. Generate solution and projects and work only with the OpenThreads project On Fri, May 17, 2013 at 12:39 PM, Nav Joseph nk...@tatapowersed.com wrote: Ok thanks, using the lib that was with the osg build worked, but initially I was getting some error that it couldn't find OpenThreads_somethingwin32.lib. Now that error is no longer there. But still, I would like to know how to get it built on Windows without having to build the whole of OSG. Nav or Joseph? You can call me Nav :-) -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=54042#54042 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- trajce nikolov nick ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Dynamically change the persistence of the motion blur example
Hi Robert,
Sorry I'm not much of a C++ programmer, I do most of what I can in python and
only wrap the bits I need to. This sounds like what I want to do, is there
somethings similar amongst the example s?
thanks
-Bill
On 17/05/2013, at 6:46 PM, Robert Osfield
robert.osfi...@gmail.commailto:robert.osfi...@gmail.com wrote:
Hi Bill,
Is there any reason why you could retain a ref_ptr to the Operation and
modify it in your frame loop, or get the list of operations and use a
dynamic_castMotionBlurOperation*() to determine which one is the one you need
to modify?
Robert.
On 16 May 2013 23:15, William Hart
bill.h...@utas.edu.aumailto:bill.h...@utas.edu.au wrote:
Hi,
I've been using the Accumulation buffer to apply motion blur to point cloud
animations, directly taken from the osgMotionBlur example, where the motion
blur is applied to each window as an osg::Operation. What I'd like to be able
to do is dynamically change the amount of blur by varying the persistence
parameter. I've poked around the API and found that I can remove the motion
blur operation with a removeAllOperations call then reapply the motion blur
with a different persistence value, but this causes the accumulation buffer to
be cleared. I can't see any other way to access the Operator once its been
applied.
Below is the code,
#include osgViewer/ViewerBase
#include osgViewer/Viewer
#include iostream
class MotionBlurOperation: public osg::Operation
{
public:
MotionBlurOperation(double persistence):
osg::Operation(MotionBlur,true),
cleared_(false),
persistence_(persistence)
{
}
virtual void operator () (osg::Object* object)
{
osg::GraphicsContext* gc = dynamic_castosg::GraphicsContext*(object);
if (!gc) return;
double t = gc-getState()-getFrameStamp()-getSimulationTime();
if (!cleared_)
{
// clear the accumulation buffer
glClearColor(0, 0, 0, 0);
glClear(GL_ACCUM_BUFFER_BIT);
cleared_ = true;
t0_ = t;
}
double dt = fabs(t - t0_);
t0_ = t;
// compute the blur factor
double s = powf(0.2, dt / persistence_);
// scale, accumulate and return
glAccum(GL_MULT, s);
glAccum(GL_ACCUM, 1 - s);
glAccum(GL_RETURN, 1.0f);
}
private:
bool cleared_;
double t0_;
double persistence_;
};
void motionblur(osgViewer::GraphicsWindow* w, double persistence) {
w-add(new MotionBlurOperation(persistence));
}
any ideas ?
thanks in advance
Bill
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[osg-users] osgUtil::Optimizer::optimize not obeying Permissible Optimizations for MERGE_GEODES
Greetings! This may be by design, but just in case, I wanted to ask about it. I'm using version 3.0.0, and if I look on Line 282 of osgUtil/Optimizer.cpp, the MergeGeodesVisitor is created. However, the optimizer object (this) is not passed into the constructor, and so the visitor does not have a pointer to the optimizer object. As a consequence, the visitor cannot access the optimizer's _permissibleOptimizationsMap and thus returns true every time isOperationPermissibleForObject is called. The reason I bring this up is that I do want to merge geodes, but I have four geodes in the model that I cannot allow to be merged. I was able to work around this problem by creating my own MergeGeodesVisitor, and that seems to be working well. I just have to remember not to include MERGE_GEODES in my options bit field that I pass into Optimizer::optimize(), and handle it manually myself as I described. Thank you! Cheers, Frank -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=54046#54046 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] 3D mice
I am finally getting back to this (you know, priorities). I have VRPN compiled on my computer. However, it would appear that the 3DConnexion SpaceMouse Pro might not be supported? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=54047#54047 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
