date:20100422

Re: [osg-users] Rendering a scene from two cameras

2010-04-22 Thread J.P. Delport


Hi,

are you saving in the camera callback?

jp

On 22/04/10 19:29, Vedran Pavlic wrote:

Hi,

I need to render the same scene from two angles. So i tried to create a 
osg::Viewer and set its scene data. Then I add the first camera to the viewer. And 
the scene renders fine. After that i tried to add the second camera to the viewer 
so i call viewer->addslave().

Cameras write to osg::image which i will be sending as data over the network at 
a later point, but this is irrelevant now.

I created an event on ctrl click which writes the osg::Image data to the hard 
drive. The master camera saves fine, but the slave camera saves a blank image 
file. So i guess i didn't set up the cameras correctly. This is the code in 
which i set up the cameras:


Code:
#include "Renderer.h"
#include
#include
#include "ApplicationEngine.h"
#include
#include
#include

#define VIEWPOINTDISTANCE 10

Renderer::Renderer()
:
sceneManager(SceneManager::instance())
{
mountedObject = NULL;
masterImage = new osg::Image();
masterImage->allocateImage(100, 100, 24, GL_RGB, GL_UNSIGNED_BYTE);
layoutImage = new osg::Image();
layoutImage->allocateImage(100, 100, 24, GL_RGB, GL_UNSIGNED_BYTE);

cout<<"Stvaram View.\n";

masterCamera = new osg::Camera();
 masterCamera->setProjectionMatrixAsPerspective(60.0, 1, 1, 1000.0);
masterCamera->setViewMatrixAsLookAt(osg::Vec3(0, 40, 0), osg::Vec3(0, 
-5, 0), osg::Vec3(0, 0, 1));

layoutCamera = new osg::Camera();
layoutCamera->setProjectionMatrixAsOrtho(-200, 200, 200, -200, 1, 
1000.0);
layoutCamera->setViewMatrixAsLookAt(osg::Vec3(0, 0, 100), osg::Vec3(0, 
0, -5), osg::Vec3(0, 1, 0));

viewer = new osgViewer::Viewer();
viewer->setCamera(masterCamera);

masterCamera->attach(osg::Camera::COLOR_BUFFER, masterImage, 0, 0);
layoutCamera->attach(osg::Camera::COLOR_BUFFER, layoutImage, 0, 0);

viewer->addSlave(layoutCamera);
 viewer->addEventHandler(new osgViewer::StatsHandler());
viewer->addEventHandler(ApplicationEngine::instance());
 viewer->setThreadingModel(osgViewer::Viewer::SingleThreaded);
viewer->setSceneData(sceneManager->getRootNode());
 viewer->realize();

 sceneManager->attach(this);

}

void Renderer::renderScene()
{
 viewer->frame();
}




Also if there is a better way to get this screen image on every frame feel free 
to say so.Thank you!

Cheers,
Vedran[/code]

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Re: [osg-users] Rendering to frame buffer bigger than screen

2010-04-22 Thread J.P. Delport

Hi,

search for "osgposter" on the submissions list/forum.

On 22/04/10 18:06, Iñaki García wrote:

Hi,

I have developed an OSG-based application that renders a scene to a
window. That works fine.

But my client has required the scene printed to paper (A3). The solution
I've tried is using the WindowCaptureCallback (from an OSG example in
the wiki) to read the pixels from the graphics card and, resizing the
image to fit an A3 paper, copy it to the printer device context (windows
app). This works too, but with issues:
- The A3 printer device context has much more dots (horizontal res
bigger than 4000) that pixels I can retrieve from my scene window
(800x600 aprox, it's resizable).
- The resampling makes the image heavily "pixelized": The text in the
scene is hardly readable, because of the augmentation. The frustrum
projection and raster to pixels that in screen is hardly noticed, when
scaled upwards lead to a very ugly result.

I was wondering if it's possible to render the same scene to two frame
buffers:
1) The screen framebuffer, as I have it now.
2) A "on-memory" framebuffer, much bigger (ideally the same exact
resolution that I have in the printer context to avoid resizing artifacts).

So my questions are:
- Is this possible?
- With a single osgViewer or two viewers, one for each?
- Are there limitations in the resolutions available (power of two or
whatever) or in the maximum resolution achievable?
- Is there any OSG example that uses this "memory-only frame buffer"? Or
an OSG class name where I can start reading code to learn how to use it?

Thanks in advance

Ignacio Garcia
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