Re: [osg-users] Camera intrinsics
Keith Parkins wrote:
After looking at this again, I am unclear as to whether you have built
the projection matrix from the intrinsic parameters. I was assuming that
you had made it by hand. To do that you would do something like this:
//-//
// The _intrinsic variable holds the five values for the intrinsic
// matrix. The intrinsic * our pixel transform to get the projections
// matrix. The intrinsic values (itr[]) are given as five doubles
// such that:
//
//| itr[0] itr[1] itr[2] |
//| 0itr[3] itr[4] |
//| 0 0 0 |
//
//| alpha_u gamma u_0 |
//| 0alpha_v v_0 |
//| 0 0 0 |
//
//-//
void
-Camera::calcProjection() {
double alpha_u, alpha_v;
// calc alphas
alpha_u = _intrinsic[0];
double cot_theta = - _intrinsic[1]/_intrinsic[0];
double sin_theta = sqrt(1/(1+cot_theta*cot_theta));
alpha_v = _intrinsic[3] * sin_theta;
double skew = _intrinsic[1];
double u0, v0;
u0 = _intrinsic[2]; v0 = _intrinsic[4];
double left = -u0 / alpha_u * _near;
double bottom = (_screen_height-v0) / alpha_v * _near;
double right = (_screen_width - u0) / alpha_u * _near;
double top = -v0 / alpha_v * _near;
_projection[0] = 2 * _near / (right - left);
_projection[4] = 2 * _near * skew / ((right - left) * alpha_u);
_projection[5] = 2 * _near / (top - bottom);
_projection[8] = -(right + left)/(right - left);
_projection[9] = -(top + bottom)/(top - bottom);
_projection[10] = (_far + _near) / (_far - _near);
_projection[11] = 1;
_projection[14] = -2 * _far * _near/(_far-_near);
|}
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There seems to be a mismatch between the projection matrix generated by e.g.
makePerspective and the projection matrix elements you suggest here.
When I do the comparison between the two, it seems that:
_projection[5], _projection[8], _projection[9] and _projection[11] have
opposite signs.
I'm also a bit surprised that the projection matrix generated by OSG
(makePerspective) has -1 instead of 1 for _projection[11]. Maybe that has
something to do with the inversion of the Y axis (0,0 in the bottom left
instead of the top left) ?
Can you give me a suggestion why these differences exist ?
Thanks !
Benedikt.
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Re: [osg-users] [forum] Video capture with 3D augmented reality
I am trying to solve this problem more or less as you proposed:
* I have a quad with a texture that is my input video (input images are 640 x
480)
* The first camera (with depth and color clear masks) looks at the quad and
renders to the same image (I'm not sure if this is useful; it feels like an
extra unnecessary step to me). The projection matrix is an orthogonal 640 x 480
matrix, the view matrix is an identity matrix.
* The second camera (with only depth clear mask) looks at the scene and renders
this to the same image. The projection and view matrices were recorded during
the recording of the input video.
Both camera's use the COLOR_BUFFER.
I use a NodeCallback as an UpdateCallback to my quad. This callback refreshes
the quad texture with a new video image and updates the projection and view
matrices of the second camera.
I also set two final draw callbacks for each camera; just to see the contents
of the image (i.e. I call writeImageFile). For the first camera (this final
draw callback is called first), I write to file1.bmp and for the second camera
I write to file2.bmp.
My scene consists of a cylinder and a 2D picture that cuts the cylinder in the
middle.
I see that file1.bmp is what I expected: a video stream image is rendered into
the image. file2.bmp is another case (this one is saved when the second camera
has done drawing). I don't see my video stream (input) image anymore (has been
cleared somehow) and the 3D data is rendered on top of each other (due to
disabling of GL_COLOR_BUFFER_BIT ?).
I have the impression that somehow two color buffers are used at the same time;
one for the first camera and one for the second camera. Still, it's clear in
the code that I attach both camera's to osg::Camera::COLOR_BUFFER with the same
image (m_VideoImage).
How is this possible ?
Here is the code:
Code:
void VideoRecThread::setupTexture()
{
m_RenderTexture = new osg::Texture2D;
m_RenderTexture-setTextureSize(640, 480);
m_RenderTexture-setInternalFormat(GL_RGBA);
m_RenderTexture-setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
m_RenderTexture-setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
m_RenderTexture-setDataVariance(osg::Object::DYNAMIC);
}
void VideoRecThread::setupGeometry()
{
osg::Geometry* polyGeom = new osg::Geometry();
osg::ref_ptrosg::Geometry screenQuad;
screenQuad = createTexturedQuadGeometry(osg::Vec3(), osg::Vec3(640,
0.0, 0.0), osg::Vec3(0.0, 480, 0.0),
0.0f, 1.0f, 1.0f, 0.0);
m_QuadGeode = new osg::Geode;
m_QuadGeode-addDrawable(screenQuad.get());
screenQuad-setName(PolyGeom);
screenQuad-setDataVariance( osg::Object::DYNAMIC );
screenQuad-setSupportsDisplayList(false);
osg::StateSet* stateset = new osg::StateSet;
stateset-setTextureAttributeAndModes(0,
m_RenderTexture,osg::StateAttribute::ON);
screenQuad-setStateSet(stateset);
}
void VideoRecThread::setupImages()
{
m_VideoImage = new Image();
m_VideoImage-allocateImage(640,480,1, GL_RGBA, GL_UNSIGNED_BYTE);
}
void VideoRecThread::setupHudCamera()
{
m_pHudCamera = new osg::Camera;
m_pHudCamera-setReferenceFrame(osg::Transform::ABSOLUTE_RF);
m_pHudCamera-setProjectionMatrix(osg::Matrix::ortho2D(0, 640, 0, 480));
m_pHudCamera-setViewMatrix(osg::Matrix::identity());
m_pHudCamera-setRenderOrder(osg::Camera::PRE_RENDER);
m_pHudCamera-setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
m_pHudCamera-setViewport(0,0,640,480);
m_pHudCamera-setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
m_pHudCamera-attach(osg::Camera::COLOR_BUFFER, m_VideoImage);
m_pVideoRecGroup-addChild(m_pHudCamera.get());
m_pHudCamera-addChild(m_QuadGeode);
m_TextureUpdateCallback = new TextureCallback();
m_TextureUpdateCallback-updateTexture.connect(boost::bind(VideoRecThread::updateTexture,this));
m_QuadGeode-setUpdateCallback(m_TextureUpdateCallback);
m_TextureCallback = new VideoPostDrawCallback();
m_TextureCallback-renderingCompleted.connect(boost::bind(VideoRecThread:videoRenderingCompleted,this));
m_pHudCamera-setFinalDrawCallback(m_TextureCallback);
}
void VideoRecThread::setupSnapshotCamera()
{
m_pSnapshotcamera = new osg::Camera();
m_pSnapshotcamera-setReferenceFrame(osg::Transform::ABSOLUTE_RF);
m_pSnapshotcamera-setRenderOrder(osg::Camera::PRE_RENDER);
m_pSnapshotcamera-setClearMask(GL_DEPTH_BUFFER_BIT);
m_pSnapshotcamera-setViewport(0,0,640,480);
m_pSnapshotcamera-setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
m_pSnapshotcamera-attach(osg::Camera::COLOR_BUFFER, m_VideoImage);
osg::ref_ptrosg::Node pScene = getSceneManager()-getSceneData();
m_pSnapshotcamera-addChild(pScene);
Re: [osg-users] Video capture with 3D augmented reality
Already thanks for all the effort you have put in this ! I set the threading model of my viewers (I have two in my application) to osgViewer::ViewerBase::SingleThreaded. Is this what you meant with forcing OSG to singlethreaded ? I also introduced now a snapshot image where the first and second camera write to (using the aforementioned techniques : attached with the COLOR_BUFFER component). Both (at the same time or not) didn't help. I have set the clear color of the second camera (m_Snapshotcamera) to red (using the setClearColor function of the camera). I don't see any red in file2.bmp, so I think there is no clearing issue. About your remark about the clearing of the buffer: if the buffer is not cleared, then this translates into the output image, right ? Or am I mistaken ? This could explain somehow the overlapping 3D data ? On the other hand, I am sure that both final drawing callbacks are called (and in the right order), so this still doesn't explain why my input video image is gone in file2.bmp. Strange. I'm a bit without ideas right now. Any other ideas ? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=33311#33311 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Video capture with 3D augmented reality
Can this thread be moved to the general OSG forum ? I made the mistake of putting this in the OpenSceneGraph forum forum. Thank you! Cheers, benedikt -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=33313#33313 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Video capture with 3D augmented reality
Why has the format been changed from GL_RGBA to GL_RGB ? Is it not working with the alpha channel or is that just a coincidence ? Also, why do you attach the second camera to the texture and not to the image ? The example image is great :) Thank you! Cheers, Benedikt -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=7#7 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [forum] Video capture with 3D augmented reality
Thanks for your reply ! Can you explain how the structure of the camera's then will be ? And how do you flip the coordinates ? Thank you! Cheers, benedikt -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=33241#33241 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] [forum] Video capture with 3D augmented reality
I want to record a video and put 3D augmented reality on top of each frame of
the AVI. Due to the fact that I don't want to skip frames, I store all AVI
frames in memory during recording and after each video frame has been captured,
I also store the view and projection matrices of the 3D view that is currently
applicable on this video frame.
The input of the camera is 640 x 480 and my application usually renders in 1280
x 1024 windows. The video frames can be retrieved from an array of unsigned
char arrays (stored in m_RingBuffer)
I want to achieve the rendering of the 3D data on top of the video frames in a
post-processing step (which is part of the work done in a thread called
VideoPostRecThread).
I follow this strategy:
1) I set up a pre-rendering HUD camera (m_pHudCamera) which looks at a quad
geometry with one of the video frames as a texture (m_RenderTexture)
2) The HUD camera is the child of a snapshot camera (m_pSnapshotcamera) . The
snapshot renders the 3D data. The output of the snapshot camera should go back
to the video frame, but I also store it temporarily in an image
(m_SnapshotImage). For this, I disabled the GL_COLOR_BUFFER_BIT clear mask of
the snapshot camera, to make sure the rendered outputs of the HUD camera are
not cleared.
I also use two callbacks:
1) a pre-draw callback applied on the HUD camera: the texture of the quad
geometry (m_RenderTexture) is updated each time with a new frame. Name:
m_UpdateCallback (instance of the TexturePreDrawCallback struct).
2) a post-draw callback: my thread is blocked until all the 3D data is rendered
on top of the HUD contents; the callback unblocks my thread (using a mutex
called m_SnapshotMutex). After this, I can do some post-processing (like for
example saving the AVI or updating my GUI that another frame has been
post-processed). Name: m_VideoCallback (instance of the VideoPostDrawCallback
struct)
Here are my callback definitions:
Code:
struct VideoPostDrawCallback : public osg::Camera::DrawCallback
{
VideoPostDrawCallback(){}
virtual void operator() ( osg::RenderInfo renderInfo) const
{
renderingCompleted();
}
boost::signals2::signalvoid(void) renderingCompleted;
};
struct TexturePreDrawCallback : public osg::Camera::DrawCallback
{
TexturePreDrawCallback() {}
virtual void operator() ( osg::RenderInfo renderInfo) const
{
updateCamera();
}
boost::signals2::signalvoid(void) updateCamera;
};
And here is the definition of my thread class
Code:
class VideoPostRecThread : public VideoRecWithArThread
{
Q_OBJECT
friend class VideoPostDrawCallback;
public:
VideoPostRecThread (boost::shared_ptrIDSCameraManager pCamMgr,
unsigned int maxFrames, QObject *parent = NULL);
~VideoPostRecThread ();
void renderingCompleted();
void updateTextureCamera();
private:
virtual void postProcess();
void setupImages();
void setupHudCamera();
void setupSnapshotCamera();
osg::ref_ptrosg::Camera m_pSnapshotcamera;
osg::ref_ptrosg::Camera m_pHudCamera;
osg::ref_ptrosg::Image m_TextureImage;
osg::ref_ptrosg::Image m_SnapshotImage;
osg::ref_ptrosg::Texture2D m_RenderTexture;
osg::ref_ptrosg::Geode m_QuadGeode;
osg::ref_ptrVideoPostDrawCallback m_VideoCallback;
osg::ref_ptrTexturePreDrawCallback m_UpdateCallback;
QWaitCondition m_SnapshotCondition;
QMutex m_SnapshotMutex;
unsigned int m_CurrentArFrameIndex;
};
Here is the implementation of the VideoPostRecThread class.
Code:
void VideoPostRecThread ::setupImages()
{
m_SnapshotImage = new Image();
m_SnapshotImage-allocateImage(1280,1024,1, GL_RGBA, GL_UNSIGNED_BYTE);
m_TextureImage = new Image();
}
void VideoPostRecThread ::setupHudCamera()
{
// Create the texture to render to
m_RenderTexture = new osg::Texture2D;
m_RenderTexture-setDataVariance(osg::Object::DYNAMIC);
m_RenderTexture-setInternalFormat(GL_RGBA);
osg::ref_ptrosg::Geometry screenQuad;
screenQuad = osg::createTexturedQuadGeometry(osg::Vec3(),
osg::Vec3(1280, 0.0, 0.0),
osg::Vec3(0.0, 1024, 0.0));
m_QuadGeode = new osg::Geode;
m_QuadGeode-addDrawable(screenQuad.get());
m_pHudCamera = new osg::Camera;
m_pHudCamera-setReferenceFrame(osg::Transform::ABSOLUTE_RF);
m_pHudCamera-setRenderOrder(osg::Camera::PRE_RENDER);
m_pHudCamera-setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
m_pHudCamera-setProjectionMatrix(osg::Matrix::ortho2D(0, 1280, 0,
1024));
m_pHudCamera-setViewMatrix(osg::Matrix::identity());
m_pHudCamera-setViewport(0,0,1280,1024);
m_pHudCamera-addChild(m_QuadGeode);
[osg-users] Video capture with 3D augmented reality
I want to record a video and put 3D augmented reality on top of each frame of
the AVI. Due to the fact that I don't want to skip frames, I store all AVI
frames in memory during recording and after each video frame has been captured,
I also store the view and projection matrices of the 3D view that is currently
applicable on this video frame.
The input of the camera is 640 x 480 and my application usually renders in 1280
x 1024 windows. The video frames can be retrieved from an array of unsigned
char arrays (stored in m_RingBuffer)
I want to achieve the rendering of the 3D data on top of the video frames in a
post-processing step (which is part of the work done in a thread called
VideoPostRecThread).
I follow this strategy:
1) I set up a pre-rendering HUD camera (m_pHudCamera) which looks at a quad
geometry with one of the video frames as a texture (m_RenderTexture)
2) The HUD camera is the child of a snapshot camera (m_pSnapshotcamera) . The
snapshot renders the 3D data. The output of the snapshot camera should go back
to the video frame, but I also store it temporarily in an image
(m_SnapshotImage). For this, I disabled the GL_COLOR_BUFFER_BIT clear mask of
the snapshot camera, to make sure the rendered outputs of the HUD camera are
not cleared.
I also use two callbacks:
1) a pre-draw callback applied on the HUD camera: the texture of the quad
geometry (m_RenderTexture) is updated each time with a new frame. Name:
m_UpdateCallback (instance of the TexturePreDrawCallback struct).
2) a post-draw callback: my thread is blocked until all the 3D data is rendered
on top of the HUD contents; the callback unblocks my thread (using a mutex
called m_SnapshotMutex). After this, I can do some post-processing (like for
example saving the AVI or updating my GUI that another frame has been
post-processed). Name: m_VideoCallback (instance of the VideoPostDrawCallback
struct)
Here are my callback definitions:
Code:
struct VideoPostDrawCallback : public osg::Camera::DrawCallback
{
VideoPostDrawCallback(){}
virtual void operator() ( osg::RenderInfo renderInfo) const
{
renderingCompleted();
}
boost::signals2::signalvoid(void) renderingCompleted;
};
struct TexturePreDrawCallback : public osg::Camera::DrawCallback
{
TexturePreDrawCallback() {}
virtual void operator() ( osg::RenderInfo renderInfo) const
{
updateCamera();
}
boost::signals2::signalvoid(void) updateCamera;
};
And here is the definition of my thread class
Code:
class VideoPostRecThread : public VideoRecWithArThread
{
Q_OBJECT
friend class VideoPostDrawCallback;
public:
VideoPostRecThread (boost::shared_ptrIDSCameraManager pCamMgr,
unsigned int maxFrames, QObject *parent = NULL);
~VideoPostRecThread ();
void renderingCompleted();
void updateTextureCamera();
private:
virtual void postProcess();
void setupImages();
void setupHudCamera();
void setupSnapshotCamera();
osg::ref_ptrosg::Camera m_pSnapshotcamera;
osg::ref_ptrosg::Camera m_pHudCamera;
osg::ref_ptrosg::Image m_TextureImage;
osg::ref_ptrosg::Image m_SnapshotImage;
osg::ref_ptrosg::Texture2D m_RenderTexture;
osg::ref_ptrosg::Geode m_QuadGeode;
osg::ref_ptrVideoPostDrawCallback m_VideoCallback;
osg::ref_ptrTexturePreDrawCallback m_UpdateCallback;
QWaitCondition m_SnapshotCondition;
QMutex m_SnapshotMutex;
unsigned int m_CurrentArFrameIndex;
};
Here is the implementation of the VideoPostRecThread class.
Code:
void VideoPostRecThread ::setupImages()
{
m_SnapshotImage = new Image();
m_SnapshotImage-allocateImage(1280,1024,1, GL_RGBA, GL_UNSIGNED_BYTE);
m_TextureImage = new Image();
}
void VideoPostRecThread ::setupHudCamera()
{
// Create the texture to render to
m_RenderTexture = new osg::Texture2D;
m_RenderTexture-setDataVariance(osg::Object::DYNAMIC);
m_RenderTexture-setInternalFormat(GL_RGBA);
osg::ref_ptrosg::Geometry screenQuad;
screenQuad = osg::createTexturedQuadGeometry(osg::Vec3(),
osg::Vec3(1280, 0.0, 0.0),
osg::Vec3(0.0, 1024, 0.0));
m_QuadGeode = new osg::Geode;
m_QuadGeode-addDrawable(screenQuad.get());
m_pHudCamera = new osg::Camera;
m_pHudCamera-setReferenceFrame(osg::Transform::ABSOLUTE_RF);
m_pHudCamera-setRenderOrder(osg::Camera::PRE_RENDER);
m_pHudCamera-setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
m_pHudCamera-setProjectionMatrix(osg::Matrix::ortho2D(0, 1280, 0,
1024));
m_pHudCamera-setViewMatrix(osg::Matrix::identity());
m_pHudCamera-setViewport(0,0,1280,1024);
m_pHudCamera-addChild(m_QuadGeode);
Re: [osg-users] [forum] Video capture with 3D augmented reality
Hi, Can this post be removed ? I posted this in the wrong forum group. I already moved it to the General Forum of the OpenSceneGraph list. Thank you! Cheers, benedikt -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=33173#33173 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Video capture with 3D augmented reality
The weird thing is that it is not working with the frame buffer object render target (black image). Should I consider a pbuffer ? Thank you! Cheers, benedikt -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=33190#33190 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Screenshot to non OSG image
Robert, Basically, I want to render my scene data onto an image which is not an OSG image, but has the same structure, i.e. * 8 bits red * 8 bits green * 8 bits blue The image (memory block) contains already something (see it as a background) and thus I only want my 3D scene objects on top of it. Can you explain which parts of my original post are unclear, such that I can rectify this ? Thank you! Cheers, benedikt -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=31692#31692 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Screenshot to non OSG image
Or maybe someone can give me an indication if this is possible or not ? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=31637#31637 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Screenshot to non OSG image
Dear all, I want to combine a movie (movie shot by a camera) with some OSG 3D objects. I already managed to make sure that the position and orientation of the camera are stored each time a picture is grabbed (as part of the movie). The sequence of the movie is stored in memory (can choose between RGB24 and RGB32) in a buffer (an array of char* blocks). I just need to call an API function of the camera to convert this to an AVI sequence. Now before I call this function to convert the contents of the buffer to an AVI movie, I want to do the OSG rendering (this is my postprocessing step). The technique I use, is: * Adding an OSG camera to the OSG root node and adding the scene data as a child to the OSG camera * Set the render order as POST_RENDER * Set the target of the rendering to FRAME_BUFFER_OBJECT * I explicitly don't set the clear mask for the camera: setClearMask((GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) is not present in the code. I hope this is right ? This results in the following code: Code: m_pSnapshotcamera = new Camera; m_refpARRoot-addChild( m_pSnapshotcamera ); m_pSnapshotcamera-setReferenceFrame(osg::Transform::ABSOLUTE_RF); m_pSnapshotcamera-setProjectionMatrixAsPerspective(snapVerFov, snapAspect,0.01, 4); m_pSnapshotcamera-setDrawBuffer(GL_BACK); m_pSnapshotcamera-setReadBuffer(GL_BACK); m_pSnapshotcamera-setRenderOrder(osg::Camera::POST_RENDER); m_pSnapshotcamera-setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT); Now, how do I assign the (AVI sequence) memory as the frame buffer to write to ? I am aware of the attach() member function of the Camera class, but this needs an (OSG) image as a parameter. Also, how can I make sure that OSG renders the 3D objects into a window with the size of the camera (video) pictures? I clarify: in the code above, I already defined the horizontal and vertical field of view (using the aspect ratio), but still the system can't deduce what the size of the frame buffer is (let's assume that the video is 640 x 480, which is different than the standard size of my OSG widgets). Thank you! Kind regards, Benedikt Naessens.[/code] -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=31594#31594 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Culling traversal
I have an OSG tree, where I want some nodes to be visible and some hidden. Currently, I set the visibility status with nodemasks; I don't want to use switches, because I want to set the visibility of nodes dynamically (thus, otherwise, each node would need a switch). I have a situation where I want to hide a node X and all its children, with the exception of one its children. I made an NodeVisitor which adapts all the nodemasks of the node X and all its children. I know that if you want to hide the node and its children, basically you only need to change the nodemask of node X, because the cull visitor stops at node X. But, this is obviously not the behaviour I want. How can I change the behaviour of the CullVisitor, so I doesn't stop at nodes with the hidden nodemask ? I use setInheritanceMask ( with inheritancemask = osg::CullSettings::ALL_VARIABLES ~osg::CullSettings::CULL_MASK) and setCullMask, but it seems that does something different. I am a bit confused of how inheritance masks work. Do I have to set the traversal mask of the cull visitor ? How do I apply then a new cull visitor on a camera (or viewer ...) ? Thank you! Benedikt. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30522#30522 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] 3D objects that don't rescale
Can you make 3D objects that don't rescale in OSG ? To clarify : if you move the camera closer and further, they will still have the same size. Still, they need to rotate and translate according to the movement of the camera. An example of that is the OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT character size mode for text. Here the text always has the same font size, independent of how far you are from the text geode. What I would like to have is something similar for for example points, lines and boxes. Thank you! Kind regards, Benedikt -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30175#30175 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] 3D objects that don't rescale
Thanks ! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30180#30180 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG stereo features
Alberto Luaces wrote: Benedikt, take a look at this link: [cut URL] with this you can change the stereo behaviour of your program without touching a line of code. Of course you can also do the same programmatically. -- Alberto Thanks for the fast reply. I have already seen the page. I was just wondering how to do it programmatically; what these environment variables exactly do and what to use then : still a CompositeViewer with two camera's or a Viewer or ... ? How to get access to the stereo camera's to set the view and projection matrices (such that the interocular distance remains the same) ? This is all still very unclear to me ... -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=26418#26418 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG stereo features
robertosfield wrote: Have you spotted the osgviewerQT examples? Robert. I am using the QSceneGraph class to put dialogs and other items on and do the OSG rendering in the drawBackground() member function. Framerate drops quite drastically, but that could also be because of the dual screen and the higher resolution (than I was used to work with in the past). Do you think the osgviewerQT examples would be more efficient ? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=26419#26419 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] OSG stereo features
Can anybody on the forum explain how to use the stereo support in OSG? I tried every possible combination of DisplaySettings, OsgViewer, OSG, stereo, etc. on Google to find any documentation, but I didn't get further than some obscure forums where only part of it was explained. The main page of the OSG site is not clear either. Currently, I am using a CompositeViewer with two views (two camera's), but I guess there are better ways out there. I have found some information how to do it with the OSGViewer application, but looking at the code of the OSGViewer app doesn't help. I want to integrate this into a Qt application anyway, so simply starting the OsgViewer is no solution. Also the DisplaySettings class probably can help me, but I have no clue how to integrate that information with a viewer. Also, any information on techniques (OSG ?) how to find the interocular distance is not easy to find. Can anyone give me a clue on this ? From time to time, I also find some pages that report some problems with the fusion matrix. What is this problem exactly (missing the point what a fusion matrix is anyway) and has it been fixed ? Sorry for the amount of questions and my ignorance. Thank you! Cheers, Benedikt. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=26384#26384 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
