Re: [osg-users] cross axes
For everyone will need it I'm attaching the code. Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=50580#50580 Attachments: http://forum.openscenegraph.org//files/crossaxes_131.zip ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Dear Sir, I still don't know how to settle the scale problem. Would you please help me with that. Thank you very much. Jonathan Richard wrote: Hi Gianni Thank you for your reply. It's ok I finally got it working. Jonathan On Wed, Aug 11, 2010 at 9:34 AM, Gianni Ambrosio wrote: Sorry Jonathan for the delay. Unfortunately I don't remember exactly which modifications I did but if you need I can give you my actual piece of code. Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30691#30691 ___ osg-users mailing list http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Post generated by Mail2Forum -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41755#41755 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Hi Gianni Thank you for your reply. It's ok I finally got it working. Jonathan On Wed, Aug 11, 2010 at 9:34 AM, Gianni Ambrosio ga...@vi-grade.com wrote: Sorry Jonathan for the delay. Unfortunately I don't remember exactly which modifications I did but if you need I can give you my actual piece of code. Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30691#30691 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Anyway, here is basically the code I used to update the axis: double offset = 80.0; crosscamera-setProjectionMatrix(osg::Matrix::ortho2D(-offset, iWidth-offset, -offset, iHeight-offset)); where offset is hardcoded here and it depends on the length of the axis. iWidth and iHeight are the width and height of the viewer (I don't know haw to get them I implemented the code for a Qt window where I can easily get them). HTH Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30692#30692 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Hi Gianni, I'm trying to get working your example with the modification suggested by David but the axis appears to be drawn outside of my window. If I disable Can you tell me what modification did you perform on your NodeCallback implementation to get it working? Thanks Jonathan On 7/1/10, Gianni Ambrosio ga...@vi-grade.com wrote: OK, I used what Davide suggested + a modification of my NodeCallback implementation and now it works fine. Thanks Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29612#29612 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Thanks Nick, I implement it but some modifications caused another problem I don't understand. In the old code I created a cross axes with size=1.5 for each axis. The ortho camera was defined as follows: camera-setProjectionMatrix(osg::Matrix::ortho2D(-1.7, 17.75, -1.7, 13.86)); Then I had to fix the resize problem as you suggested. So, on resize event I used the actual viewer width and height. Here is basically the call: camera-setProjectionMatrix(osg::Matrix::ortho2D(-axisSize, iWidth-axisSize, -axisSize, iHeight-axisSize)); but the axis size=1.5 was to small in this case and I had to increase it to 70 to be seen. Now the problem. On top of each axis an osgText to diplays the labels X, Y and Z. When an axis points towards out of the screen (more or less) the label disappears. In the previous implementation with axis size=1.5 it worked correctly. Can you please explain me why? Regards Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29579#29579 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
could you post a working code of it? I will have a look at -Nick On Thu, Jul 1, 2010 at 1:35 PM, Gianni Ambrosio ga...@vi-grade.com wrote: Thanks Nick, I implement it but some modifications caused another problem I don't understand. In the old code I created a cross axes with size=1.5 for each axis. The ortho camera was defined as follows: camera-setProjectionMatrix(osg::Matrix::ortho2D(-1.7, 17.75, -1.7, 13.86)); Then I had to fix the resize problem as you suggested. So, on resize event I used the actual viewer width and height. Here is basically the call: camera-setProjectionMatrix(osg::Matrix::ortho2D(-axisSize, iWidth-axisSize, -axisSize, iHeight-axisSize)); but the axis size=1.5 was to small in this case and I had to increase it to 70 to be seen. Now the problem. On top of each axis an osgText to diplays the labels X, Y and Z. When an axis points towards out of the screen (more or less) the label disappears. In the previous implementation with axis size=1.5 it worked correctly. Can you please explain me why? Regards Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29579#29579 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Nick, here is a working code showing the label disappearing problem:
Code:
#include osgViewer/Viewer
#include osgText/Text
#include osg/LineWidth
#include osg/Geometry
#include osgGA/TrackballManipulator
osgText::Text* createAxisLabel(const std::string iLabel, const osg::Vec3
iPosition)
{
osgText::Text* text = new osgText::Text;
text-setFont(arial.ttf);
text-setText(iLabel);
text-setPosition(iPosition);
text-setCharacterSize(17);
text-setAutoRotateToScreen(true);
text-setColor(osg::Vec4(204, 204, 0, 1));
text-setCharacterSizeMode(osgText::Text::SCREEN_COORDS);
return text;
}
osg::Geometry* createArrow(const osg::Matrixd iTransform, const osg::Vec4
iColor, double iHeight)
{
osg::Geometry* geometry = new osg::Geometry;
double pyramidBaseZ = iHeight/3.0*2.0;
double outerBaseRadius = iHeight/9.0;
osg::Vec3Array* vertices = new osg::Vec3Array(7);
(*vertices)[0].set(iTransform.preMult(osg::Vec3d(outerBaseRadius, 0.0,
pyramidBaseZ)));
(*vertices)[1].set(iTransform.preMult(osg::Vec3d(0.0, outerBaseRadius,
pyramidBaseZ)));
(*vertices)[2].set(iTransform.preMult(osg::Vec3d(-outerBaseRadius, 0.0,
pyramidBaseZ)));
(*vertices)[3].set(iTransform.preMult(osg::Vec3d(0.0, -outerBaseRadius,
pyramidBaseZ)));
(*vertices)[4].set(iTransform.preMult(osg::Vec3d(0.0, 0.0, iHeight)));
(*vertices)[5].set(iTransform.preMult(osg::Vec3d(0.0, 0.0, iHeight)));
(*vertices)[6].set(iTransform.preMult(osg::Vec3d(0.0, 0.0, 0.0)));
osg::UByteArray* indices = new osg::UByteArray(20);
(*indices)[0]=0; (*indices)[1]=1; (*indices)[2]=4;
(*indices)[3]=1; (*indices)[4]=2; (*indices)[5]=4;
(*indices)[6]=2; (*indices)[7]=3; (*indices)[8]=4;
(*indices)[9]=3; (*indices)[10]=0; (*indices)[11]=4;
(*indices)[12]=1; (*indices)[13]=0; (*indices)[14]=3;
(*indices)[15]=2; (*indices)[16]=1; (*indices)[17]=3;
(*indices)[18]=5;
(*indices)[19]=6;
geometry-setVertexArray(vertices);
geometry-setVertexIndices(indices);
osg::Vec4Array* colors = new osg::Vec4Array;
colors-push_back(iColor);
geometry-setColorArray(colors);
geometry-setColorBinding(osg::Geometry::BIND_OVERALL);
geometry-addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLES,
0, indices-size()-2));
geometry-addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINES,
indices-size()-2, 2));
return geometry;
}
osg::Geometry* createXAxis(double iHeight)
{
osg::Matrixd transform = osg::Matrix::rotate(osg::inDegrees(90.0f), 0.0f,
1.0f, 0.0f);
osg::Vec4 color(0.5f,0.125f,0.125f,1.0f);
osg::Geometry* geometry = createArrow(transform, color, iHeight);
return geometry;
}
osg::Geometry* createYAxis(double iHeight)
{
osg::Matrixd transform = osg::Matrix::rotate(osg::inDegrees(-90.0f), 1.0f,
0.0f, 0.0f);
osg::Vec4 color(0.125f,0.5f,0.125f,1.0f);
osg::Geometry* geometry = createArrow(transform, color, iHeight);
return geometry;
}
osg::Geometry* createZAxis(double iHeight)
{
osg::Matrixd transform = osg::Matrix::identity();
osg::Vec4 color(0.125f,0.125f,0.5f,1.0f);
osg::Geometry* geometry = createArrow(transform, color, iHeight);
return geometry;
}
osg::Geode* createAxesGeometry()
{
osg::Geode* geode = new osg::Geode;
osg::LineWidth* lineWidth = new osg::LineWidth(2);
geode-getOrCreateStateSet()-setAttributeAndModes(lineWidth,
osg::StateAttribute::ON);
geode-getOrCreateStateSet()-setMode(GL_LIGHTING, osg::StateAttribute::OFF);
double length = 70.0;
geode-addDrawable(createXAxis(length));
geode-addDrawable(createYAxis(length));
geode-addDrawable(createZAxis(length));
geode-addDrawable(createAxisLabel(X, osg::Vec3(length*1.05, 0, 0)));
geode-addDrawable(createAxisLabel(Y, osg::Vec3(0, length*1.05, 0)));
geode-addDrawable(createAxisLabel(Z, osg::Vec3(0, 0, length*1.05)));
return geode;
}
class AxisCameraUpdateCallback:public osg::NodeCallback
{
public:
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
if(nv-getVisitorType() == osg::NodeVisitor::UPDATE_VISITOR)
{
osg::Camera* camera = dynamic_castosg::Camera*(node);
if (camera)
{
osg::View* view = camera-getView();
if (view view-getNumSlaves() 0)
{
osg::View::Slave* slave = view-getSlave(0);
if(slave-_camera.get() == camera)
{
osg::Camera* masterCam = view-getCamera();
osg::Vec3 eye, center, up;
masterCam-getViewMatrixAsLookAt(eye, center, up, 30);
osg::Matrixd matrix;
matrix.makeLookAt(eye-center, osg::Vec3(0, 0, 0), up); //
always look at (0, 0, 0)
camera-setViewMatrix(matrix);
}
}
}
}
traverse(node,nv);
}
};
osg::Camera* createHUD()
{
osg::Camera* camera = new osg::Camera;
camera-setProjectionMatrix(osg::Matrix::ortho2D(-80, 1280-80,
Re: [osg-users] cross axes
cool. I ll have a look later today and get back to you
-Nick
On Thu, Jul 1, 2010 at 2:51 PM, Gianni Ambrosio ga...@vi-grade.com wrote:
Nick, here is a working code showing the label disappearing problem:
Code:
#include osgViewer/Viewer
#include osgText/Text
#include osg/LineWidth
#include osg/Geometry
#include osgGA/TrackballManipulator
osgText::Text* createAxisLabel(const std::string iLabel, const osg::Vec3
iPosition)
{
osgText::Text* text = new osgText::Text;
text-setFont(arial.ttf);
text-setText(iLabel);
text-setPosition(iPosition);
text-setCharacterSize(17);
text-setAutoRotateToScreen(true);
text-setColor(osg::Vec4(204, 204, 0, 1));
text-setCharacterSizeMode(osgText::Text::SCREEN_COORDS);
return text;
}
osg::Geometry* createArrow(const osg::Matrixd iTransform, const osg::Vec4
iColor, double iHeight)
{
osg::Geometry* geometry = new osg::Geometry;
double pyramidBaseZ = iHeight/3.0*2.0;
double outerBaseRadius = iHeight/9.0;
osg::Vec3Array* vertices = new osg::Vec3Array(7);
(*vertices)[0].set(iTransform.preMult(osg::Vec3d(outerBaseRadius, 0.0,
pyramidBaseZ)));
(*vertices)[1].set(iTransform.preMult(osg::Vec3d(0.0, outerBaseRadius,
pyramidBaseZ)));
(*vertices)[2].set(iTransform.preMult(osg::Vec3d(-outerBaseRadius, 0.0,
pyramidBaseZ)));
(*vertices)[3].set(iTransform.preMult(osg::Vec3d(0.0, -outerBaseRadius,
pyramidBaseZ)));
(*vertices)[4].set(iTransform.preMult(osg::Vec3d(0.0, 0.0, iHeight)));
(*vertices)[5].set(iTransform.preMult(osg::Vec3d(0.0, 0.0, iHeight)));
(*vertices)[6].set(iTransform.preMult(osg::Vec3d(0.0, 0.0, 0.0)));
osg::UByteArray* indices = new osg::UByteArray(20);
(*indices)[0]=0; (*indices)[1]=1; (*indices)[2]=4;
(*indices)[3]=1; (*indices)[4]=2; (*indices)[5]=4;
(*indices)[6]=2; (*indices)[7]=3; (*indices)[8]=4;
(*indices)[9]=3; (*indices)[10]=0; (*indices)[11]=4;
(*indices)[12]=1; (*indices)[13]=0; (*indices)[14]=3;
(*indices)[15]=2; (*indices)[16]=1; (*indices)[17]=3;
(*indices)[18]=5;
(*indices)[19]=6;
geometry-setVertexArray(vertices);
geometry-setVertexIndices(indices);
osg::Vec4Array* colors = new osg::Vec4Array;
colors-push_back(iColor);
geometry-setColorArray(colors);
geometry-setColorBinding(osg::Geometry::BIND_OVERALL);
geometry-addPrimitiveSet(new
osg::DrawArrays(osg::PrimitiveSet::TRIANGLES, 0, indices-size()-2));
geometry-addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINES,
indices-size()-2, 2));
return geometry;
}
osg::Geometry* createXAxis(double iHeight)
{
osg::Matrixd transform = osg::Matrix::rotate(osg::inDegrees(90.0f), 0.0f,
1.0f, 0.0f);
osg::Vec4 color(0.5f,0.125f,0.125f,1.0f);
osg::Geometry* geometry = createArrow(transform, color, iHeight);
return geometry;
}
osg::Geometry* createYAxis(double iHeight)
{
osg::Matrixd transform = osg::Matrix::rotate(osg::inDegrees(-90.0f),
1.0f, 0.0f, 0.0f);
osg::Vec4 color(0.125f,0.5f,0.125f,1.0f);
osg::Geometry* geometry = createArrow(transform, color, iHeight);
return geometry;
}
osg::Geometry* createZAxis(double iHeight)
{
osg::Matrixd transform = osg::Matrix::identity();
osg::Vec4 color(0.125f,0.125f,0.5f,1.0f);
osg::Geometry* geometry = createArrow(transform, color, iHeight);
return geometry;
}
osg::Geode* createAxesGeometry()
{
osg::Geode* geode = new osg::Geode;
osg::LineWidth* lineWidth = new osg::LineWidth(2);
geode-getOrCreateStateSet()-setAttributeAndModes(lineWidth,
osg::StateAttribute::ON);
geode-getOrCreateStateSet()-setMode(GL_LIGHTING,
osg::StateAttribute::OFF);
double length = 70.0;
geode-addDrawable(createXAxis(length));
geode-addDrawable(createYAxis(length));
geode-addDrawable(createZAxis(length));
geode-addDrawable(createAxisLabel(X, osg::Vec3(length*1.05, 0, 0)));
geode-addDrawable(createAxisLabel(Y, osg::Vec3(0, length*1.05, 0)));
geode-addDrawable(createAxisLabel(Z, osg::Vec3(0, 0, length*1.05)));
return geode;
}
class AxisCameraUpdateCallback:public osg::NodeCallback
{
public:
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
if(nv-getVisitorType() == osg::NodeVisitor::UPDATE_VISITOR)
{
osg::Camera* camera = dynamic_castosg::Camera*(node);
if (camera)
{
osg::View* view = camera-getView();
if (view view-getNumSlaves() 0)
{
osg::View::Slave* slave = view-getSlave(0);
if(slave-_camera.get() == camera)
{
osg::Camera* masterCam = view-getCamera();
osg::Vec3 eye, center, up;
masterCam-getViewMatrixAsLookAt(eye, center, up, 30);
osg::Matrixd matrix;
matrix.makeLookAt(eye-center, osg::Vec3(0, 0, 0), up); //
always look at (0, 0, 0)
camera-setViewMatrix(matrix);
}
}
}
}
Re: [osg-users] cross axes
Hi Gianni, I had a similar problem in the past, and it was related to the camera clipping. In my case it was enough to move the axes inside the screen, as shown in the following code snippet: // create a camera to set up the projection and model view matrices, and the subgraph to drawn in the HUD osg::Camera* camera = new osg::Camera; // set the projection matrix camera-setProjectionMatrix(osg::Matrix::ortho2D(0,1280,0,1024)); // set the view matrix camera-setReferenceFrame(osg::Transform::ABSOLUTE_RF); camera-setViewMatrix(osg::Matrix::identity()); // only clear the depth buffer camera-setClearMask(GL_DEPTH_BUFFER_BIT); // draw subgraph after main camera view. camera-setRenderOrder(osg::Camera::POST_RENDER); // we don't want the camera to grab event focus from the viewers main camera(s). camera-setAllowEventFocus(false); // put the axes under the hud transformation node hudAxesTransform = new osg::PositionAttitudeTransform(); hudAxesTransform-setPosition(osg::Vec3(80,50,-100)); // put inside the scren (z=-100) to avoid clipping hudAxesTransform-addChild(graphics::utils::createAxes(0.5)); osg::StateSet *state = hudAxesTransform-getOrCreateStateSet(); state-setMode(GL_LIGHTING, osg::StateAttribute::OFF); // add to the hud camera a subgraph to render and add to the main graph camera-addChild(hudAxesTransform); root-addChild(camera); ciao, Davide -- Forwarded message -- From: Gianni Ambrosio ga...@vi-grade.com To: osg-users@lists.openscenegraph.org Date: Thu, 01 Jul 2010 09:35:29 + Subject: Re: [osg-users] cross axes Thanks Nick, I implement it but some modifications caused another problem I don't understand. (...) Now the problem. On top of each axis an osgText to diplays the labels X, Y and Z. When an axis points towards out of the screen (more or less) the label disappears. In the previous implementation with axis size=1.5 it worked correctly. Can you please explain me why? Regards Gianni ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Thanks Davide. I considered that but since I would prefer to fix the axes origin to (0,0,0), I tried setting big values for zNear/zFar parameters for camera as follows: setProjectionMatrixAsOrtho(-80, 1280-80, -80, 1024-80,-800, 800); but nothing changed. Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29604#29604 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Gianni, I would follow Davide's hints and see if it works -Nick On Thu, Jul 1, 2010 at 5:36 PM, Gianni Ambrosio ga...@vi-grade.com wrote: Thanks Davide. I considered that but since I would prefer to fix the axes origin to (0,0,0), I tried setting big values for zNear/zFar parameters for camera as follows: setProjectionMatrixAsOrtho(-80, 1280-80, -80, 1024-80,-800, 800); but nothing changed. Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29604#29604 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
OK, I used what Davide suggested + a modification of my NodeCallback implementation and now it works fine. Thanks Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29612#29612 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Hi Nick, I'm using Qt and reimplemented the virtual method: virtual void resizeGL( int width, int height ) that is called on every window resize. I get the ortho camera and called getProjectionMatrixAsOrtho(left, right, bottom, top, zNear, zFar); just to verify the values. Do you mean I should change those parameters depending on the actual width height of the window? Regards Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29528#29528 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
exactly. make your ortho with the new window size -Nick On Wed, Jun 30, 2010 at 7:21 PM, Gianni Ambrosio ga...@vi-grade.com wrote: Hi Nick, I'm using Qt and reimplemented the virtual method: virtual void resizeGL( int width, int height ) that is called on every window resize. I get the ortho camera and called getProjectionMatrixAsOrtho(left, right, bottom, top, zNear, zFar); just to verify the values. Do you mean I should change those parameters depending on the actual width height of the window? Regards Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29528#29528 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
if you are doing it thru ortho camera, then you have to change the camera settings to fit your new window size on resize -Nick On Fri, Jun 25, 2010 at 11:50 AM, Gianni Ambrosio ga...@vi-grade.comwrote: Another question. Now the axes works fine in the left bottom corner but if I resize the viewer window (I use QT embedding the viewer inside) the cross axes object is deformed accordingly. How can I prevent that? I mean, I agree to resize the axes but in a homogeneous way for every axis. Regards Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29405#29405 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Another question. Now the axes works fine in the left bottom corner but if I resize the viewer window (I use QT embedding the viewer inside) the cross axes object is deformed accordingly. How can I prevent that? I mean, I agree to resize the axes but in a homogeneous way for every axis. Regards Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29405#29405 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Thanks Paul, you are right! Regards Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29287#29287 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Since I did't find a complete example for adding a cross axes in a view, here
is the sample code I roughly implemented. I starded from what Jimmy suggested
here http://forum.openscenegraph.org/viewtopic.php?t=2205highlight=axis.
Code:
ViewerQT* viewerWindow = new ViewerQT;
osg::Group* root = new osg::Group;
osg::Camera* camera = createHUD();
viewerWindow-addSlave(camera, false);
root-addChild(camera);
root-addChild(loadedModel);
viewerWindow-setCameraManipulator(new osgGA::TrackballManipulator);
viewerWindow-setSceneData(root);
viewerWindow-show();
osg::Camera* createHUD()
{
osg::Camera* camera = new osg::Camera;
camera-setProjectionMatrix(osg::Matrix::ortho2D(-1.5, 17.75, -1.5, 13.86));
camera-setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera-setClearMask(GL_DEPTH_BUFFER_BIT);
camera-setRenderOrder(osg::Camera::POST_RENDER);
camera-setUpdateCallback(new AxisCameraUpdateCallback);
osg::Node* axes = osgDB::readNodeFile(axes.osg);
camera-addChild(axes);
return camera;
}
class AxisCameraUpdateCallback:public osg::NodeCallback
{
public:
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
if(nv-getVisitorType() == osg::NodeVisitor::UPDATE_VISITOR)
{
osg::Camera* camera = dynamic_castosg::Camera*(node);
if (camera)
{
osg::View* view = camera-getView();
if (view view-getNumSlaves() 0)
{
osg::View::Slave* slave = view-getSlave(0);
if(slave-_camera.get() == camera)
{
osg::Camera* masterCam = view-getCamera();
osg::Vec3 eye, center, up;
masterCam-getViewMatrixAsLookAt(eye, center, up, 30);
osg::Matrixd matrix;
matrix.makeLookAt(eye-center, osg::Vec3(0, 0, 0), up);
// always look at (0, 0, 0)
camera-setViewMatrix(matrix);
}
}
}
}
traverse(node,nv);
}
};
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Re: [osg-users] cross axes
I have one question about my posted code. I added viewerWindow-addSlave(camera, false); otherwise camera-getView() call in AxisCameraUpdateCallback::operator() fails. I didn't find any documentation about that and I tried just intuitively. Regards Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29289#29289 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
One more question. Suppose I have two viewers and I would like to show the axes just in one of them. Since the camera with the axes model is in the scene, is there any flexible way to enable/disable the axes in one viewer? Regards Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29290#29290 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Hello Gianni, One more question. Suppose I have two viewers and I would like to show the axes just in one of them. Since the camera with the axes model is in the scene, is there any flexible way to enable/disable the axes in one viewer? You could search the archives for hints of how to display something in only one view. It's been discussed before, and there are a few ways to do it. I generally do it by adding the appropriate subgraph (object or HUD camera) directly under the master camera of the view in which I want to see it (view-getCamera()) instead of under a scene root which is visible in all views. I find that easy to manage. Another way is to add a cull callback which will examine the current camera and only traverse the children if it's the right one(s). Yet another way is with node masks and cull masks in the cullVisitor, but you'll run out of bits in a 32-bit node mask pretty fast, especially if you use node masks for other things too. Node masks have the disadvantage that your whole app needs to know all the node masks in use everywhere or else you'll end up with one bit being used for two things and will have problems. So they're useful for some things but I wouldn't use them for this (personally). Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Hi Jean-Sebastien, Skylark wrote: So they're useful for some things but I wouldn't use them for this (personally). I agree, if I understood correctly it doesn't make much sense in my case. Thanks fot the other ways you suggested. Regards Gianni -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29311#29311 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] cross axes
Looking around I found a topic that could help but I will ask some help about
that later.
Now, can anybody explain me please why I don't see the axes object in the
bottom left corner of the viewer using the following code? I can see the cessna
plane only in the viewer.
ViewerQT* viewerWindow = new ViewerQT;
osg::Group* root = new osg::Group;
osg::Node* loadedModel = osgDB::readNodeFiles(cessna.osg);
root-addChild(loadedModel);
root-addChild(createHUD());
viewerWindow-setCameraManipulator(new osgGA::TrackballManipulator);
viewerWindow-setSceneData(root);
viewerWindow-show();
osg::Camera* createHUD()
{
osg::Camera* camera = new osg::Camera;
camera-setProjectionMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
camera-setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera-setViewMatrix(osg::Matrix::identity());
camera-setClearMask(GL_DEPTH_BUFFER_BIT);
camera-setRenderOrder(osg::Camera::POST_RENDER);
camera-setAllowEventFocus(false);
osg::Node* axes = osgDB::readNodeFile(axes.osg);
camera-addChild(axes);
return camera;
}
Regards
Gianni
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Re: [osg-users] cross axes
Gianni Ambrosio wrote:
Looking around I found a topic that could help but I will ask some help about
that later.
Now, can anybody explain me please why I don't see the axes object in the
bottom left corner of the viewer using the following code? I can see the cessna
plane only in the viewer.
...
osg::Camera* createHUD()
{
osg::Camera* camera = new osg::Camera;
camera-setProjectionMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
camera-setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera-setViewMatrix(osg::Matrix::identity());
camera-setClearMask(GL_DEPTH_BUFFER_BIT);
camera-setRenderOrder(osg::Camera::POST_RENDER);
camera-setAllowEventFocus(false);
osg::Node* axes = osgDB::readNodeFile(axes.osg);
camera-addChild(axes);
return camera;
}
The axes.osg model has a bounding volume that extends from approximately (0, 0,
0) to (1, 1, 1). With the transformation you've specified, the model will
subtend less that one pixel of screen space.
--
-Paul Martz Skew Matrix Software
http://www.skew-matrix.com/
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