Hi Carsten,
the last dayd I worked a little bit more on the problem. Thats my new
approach but still not working:
I have traversed the puppet object to get one specific node. For this
node with the help of getVolume and getCenter I get the center point of
it in world coordinates. Now I can set it as the at coordinates with
setAt() from the Navigator Class. After compiling the code I get the
following error:
Unbehandelte Ausnahme(unhandled exception) bei (at) 0x0043a40e in
01hello.exe: 0xC0000005: Zugriffsverletzung-Leseposition(access
violation) 0x00000034.
I suppose something went wrong with the NodePtr's but I cannot fix it
-----
#include <iostream>
#include <string>
//------------ OPENSG SPECIFIC INCLUDE FILES: ------------//
#include <OpenSG/OSGSimpleAttachments.h>
#include <OpenSG/OSGNodePtr.h>
//----------------------------------------------------------//
using namespace std;
OSG_USING_NAMESPACE
/************************************************************
* FUNCTION: The function traverses the graph and searches *
* for a specific node. The NodePtr which is re- *
* turned will be used in the function getAtCoor- *
* dinate. *
************************************************************/
NodePtr getAtNode(NodePtr node_of_interest) {
UInt32 children = node_of_interest->getNChildren();
// make sure the name we need exists
if (getName(node_of_interest)) {
// check if it is the name we are looking for
if(getName(node_of_interest) == string("Brustkorb")) {
// We got the node!
return node_of_interest;
}
}
// check all children
for (int i = 0; i < children; i++) {
NodePtr r = getAtNode(node_of_interest->getChild(i));
if (r != NullFC) {
// if it is not NullFC it is the node we are
looking for
return r;
}
}
// no children's name matches or there are no more childs
return NullFC;
}
-----
#include <iostream>
#include "getAtNode.h"
//------------ OPENSG SPECIFIC INCLUDE FILES: ------------//
#include <OpenSG/OSGVolume.h>
#include <OpenSG/OSGSphereVolume.h>
#include <OpenSG/OSGSimpleSceneManager.h>
//----------------------------------------------------------//
//using namespace std;
OSG_USING_NAMESPACE
// The SimpleSceneManager is a useful class which helps us to
// manage simple configurations. Here we create an instance of it.
extern SimpleSceneManager *mgr;
/************************************************************
* FUNCTION: This function computes the Bounding Box for a *
* given node and returns the center of it. *
************************************************************/
Pnt3f getAtCoordinate(NodePtr at_node) {
Pnt3f at_pnt;
at_node = getAtNode(mgr->getRoot());
at_node->getVolume(true).getCenter(at_pnt);
return at_pnt;
}
-----
main()-function part:
Navigator *nav = new Navigator;
NodePtr at_node;
Pnt3f at_pnt = getAtCoordinate(at_node);
nav->setAt(at_pnt);
nav->updateCameraTransformation();
cout << "current Transformation" << nav->getMatrix() << endl;
-----
Sadi Tanis schrieb:
> Carsten Neumann schrieb:
>
>> Hello Sadi,
>>
>>Sadi Tanis wrote:
>>
>>
>>>Hi All!
>>>
>>>I am trying to find out how to implement a trackball navigation so that
>>>the camera turns around a puppet I have loaded via VRML-Loader into the
>>>scene. For now I tried the set() function which is used in the
>>>OSG:Navigator class to change the atx,aty,atz values. Afterwards I
>>>checked the transformation matrix with the getMatrix() function. It
>>>changed but if I do any mouse action inside the window nothing has
>>>changed at all. The Camera looks still at the same point: Pnt3f(0,0,0).
>>
>>
>>how does input get from your windowing system to the navigator ?
>
>
> At the moment I use the SimpleSceneManager because I am not that
> experienced to "hard code" most of the stuff needed. So far for my two
> VRML objects (puppet, gymnastics mat) the standard navigation is set. In
> case this is bad explained by me I also added the code in addition.
>
> www.uni-koblenz.de/~saditanis/Archiv.zip
>
>
>>
>>>This part I have added for testing into the main function:
>>>
>>> >Navigator *nav = new Navigator;
>>> >nav->set(Pnt3f(0,0,1),Pnt3f(0,0.414,0.910),Vec3f(0,1,0));
>>> >nav->updateCameraTransformation();
>>> >cout << "current Transformation" << nav->getMatrix() << endl;
>>
>>
>>does this have any effect on your view ?
>
>
> No :( The view is unfortunately the same.
>
>
>>
>>>Is there another way to get the camera turn all around the puppet?
>>
>>
>>The Navigator class is meant to be a unification of the FlyNavigator,
>>TrackballNavigator (the default) and WalkNavigator. It might not be
>>trivial to use it in the way you do above, as you might get funny
>>interaction with the Navigators built in behavior. The easiest way to
>>implement a new type of navigation would probably be to write a new
>>class SomeNavigator that does what you want, that way you don't have to
>>understand the Navigator first. On the other hand you'd duplicate some
>>of the code.
>
>
> Ah ok. I thought that I could just modify the trackball navigation in
> that way, so the camera turns around my puppet.
> I also have the impression that by any mouse motion the camera does not
> move around the scene but the scene around the point of view. I have
> read something in the mailing list archive about setAbsolute()(turning
> the parameter off!). But I don't know if this solves the problem.
>
>
>> Hope it helps,
>> Carsten
>>
>
>
> regards,
> Sadi
>
--
Sadi Tanis
University of Koblenz/Landau
Student of Computer Vision
Simmerner Straße 134
56075 Koblenz Germany
Tel. +49.261.208.98.73
E-mail [EMAIL PROTECTED]
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