well, you specify the origin of the local coordinate space on the marker 
explicitly, with the center[] values.  using (0,0) puts it in the center 
of the marker.

if you want the position of the marker in global (camera) coordinates,
it's easy to get - you just need to grab the translation vector out of the
marker's transformation matrix.  that's just the last column.

as for fullscreen mode, you should be able to just call glutFullScreen (if
you're using GLUT) after argInit, but i'm not positive.

-steve diverdi
-sdiverdi@c ..........

> Hi,
> 
> Can someone tell me where I can get the pattern center position 
> (coordinates)? I'd like to use this to calculate when too paterns are close 
> to each other.
> 
> Other question: What do I need to change to artoolkit show the video in 
> full screen?
> 
> Thanks,
> Bruno Fernandes.
> 
> 

Hi,

Can someone tell me where I can get the pattern center position 
(coordinates)? I'd like to use this to calculate when too paterns are close 
to each other.

Other question: What do I need to change to artoolkit show the video in 
full screen?

Thanks,
Bruno Fernandes.

On Fri, 06 Jun 2003 16:49:05 +0100, Bruno <bruno@i .....> wrote:

> Hi,
>
> Can someone tell me where I can get the pattern center position 
> (coordinates)? I'd like to use this to calculate when too paterns are 
> close to each other.
>
> Other question: What do I need to change to artoolkit show the video in 
> full screen?
>
> Thanks,
> Bruno Fernandes.
>
>

Hi!

You can use the object.trans[3][4]-matrix to get easy to the center of the 
marker:
the fields [0][3], [1][3] and [2][3] are the tx, ty, tz translation-values, 
which define the absolute position of your marker in your openGl-world.

to change ar-toolkit to fullscreen call your argInit() like this:

double zoom = 2.0; // to scale the video-image, e.g. a 320x240-captured 
image would now result in a
                   // 640x480 glut-window
int b_fullScreen = 1; // boolean, 0 = windowed, 1 = fullscreen

    argInit( &cparam, zoom, b_fullScreen, 0, 0, 0 );

// (the next three parameters are x,y-values and a flag for the use of an 
head mounted display;
//  don't bother)


greetings,
Toby.


-- 
- www.augmented.org -- www.footfighters.de -
- My life for Aiur... uh, I mean Ner'zhul! -

Bruno wrote:

> Other question: What do I need to change to artoolkit show the video 
> in full screen?

I came up with the following to get a nice fullscreen support. The code 
is based upon artoolkits simple example for windows.

greets,
 leif

---

//*** top of your main
#include <winbase.h>
#include <wingdi.h>            // devmode - for getting the device context
#include <winuser.h>        // enumdisplaysettings

#define ARWIN_FULLSCREEN
//#define ARWIN_CHANGEDISPLAY      // annoying while coding but usefull 
for final versions
#define ARWIN_DISPLAYWIDTH 640
#define ARWIN_DISPLAYHEIGHT 480


//*** somewhere to your main source
BOOL ChangeScreenResolution (int width, int height, int bitsPerPixel)    
// Change The Screen Resolution
{
    DEVMODE dmScreenSettings;                                            
// Device Mode
    ZeroMemory (&dmScreenSettings, sizeof (DEVMODE));                    
// Make Sure Memory Is Cleared
    dmScreenSettings.dmSize                = sizeof (DEVMODE);        
        // Size Of The Devmode Structure
    dmScreenSettings.dmPelsWidth        = width;                        
// Select Screen Width
    dmScreenSettings.dmPelsHeight        = height;                    
    // Select Screen Height
    dmScreenSettings.dmBitsPerPel        = bitsPerPixel;                
    // Select Bits Per Pixel
    dmScreenSettings.dmFields            = DM_BITSPERPEL | DM_PELSWIDTH 
| DM_PELSHEIGHT;
    if (ChangeDisplaySettings (&dmScreenSettings, CDS_FULLSCREEN) != 
DISP_CHANGE_SUCCESSFUL)
    {
        return FALSE;                                                    
// Display Change Failed, Return False
    }
    return TRUE;                                                        
// Display Change Was Successful, Return True
}


//*** to main()
    #ifdef ARWIN_CHANGEDISPLAY
        ChangeScreenResolution(ARWIN_DISPLAYWIDTH, ARWIN_DISPLAYHEIGHT,32);
    #endif
    [..]

    //start the main event loop
    #ifdef ARWIN_FULLSCREEN
        glutFullScreen();
    #endif
    atexit(cleanup);
    argMainLoop( mouseEvent, keyEvent, mainLoop );


//*** to init()
    DEVMODE currentDevmode;
    [..]
    /*glutGameModeString("800x600:16@6 .") ;

    if (glutGameModeGet(GLUT_GAME_MODE_WIDTH) != -1)  // if the width is 
different to -1
    {
        argInit( &cparam, 2 , 0, 0, 0, 0 );
        glutEnterGameMode()   ;        // enter full screen mode
    }else*/
   
    // open the graphics window (3rd parameter to 1 for fullscreen, very 
buggy!)
    // -> thus we use another way to make it fullscreen.

    // get current screendimensions
    if (EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &currentDevmode) )
    {
        // hardcoded for 320x240 cams, assuming that the display is 
horizontally oriented (4:3)
        #ifdef ARWIN_FULLSCREEN
            #ifdef ARWIN_CHANGEDISPLAY
                argInit( &cparam, ARWIN_DISPLAYWIDTH/(float)xsize , 0, 
0, 0, 0 );
            #else
                argInit( &cparam, 
currentDevmode.dmPelsWidth/(float)xsize , 0, 0, 0, 0 );
            #endif
        #else
            // windowed mode, 75% width, 75% height of screen
            argInit( &cparam, 
currentDevmode.dmPelsWidth/(float)xsize/1.5 , 0, 0, 0, 0 );
        #endif
    }else{
        // fullscreen not possible
        argInit( &cparam, 2 , 0, 0, 0, 0 );
    }

Hi,

To test this, I had the program to write to me the values of object.trans 
[0][3], [1][3] and [2][3]. With a fixed camera and the pattern in a fixed 
position it gave me a value, then with everything in it's fixed position 
when I cover the marker with my hand and uncover it, the program gives me a 
new position value that is completely diferent from the other before. I 
repeat this and it aways give me a diferent position. Why this happens, 
shouldn't the position values be the same since the camera and the pattern 
didn't move?

Thanks,
Bruno.

At 20:18 06-06-2003 +0200, you wrote:
>On Fri, 06 Jun 2003 16:49:05 +0100, Bruno <bruno@i .....> wrote:
>
>>Hi,
>>
>>Can someone tell me where I can get the pattern center position 
>>(coordinates)? I'd like to use this to calculate when too paterns are 
>>close to each other.
>>
>>Other question: What do I need to change to artoolkit show the video in 
>>full screen?
>>
>>Thanks,
>>Bruno Fernandes.
>>
>
>Hi!
>
>You can use the object.trans[3][4]-matrix to get easy to the center of the 
>marker:
>the fields [0][3], [1][3] and [2][3] are the tx, ty, tz 
>translation-values, which define the absolute position of your marker in 
>your openGl-world.
>
>to change ar-toolkit to fullscreen call your argInit() like this:
>
>double zoom = 2.0; // to scale the video-image, e.g. a 320x240-captured 
>image would now result in a
>                   // 640x480 glut-window
>int b_fullScreen = 1; // boolean, 0 = windowed, 1 = fullscreen
>
>    argInit( &cparam, zoom, b_fullScreen, 0, 0, 0 );
>
>// (the next three parameters are x,y-values and a flag for the use of an 
>head mounted display;
>//  don't bother)
>
>
>greetings,
>Toby.
>
>
>--
>- www.augmented.org -- www.footfighters.de -
>- My life for Aiur... uh, I mean Ner'zhul! -