"funny" stuff, the problem only appears after a SSM.showAll();
if after the show all i zoom out (or manipulate the view with the
trackball navigator) , it seems the 2d coordinates are correctly
computed.
any idea ? do i need to manually call an update for something ?
Stephane
>>> [EMAIL PROTECTED] 18/07/2008 11:39 >>>
Hi,
I'm trying to implement a "window select" (meaning that the 3d objects
are selected when the user drag a rectangle in the window).
for that, I'm projecting my object to the screen with
multFullMatrixPnt
and check if the projected object (in screencoord) intersect the
selection rectangle.
<pseudo-code>
void WindowSelect(int x1,int y1,int x2.int y2)
{
//x1,y1 and x2,y2 are the 2d mouse position on the select
rectangle in screen coordinates
ViewportPtr vp = getWindow()->getPort(0);
OSG::Matrix wtos;
getCamera()->getWorldToScreen(wtos,*vp);
int w = vp->getWidth();
int h = vp->getHeight();
foreach ( obj3d o in objList )
{
SphereVolume sph = o->GetSphereVolume();
Pnt3f center = sph.GetCenter(); //the center of the
sphere is on the center of the screen
Pnt3f projectedCenter ;
wtos.multFullMatrixPnt( center, projectedCenter );
//map the center to screen coordinates
//as the sphere center in in the middle of the screen,
I
expect projectedCenter[0] = 0 and projectedCenter[1] = 0
//but I got [0,1.66,0.93]
//as explained in
http://www.mail-archive.com/[email protected]/msg02156.html
float curXC = w*(projectedCenter [0]+1)/2.0f;
float curYC = h*(projectedCenter [1]+1)/2.0f;
if ( IsIn(curXC,curYC,x1,y1,x2,y2) )
{
obj3d->Select();
}
}
}
</pseudocode>
Do I do something wrong ?
thanks a lot,
Stephane
Stephane Routelous
[EMAIL PROTECTED]
Senior Software Specialist
Rowan Williams Davies & Irwin Inc. (RWDI)
Consulting Engineers & Scientists
650 Woodlawn Road West
Guelph, Ontario, Canada N1K 1B8
T (519) 823-1311 x2639
F (519) 823-1316
www.rwdi.com
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