Have a good look at the tutorial/FAQ and I believe you should be able to
solve your problems
in the following way:
>I have to write a project with Java3D, but there are some unclearly
>things, for ex. I need to add (with the mouse) a new piece ( a new object )
>to a created model ( in position (x,y,z) ).
> - How can the cursor coordinates be asked ? Or are there any other
> possibilities to solve this problem ?
There are whole set of method to do this:
in the following, I use the code to give the x/y position of my mouse
pointer in a bird eye view of the scene
This should give you some ideas to follow
####################333
>From your mouse event:
/**
* Takes the x and y coordinates from the provided mouse event and
* determines the corresponding point in the virtual world.
*
* @param evt The Mouse Event for which the point is desired
* @return Point3d a virtual world point corresponding to the Mouse
Event's
* x and y coordinates on the canvas.
*/
public Point3d getCanvasPtToVworldPt(MouseEvent e) {
return getCanvasPtToVworldPt(e.getX(), e.getY());
}
with
/**
* determines a corresponding virtual world point given a canvas point.
*
* @param Point3d the point on the canvas
* @return Point3d a virtual world point corresponding to the canvas
point
* provided.
*/
public Point3d getCanvasPtToVworldPt(int x, int y) {
// convert the canvas point to ImagePlate coords
getPixelLocationInImagePlate(x, y, VworldPt);
// transform the point from an imageplate coordinate to a Vworld
// coordinate
getImagePlateToVworld(imagePlateToVworld);
imagePlateToVworld.transform(VworldPt);
getCenterEyeInImagePlate(centerEyePt);
imagePlateToVworld.transform(centerEyePt);
file://Logging.trace(10, "Center eye pt VW " + centerEyePt);
file://now compute the z=0 value in the centereye to VworldPt pt
file://centerEyePt_VworldPt = alpha *centerEyePt_planePt with
planePt.z=0
double alpha = 0.0;
if ( VworldPt.z != centerEyePt.z ) {
alpha = centerEyePt.z /(VworldPt.z - centerEyePt.z);
}
Point3d planePt =
new Point3d( centerEyePt.x - alpha *(VworldPt.x -
centerEyePt.x),
centerEyePt.y - alpha *(VworldPt.y -
centerEyePt.y),
0.0);
return planePt;
}
###############
Please note that I do not care about the z value here
Another way is to pick the point (see FAQ/archive) and so directly get the
xyz picked upon
>
>I load an object, but I know nothing about it. I want to put this object in
>a smallest possible rectangle (so I want to discover its width, height and
>depth ).
> - How can I do this ?
just get its bounds!!!!
see FAQ/etc about this
Cheers
--
Olivier Fillon Minestar Project
[EMAIL PROTECTED] Mincom Limited
Ph.+61-7-3303-3344 61 Wyandra Street
Fax+61-7-3303-3232 Teneriffe Qld. 4005.
Australia
Company home page: http://www.mincom.com/
Personal home page: http://www.home.gil.com.au/~fillon
--
===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff JAVA3D-INTEREST". For general help, send email to
[EMAIL PROTECTED] and include in the body of the message "help".
