Hi Guillermo,
You have to transform the mouse coords into vworld coords. you can do it
like this:
//cursor position
Point3d imagePoint = new Point3d();
canvas3d.getPixelLocationInImagePlate(mouseX, mouseY,
imagePoint);
//transform coords into vworld
Transform3D trans = new Transform3D();
canvas3d.getImagePlateToVworld(trans);
trans.transform(imagePoint);
If you are interrested in the coordinates your mouse pointer has on the
surface of the geometry, you need a pickray starting from your eyes through
the mouse pointer to your geometry (normally -z direction).
You can do it for example this way:
//eye position
Point3d eyePos = new Point3d();
canvas3d.getCenterEyeInImagePlate(eyePos);
//cursor position
//mouseX, mouseY are the coords from the mouse event
Point3d imagePoint = new Point3d();
canvas3d.getPixelLocationInImagePlate(mouseX, mouseY,
imagePoint);
//transform points
Transform3D trans = new Transform3D();
canvas3d.getImagePlateToVworld(trans);
trans.transform(eyePos);
trans.transform(imagePoint);
Vector3d pickDir = new Vector3d();
pickDir.sub(imagePoint, eyePos);
PickRay pickRay = new PickRay();
pickRay.set(eyePos, pickDir);
Next, you need the distance to the geometry. You have to test for
intersection. Class Shape3D provides method
intersect(SceneGraphPath path, PickRay pickRay, double[] dist) to do this.
Gernot Veith
[EMAIL PROTECTED]
http://www.janet.de
> -----Original Message-----
> From: Guillermo E. Gutierrez [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, June 17, 1999 8:19 PM
> To: [EMAIL PROTECTED]
> Subject: Getting 3d coords from mouse click.
>
>
> Hello,
>
> I'm trying to get the 3d (world or scene--it doesn't matter)
> coordinates from a (mouse) picking operation. For example: I have a
> ColorCube located at the origin. I'm looking at it down the x axis.
> When I click on the center of the face I'm looking at, I want to get a
> Point3D with x=1, y=0, and z=0. Is there some easy built-in way to do
> this (via PickObject, for example), or do I have to manually get the
> object that I picked and do all the math? Put another way, I want the
> 3d coordinates of the mouse when I click on any geometry. (Obviously,
> it's impossible to tell depth when clicking on empty space.)
>
> Thanks.
> -guillermo
> [EMAIL PROTECTED]
> Software Engineer, Visualization IR&D
> Harris Corporation
>
>
