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2 replies [Last post]
Joined: 2010-12-09

Hey all! I was hoping I could find some help here at

Here is the problem: I'm trying to create an application where I can select a point on the canvas3D,convert the coordinates to the 3D virtual world, then use PointArray to add a point at the spot I clicked. However... I'm running into some issues.
So far I can obtain the virtual world coordinates by clicking the canvas3D, but I'm not sure how to add the point. I've been looking into using Geometry By-Reference to see if this could solve the problem-- and I think it will-- but I'm not sure how I can modify the geometry after runtime.
Currently, I believe I need to create a PointArray object using the "BY_REFERENCE" flag and enabling the proper capabilities: ALLOW_REF_DATA_READ and ALLOW_REF_DATA_WRITE. I also have a capability set to a Shape3D: ALLOW_GEOMETRY_WRITE. I'm not sure if I need the ALLOW_COUNT_WRITE capability for the PointArray object.
So I used these ideas and tried to increment the amount of indices the PointArray is using based on how many clicks I make to the cavas3D.

public void mouseReleased(MouseEvent e)
//get the 3D coordinate
createPoint(objRoot, numPoints); //objRoot is the BranchGroup object

createPoint() changes the data for the PointArray accordingly, but I get an error when I add the my Shape3D object to the BranchGroup. Also, I'm not sure if i need to do anything with the GeometryUpdater class. All help is appreciated, and thanks for taking your time to read this.

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Joined: 2010-12-09

I got it working :)

Joined: 2010-08-06

Will you please tell me how you are fetching cordinate at some point of universe using mouse operation?