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  Hide Sphere -- How to?  (Read 2252 times)
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Offline jiapei100

Junior Member





« Posted 2009-12-16 03:36:28 »


Hi, all:

I created a Sphere
1  
sphs = new Sphere(0.02f, someAppearance);


In my application, I would like there is a "switch" to display or to hide this Sphere.

But, how to hide a Sphere?
Or, how to set this Sphere 100% transparent?


Please help.

Best Regards
JIA





Welcome to Vision Open
http://www.visionopen.com
Offline Eli Delventhal

JGO Kernel


Medals: 42
Projects: 11


Game Engineer


« Reply #1 - Posted 2009-12-16 07:25:25 »

Just don't draw it.

Smiley

Or if you want it to be transparent (waste) set the 3D color's alpha to 0.

See my work:
OTC Software
Offline tom
« Reply #2 - Posted 2009-12-16 08:44:12 »

You can add it to a Switch node. Then use setWhichChild(Switch.CHILD_ALL) to show it and setWhichChild(Switch.CHILD_NONE) to hide.

Setting the alpha to 0 will probably be slower since the sphere will still be rendered. Another difference is that using a Switch will disable picking on the hidden children.

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Offline jiapei100

Junior Member





« Reply #3 - Posted 2009-12-16 09:08:32 »


Hi, do you mean that
a Sphere is able to inherit setWhichChild method?

I tried but error reported:

1  
2  
Sphere sphs;
sphs.setWhichChild(Switch.CHILD_NONE);



So, any further suggestions?

Rgds
JIA


You can add it to a Switch node. Then use setWhichChild(Switch.CHILD_ALL) to show it and setWhichChild(Switch.CHILD_NONE) to hide.

Setting the alpha to 0 will probably be slower since the sphere will still be rendered. Another difference is that using a Switch will disable picking on the hidden children.

Welcome to Vision Open
http://www.visionopen.com
Offline tom
« Reply #4 - Posted 2009-12-16 13:48:58 »

No!

1  
2  
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Sphere sphere = new Sphere(...);
Switch visibleSwitch = new Switch();
visibleSwitch.addChild(sphere);
visibleSwitch.setWhichChild(Switch.CHILD_NONE);

Offline jiapei100

Junior Member





« Reply #5 - Posted 2009-12-16 13:58:45 »


Thanks very much.

However, what's the relationship between a Switch and the TransformGroup/BranchGroup/Universe?

Because my Sphere sphere is in a TransformGroup, and then a BranchGroup, which is finally shown in the Universe.
How to organize the Switch visibleSwitch and my TransformGroup/BranchGroup/Universe?

Cheers
JIA


1  
2  
3  
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Sphere sphere = new Sphere(...);
Switch visibleSwitch = new Switch();
visibleSwitch.addChild(sphere);
visibleSwitch.setWhichChild(Switch.CHILD_NONE);


Welcome to Vision Open
http://www.visionopen.com
Offline tom
« Reply #6 - Posted 2009-12-16 17:34:19 »

1  
2  
//myTG.addChild(sphere)
myTG.addChild(sphereSwitch);


Switch inherits from Group.

You should read up on how the scenegraph works. Might be something about in the Java3D totorials:

http://java.sun.com/developer/onlineTraining/java3d/

Offline jiapei100

Junior Member





« Reply #7 - Posted 2009-12-16 20:13:02 »


Hi, Thanks. problem solved.

Cheers
JIA

Welcome to Vision Open
http://www.visionopen.com
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