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1  Java Game APIs & Engines / Java 3D / Re: Best solution to display 2D layer on top of 3D scene on: 2012-05-09 13:06:39
Hello Antoine,

I tried what you said and it works. The Text2D is just a little bit blinking but it doesn't matter.

Thanks / merci

But I see a strange effect.

The z offset of my Text2DBranchGroup is -2
In my scene, there is a tree at z = -50

The Text2D in the Text2DBranchGroup is displayed on top of tree trunc, ok, but the tree leafs (transparent texture) are displayed on top Text2D  !

It seems there is a z-buffer bug between 3D scene and PlatformGeometry.

Maybe is it related to my clipping ?

mainView.setFrontClipDistance(0.4f);
mainView.setBackClipDistance(1200.0f);

I need these values to display near objects and very far away ones.

Any idea ?

Thanks
2  Java Game APIs & Engines / Java 3D / Best solution to display 2D layer on top of 3D scene on: 2012-05-09 11:15:12
Hello,

I write a little Java3D program and I need to display a 2D layer on top of my 3D scene with

- dynamic stats (FPF, memory usage, ...)
- dynamic hour (rendered as an analog watch).

I searched on the web and I think I would use a PlatformGeometry

So, I created the following structure

PlatformGeometry => TransformGroup => BranchGroup => Text2D

But I have to create/update the Text2D on every frame.

When I try to do that (add a Text2D as a Child of the BranchGroup), I get an error

javax.media.j3d.RestrictedAccessException: Group: only a BranchGroup node may be added

I get an equivalent error when I try to remove previous Text2D child from the BranchGroup.

I think I gave the needed capabilities to the BranchGroup.

_statsBG.setCapability(BranchGroup.ALLOW_CHILDREN_EXTEND);
_statsBG.setCapability(BranchGroup.ALLOW_CHILDREN_WRITE);


I also see I can remove the BranchGroup from the TransformGroup without getting any error. But, I don't think it's efficient on every frame to

- remove '2D stats' BranchGroup from '2D stats' TransformGroup
- create new '2D stats' BranchGroup
- create new Text2D and add it as child to '2D stats' BranchGroup
- add new '2D stats' BranchGroup to the '2D stats' TransformGroup.

So, what is the best solution ?

Thanks for all.

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