After refreshing my memory by reading the spec, I am going to
change my answer. :^) The setTextureUnitState(int, TextureUnitState)
form may only be used once the length of the TextureUnitState array
has been established. The length of that array is established with the
setTextureUnitState(TextureUnitState[]) form. So, there is no bug here.
Doug Twilleager
Java 3D Team
Sun Microsystems
>Subject: [JAVA3D] Problem with TextureUnitState
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>Hi group,
>
>I'm trying to use TextureUnitState in an Appearance to apply
>different Textures to different parts of the Geometry contained
>in only one Shape3D.
>
>My code is as follows:
>
> /**
> * Returns the Appearance for a house containing 2 Textures,
> * one for the 4 walls, the other for the roof.
> */
> protected Appearance getHouseAppearance() {
> if (houseAppearance == null) {
> houseAppearance = new Appearance();
> TextureUnitState tus = new TextureUnitState();
> tus.setTexture(getTexture("facade.gif"));
> // the texture IS returned, definitely
> houseAppearance.setTextureUnitState(0, tus); // <=====
> tus = new TextureUnitState();
> tus.setTexture(getTexture("roof.gif"));
> houseAppearance.setTextureUnitState(1, tus);
> }
> return houseAppearance;
> }
>
>However, at the marked line of code, I get this exception:
>
>java.lang.NullPointerException
> at
javax.media.j3d.AppearanceRetained.setTextureUnitState(AppearanceRetained.java:6
65)
> at javax.media.j3d.Appearance.setTextureUnitState(Appearance.java:687)
> at Zoom.getHouseAppearance(Zoom.java:310)
> at Zoom.createHouse(Zoom.java:298)
> at Zoom.createCity(Zoom.java:144)
> at Zoom.createSceneGraph(Zoom.java:118)
> at Zoom.init(Zoom.java:435)
> at com.sun.j3d.utils.applet.JMainFrame.run(JMainFrame.java:180)
> at java.lang.Thread.run(Thread.java:536)
>
>What am I doing wrong?
>
>Or might this be a bug in J3D 1.3 beta2?
>
>regards
>
>Georg
> ___ ___
>| + | |__ Georg Rehfeld Woltmanstr. 12 20097 Hamburg
>|_|_\ |___ [EMAIL PROTECTED] +49 (40) 23 53 27 10
>
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