Hi,
I have a problem needed to solved.
Now I want to change the texture of a object, such as a Box.
First use class TextureLoader and getTexture() to get the Texture of texture0 and
texture1,as following:
TextureLoader texLoader=new TextureLoader("MyTextures\\flooring.jpg",this);
TextureLoader texLoader1=new TextureLoader("MyTextures\\floor-planks.jpg",this);
Texture texture=texLoader.getTexture();
Texture texture1=texLoader1.getTexture();
use as following code to set Texture of Appearance:
Appearance app=new Appearance();
PolygonAttributes pa=new PolygonAttributes();
pa.setCullFace(PolygonAttributes.CULL_NONE);
app.setCapability(app.ALLOW_TEXTURE_READ|app.ALLOW_TEXTURE_WRITE);
app.setPolygonAttributes(pa);
app.setTexture(texture0);
box=new Box(.2f,.15f,.15f,Box.GENERATE_NORMALS|Box.GENERATE_TEXTURE_COORDS,app);
...
then according to the event to change the texture of Box,the code is:
public void actionPerformed(ActionEvent e){
if(e.getSource()==bt1){ // bt1 is a button
app.setTexture(texture);
}
if(e.getSource()==bt2){ //bt2 is a button
app.setTexture(texture1);
}
}
but when I click the bt1 and bt2 give the messeage of error:
Exception occurred during event dispatching:
java.lang.NullPointerException
at java3d.Actionlisten.actionPerformed(Actionlisten.java:132)
at java.awt.Button.processActionEvent(Button.java:329)
at java.awt.Button.processEvent(Button.java:302)
at java.awt.Component.dispatchEventImpl(Component.java:2595)
at java.awt.Component.dispatchEvent(Component.java:2499)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:134)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)
Exception occurred during event dispatching:
java.lang.NullPointerException
at java3d.Actionlisten.actionPerformed(Actionlisten.java:143)
at java.awt.Button.processActionEvent(Button.java:329)
at java.awt.Button.processEvent(Button.java:302)
at java.awt.Component.dispatchEventImpl(Component.java:2595)
at java.awt.Component.dispatchEvent(Component.java:2499)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:134)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)
could yop tell me how to solve the question?
Thanks in advance.
Wu Fangsheng
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