I am attaching a program that illustrates quite a number of problems I have
encountered in the last couple of days working with immediate-mode
rendering. There are three final variables (boolean immediate, int
textureMode and boolean silentCrash) that can be changed to bring to light
various issues. Edit and recompile as necessary.
Bug 1:
Make a selection from the Choice on top of the Applet to change the
TextureAttributes of the Sphere's Appearance. If boolean immediate = false,
the Appearance updates correctly. If boolean immediate = true there is no
response to the Event.
Bug2: (immediate = true)
Appearance of sphere affects appearance of ColorCube. Change int textureMode
between DECAL, MODULATE and BLEND recompiling each time to observe various
problems.
Bug 3 (immediate = true, textureMode = MODULATE):
Sphere looks blue. What happened? compare to immediate = false.
Bug 4 or possibly my confusion (immediate = true):
Desired behavior: stationary light with rotating sphere.
Actual behavior: Light rotates with sphere.
If this is the correct behavior, it's certainly unintuitive and I haven't
figured out a way to get the light to remain stationary. Perhaps someone
could help me out here.
Bug 5 (immediate = true, silentCrash = true)
It seems to matter when a light is added to a GraphicsContext3D. If added to
early, the program silently crashes. Set silentCrash = true to see the
program hang before it has even brought up a window.
Months ago, I wouldn't have considered using immediate mode. Later, I began
trying immediate mode to see if I could avoid some of J3D's rendering
problems by taking matters more into my own hands. But now it looks like
immediate mode is more buggy than normal mode. :-(
Dear Sun Java3D Team, I like Java3D a lot (I think). I'm looking forward to
1.2.1 and to its continuing improvement.
Raffi
/******Immediate.java*********/
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.image.*;
import java.awt.image.*;
public class Immediate extends Applet implements Runnable{
final boolean immediate = true;
final int textureMode =
TextureAttributes.BLEND;
//TextureAttributes.MODULATE;
//TextureAttributes.DECAL;
final boolean silentCrash = false;
Transform3D T = new Transform3D();
double theta = 0;
Canvas3D canvas;
GraphicsContext3D gc;
ColorCube cube;
Sphere sphere;
Shape3D sphereShape;
PointLight pl;
public void render() {
gc.clear();
T.set( new Vector3d( -0.3, 0, 0 ) );
gc.setModelTransform(T);
gc.draw(cube);
theta += 0.1;
T.rotY( theta );
T.setTranslation( new Vector3d( 0.3, 0, 0 ) );
gc.setModelTransform(T);
gc.draw(sphereShape);
canvas.swap();
}
public void run() {
while (true) {
if( pl == null ){
pl = new PointLight();
pl.setPosition( 0, 0, 10 );
gc.addLight( pl );
}
render();
Thread.yield();
}
}
public Immediate() {
setLayout(new BorderLayout());
canvas = new
Canvas3D(SimpleUniverse.getPreferredConfiguration());
add("Center", canvas);
SimpleUniverse u = new SimpleUniverse(canvas);
u.getViewingPlatform().setNominalViewingTransform();
gc = canvas.getGraphicsContext3D();
Appearance app = new Appearance();
app.setMaterial( new Material() );
BufferedImage bi = new BufferedImage( 1, 1,
BufferedImage.TYPE_INT_RGB );
Graphics g = bi.getGraphics();
g.setColor( Color.pink );
g.fillRect( 0, 0, 1, 1 );
ImageComponent2D im2D = new ImageComponent2D(
ImageComponent.FORMAT_RGB, bi );
Texture2D tex = new Texture2D( Texture.BASE_LEVEL,
Texture.RGB, 1, 1 );
tex.setImage( 0, im2D );
app.setTexture( tex );
final TextureAttributes ta = new TextureAttributes();
ta.setCapability( ta.ALLOW_MODE_WRITE );
ta.setTextureMode( textureMode );
app.setTextureAttributes( ta );
cube = new ColorCube(0.25);
sphere = new Sphere(0.25f, Primitive.GENERATE_NORMALS |
Primitive.GENERATE_TEXTURE_COORDS, app);
sphereShape = sphere.getShape();
final Choice choice = new Choice();
choice.addItemListener( new ItemListener(){
public void itemStateChanged( ItemEvent e ){
String s = choice.getSelectedItem();
if( s.equals( "BLEND" ) ){
ta.setTextureMode( ta.BLEND );
}else if( s.equals( "MODULATE" ) ){
ta.setTextureMode( ta.MODULATE );
}else if( s.equals( "DECAL" ) ){
ta.setTextureMode( ta.DECAL );
}
}
});
choice.addItem( "BLEND" );
choice.addItem( "MODULATE" );
choice.addItem( "DECAL" );
add( "North", choice );
if( immediate ){
canvas.stopRenderer();
if( silentCrash ){
pl = new PointLight();
pl.setPosition( 10, 0, 10 );
gc.addLight( pl );
}
new Thread(this).start();
}else{
BranchGroup BG = new BranchGroup();
BG.addChild( sphere );
PointLight pl = new PointLight();
pl.setPosition( 0, 0, 10 );
pl.setInfluencingBounds( new BoundingSphere() );
BG.addChild( pl );
u.addBranchGraph( BG );
}
}
public static void main(String[] args) {
new MainFrame(new Immediate(), 256, 256);
}
}
Immediate.java
