Below you will find a simple conversion of HelloUniverse to render to
an offscreen canvas. It works well except for the fact that paint()
always shows the same face-on view of the colored cube. Why would the
interpolator not run just as if it was an on-screen canvas?
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import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.image.BufferedImage;
import javax.media.j3d.*;
import javax.swing.JComponent;
import javax.vecmath.Point3d;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
public class ThreeDPreview extends JComponent {
private final SimpleUniverse universe;
private final Canvas3D canvas;
public ThreeDPreview() {
GraphicsConfiguration config = SimpleUniverse
.getPreferredConfiguration();
canvas = new Canvas3D(config, true);
universe = new SimpleUniverse(canvas);
BufferedImage bufferedImage = new BufferedImage(300, 300,
BufferedImage.TYPE_INT_RGB);
ImageComponent2D imageComponent = new ImageComponent2D(
ImageComponent.FORMAT_RGBA, bufferedImage);
canvas.setOffScreenBuffer(imageComponent);
canvas.setOffScreenLocation(0, 0);
Screen3D screen = canvas.getScreen3D();
screen.setSize(1600, 1600);
screen.setPhysicalScreenWidth(0.5d);
screen.setPhysicalScreenHeight(0.5d);
BranchGroup scene = createSceneGraph();
universe.addBranchGraph(scene);
universe.getViewingPlatform().setNominalViewingTransform();
}
public void paint(Graphics g) {
canvas.renderOffScreenBuffer();
canvas.waitForOffScreenRendering();
g.drawImage(canvas.getOffScreenBuffer().getImage(), 0, 0, this);
}
public BranchGroup createSceneGraph() {
BranchGroup objRoot = new BranchGroup();
TransformGroup objTrans = new TransformGroup();
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objRoot.addChild(objTrans);
objTrans.addChild(new ColorCube(0.4));
// Create a new Behavior object that will perform the
// desired operation on the specified transform and add
// it into the scene graph.
Transform3D yAxis = new Transform3D();
Alpha rotationAlpha = new Alpha(-1, 4000);
RotationInterpolator rotator = new
RotationInterpolator(rotationAlpha,
objTrans, yAxis, 0.0f, (float) Math.PI * 2.0f);
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,
0.0, 0.0),
100.0);
rotator.setSchedulingBounds(bounds);
objRoot.addChild(rotator);
objRoot.compile();
return objRoot;
}
}
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