coordinate confusion
I do not understand why the output of this code does not form a rectangle. It looks more like a large #.
I've pulled my hair out trying all sorts of combinations w/o luck.
What did I do wrong?
package java3dtest;
import com.sun.j3d.utils.geometry.Box;
import com.sun.j3d.utils.universe.SimpleUniverse;
import javax.media.j3d.*;
import javax.vecmath.*;
import javax.swing.JFrame;
import java.awt.*;
public class SampleProblem extends JFrame {
public SampleProblem() {
super("SampleProblem");
setLayout(new BorderLayout());
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas3D = new Canvas3D(config);
add("Center", canvas3D);
BranchGroup scene = createSceneGraph();
SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
simpleU.getViewingPlatform().setNominalViewingTransform();
simpleU.addBranchGraph(scene);
setSize(900, 900);
}
protected BranchGroup createSceneGraph() {
BranchGroup bg = new BranchGroup();
TransformGroup tg = new TransformGroup();
bg.addChild(tg);
TransparencyAttributes ta = new TransparencyAttributes();
ta.setTransparencyMode(ta.BLENDED);
ta.setTransparency(0.5f);
Appearance appearanceR = new Appearance();
Appearance appearanceG = new Appearance();
Appearance appearanceB = new Appearance();
Appearance appearanceY = new Appearance();
Material materialR = new Material(new Color3f(Color.lightGray),
new Color3f(Color.red), new Color3f(Color.gray),
new Color3f(Color.gray), 133);
Material materialG = new Material(new Color3f(Color.lightGray),
new Color3f(Color.green), new Color3f(Color.gray),
new Color3f(Color.gray), 133);
Material materialB = new Material(new Color3f(Color.lightGray),
new Color3f(Color.blue), new Color3f(Color.gray),
new Color3f(Color.gray), 133);
Material materialY = new Material(new Color3f(Color.lightGray),
new Color3f(Color.yellow), new Color3f(Color.gray),
new Color3f(Color.gray), 133);
appearanceR.setMaterial(materialR);
appearanceR.setTransparencyAttributes(ta);
appearanceG.setMaterial(materialG);
appearanceG.setTransparencyAttributes(ta);
appearanceB.setMaterial(materialB);
appearanceB.setTransparencyAttributes(ta);
appearanceY.setMaterial(materialY);
appearanceY.setTransparencyAttributes(ta);
addBox(new Point3f(78f, 0, 0f),
new Point3f(80f, 40f, 0f), tg, appearanceY); // right side
addBox(new Point3f(0, 0, 0),
new Point3f(2f, 40, 0f), tg, appearanceR); //left side
addBox(new Point3f(0, 0, 0),
new Point3f(80f, 2f, 0f), tg, appearanceG); // bottom
addBox(new Point3f(0, 38f, 0),
new Point3f(80f, 40f, 0f), tg, appearanceB); //top
bg.compile();
return bg;
}
protected void addBox(Point3f lowIn,
Point3f highIn,
TransformGroup tg,
Appearance appearance) {
Point3f low = convertPointToMeters(lowIn);
Point3f high = convertPointToMeters(highIn);
Point3f extents = new Point3f(high);
extents.sub(low);
Box b1 = new Box(extents.x,
extents.y,
extents.z,
Box.GENERATE_NORMALS,
appearance);
// origin = center of box, move it so lower left of box = low
float scale = .5f;
Vector3f v = new Vector3f(low.x + (scale * extents.x),
low.y + (scale * extents.y),
low.z + ( scale * extents.z));
Transform3D b1Xfm = new Transform3D();
b1Xfm.setTranslation(v);
TransformGroup b1Grp = new TransformGroup(b1Xfm);
b1Grp.addChild(b1);
tg.addChild(b1Grp);
}
public float convertInchesToMeters(float inch) {
return inch * 0.00254f;
}
public Point3f convertPointToMeters(Point3f p) {
return new Point3f(convertInchesToMeters(p.x),
convertInchesToMeters(p.y),
convertInchesToMeters(p.z));
}
public static void main(String[] args) {
Frame frame = new SampleProblem();
frame.setVisible(true);
}
}
