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Java 3D:making body parts move in an object model (.obj)
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Java
OpenGL
3D
Java8
I have been studying JOGL(Java OpenGL for several months now and have managed to load an object model, apply textures and rotate the object, without any animation in real time currently. I'm trying to use a Hashtable heirarchy or Map to map the object parts, in this case I'm using Map, but the .get method seems to return null. I am still learning the code structure, and I do not want to create lots of easily re-usable methods at this time, but want to use one uniform .jar file to execute a RotationInterpolator, Behavior, and possibly Node classes to make my wings move.

C#
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Frame;
import java.awt.GraphicsConfiguration;
import java.io.FileNotFoundException;
import java.util.Map;

import javax.media.j3d.Appearance;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.Material;
import javax.media.j3d.Shape3D;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3d;
import javax.vecmath.Vector3f;

import com.sun.j3d.loaders.IncorrectFormatException;
import com.sun.j3d.loaders.ParsingErrorException;
import com.sun.j3d.loaders.Scene;
import com.sun.j3d.loaders.objectfile.ObjectFile;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.universe.ViewingPlatform;

public class ObjectInteractive extends Frame {

	private static final long serialVersionUID = 819877942509843369L;

	/*
	 * IN ORDER TO LOAD THE OBJECT MODEL AFTER SEPARATING IT INTO LOOSE PARTS IN
	 * BLENDER, JAVA3D REQUIRES YOU TO OPEN THE OBJECT IN A TEXT EDITOR AND ADD
	 * "#" IN FRONT OF EVERY OBJECT "o". COMMAND F TO SEARCH FOR TEXT "o" AND
	 * ENTER TO CYCLE, UNLESS IT PROVIDES YOU WITH ARROW KEYS. MAKE SURE TO
	 * CHANGE THE FILE EXTENSION BACK TO .obj, ON MAC OS X YOU HAVE TO RIGHT
	 * CLICK>GET INFO
	 * 
	 * eg.
	 * 
	 * o gargoyle <------wrong
	 * 
	 * # o gargoyle <------right
	 */

	{

		GraphicsConfiguration graphicsConfigI = SimpleUniverse
				.getPreferredConfiguration();

		setLayout(new BorderLayout());
		setTitle("Heavy Evil - Act I");
		Canvas3D canvas3DI = new Canvas3D(graphicsConfigI);
		canvas3DI.setSize(1200, 800);
		canvas3DI.setVisible(true);
		canvas3DI.setBackground(Color.BLACK);

		add(canvas3DI);

		ObjectFile loaderI = new ObjectFile(ObjectFile.LOAD_ALL);
		loaderI.setFlags(ObjectFile.RESIZE);

		Shape3D modelI = new Shape3D();
		Scene modelSceneI = null;

		try {
			modelSceneI = loaderI.load("Images/untitled.obj/");
			modelI = (Shape3D) modelSceneI.getSceneGroup().getChild(0);
			modelSceneI.getSceneGroup().removeChild(0);
			modelI.getAppearance().getMaterial();

		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IncorrectFormatException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ParsingErrorException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		BranchGroup root = modelSceneI.getSceneGroup();
		root.setCapability(BranchGroup.ALLOW_CHILDREN_EXTEND);
		root.setCapability(BranchGroup.ALLOW_CHILDREN_WRITE);

		root.removeAllChildren();

		Color3f light1Color = new Color3f(1.8f, 0.1f, 0.1f);

		BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
				100.0);

		Vector3f light1Direction = new Vector3f(2.0f, 12.0f, -12.0f);

		DirectionalLight light1

		= new DirectionalLight(light1Color, light1Direction);

		light1.setInfluencingBounds(bounds);

		root.addChild(light1);

		Transform3D transform = new Transform3D();
		transform.lookAt(new Point3d(0, 0, 4), new Point3d(0, 0, 0),
				new Vector3d(0, 1, 0));
		transform.invert();

		/* Creates rotation transforms for x, y and z axis */
		Transform3D rotateX = new Transform3D();
		Transform3D rotateY = new Transform3D();
		Transform3D rotateZ = new Transform3D();

		rotateX.rotX(30d); // +30 degrees on the X axis
		rotateY.rotY(30d); // +30 degrees on the Y axis
		rotateZ.rotZ(-15d); // or something
		transform.mul(rotateX, rotateY);
		transform.mul(transform, rotateZ);

		root.addChild(modelI);

		@SuppressWarnings("unchecked")
		Map<String, Shape3D> nameMap = modelSceneI.getNamedObjects();

		for (String groups : nameMap.keySet()) {
			System.out.printf("Name: %s\n", groups);
		}

		for (String gargoyle : nameMap.keySet()) {
			System.out.printf("Name: %s\n", gargoyle);
		}
		for (String wings : nameMap.keySet()) {
			System.out.printf("Name: %s\n", wings);
		}
		for (String box : nameMap.keySet()) {
			System.out.printf("Name: %s\n", box);
		}
		for (String teeth : nameMap.keySet()) {
			System.out.printf("Name: %s\n", teeth);
		}
		for (String eyes : nameMap.keySet()) {
			System.out.printf("Name: %s\n", eyes);
		}
		for (String object : nameMap.keySet()) {
			System.out.printf("Name: %s\n", object);
		}
		for (String bar : nameMap.keySet()) {
			System.out.printf("Name: %s\n", bar);
		}
		for (String hornOther : nameMap.keySet()) {
			System.out.printf("Name: %s\n", hornOther);
		}

		TransformGroup groups = new TransformGroup(transform);
		TransformGroup gargoyle = new TransformGroup();
		TransformGroup teeth = new TransformGroup();
		TransformGroup wings = new TransformGroup();
		TransformGroup eyes = new TransformGroup();
		TransformGroup object = new TransformGroup();
		TransformGroup bar = new TransformGroup();
		TransformGroup box = new TransformGroup();
		TransformGroup hornOther = new TransformGroup();

		object.addChild(nameMap.get("Object01"));
		bar.addChild(nameMap.get("cone"));
		box.addChild(nameMap.get("box"));
		eyes.addChild(nameMap.get("eye_left"));
		eyes.addChild(nameMap.get("eye_right"));
		gargoyle.addChild(nameMap.get("gargoyle"));
		hornOther.addChild(nameMap.get("gargoyle.001"));
		hornOther.addChild(nameMap.get("gargoyle.002"));
		wings.addChild(nameMap.get("gargoyle.003"));
		wings.addChild(nameMap.get("gargoyle.004"));
		teeth.addChild(nameMap.get("gargoyle.005"));
		teeth.addChild(nameMap.get("gargoyle.006"));
		teeth.addChild(nameMap.get("gargoyle.007"));
		teeth.addChild(nameMap.get("gargoyle.008"));
		teeth.addChild(nameMap.get("gargoyle.009"));
		teeth.addChild(nameMap.get("gargoyle.010"));
		teeth.addChild(nameMap.get("gargoyle.011"));
		teeth.addChild(nameMap.get("gargoyle.012"));
		teeth.addChild(nameMap.get("gargoyle.013"));
		teeth.addChild(nameMap.get("gargoyle.014"));
		teeth.addChild(nameMap.get("gargoyle.015"));
		teeth.addChild(nameMap.get("gargoyle.016"));
		teeth.addChild(nameMap.get("gargoyle.017"));
		teeth.addChild(nameMap.get("gargoyle.018"));
		teeth.addChild(nameMap.get("gargoyle.019"));
		teeth.addChild(nameMap.get("gargoyle.020"));
		teeth.addChild(nameMap.get("gargoyle.021"));
		teeth.addChild(nameMap.get("gargoyle.022"));
		teeth.addChild(nameMap.get("gargoyle.023"));
		teeth.addChild(nameMap.get("gargoyle.024"));
		teeth.addChild(nameMap.get("gargoyle.025"));
		teeth.addChild(nameMap.get("gargoyle.026"));
		teeth.addChild(nameMap.get("gargoyle.027"));
		teeth.addChild(nameMap.get("gargoyle.028"));
		teeth.addChild(nameMap.get("gargoyle.029"));
		teeth.addChild(nameMap.get("gargoyle.030"));
		teeth.addChild(nameMap.get("gargoyle.031"));
		teeth.addChild(nameMap.get("gargoyle.032"));
		teeth.addChild(nameMap.get("gargoyle.033"));
		teeth.addChild(nameMap.get("gargoyle.034"));
		teeth.addChild(nameMap.get("gargoyle.035"));
		teeth.addChild(nameMap.get("gargoyle.036"));
		teeth.addChild(nameMap.get("gargoyle.037"));
		teeth.addChild(nameMap.get("gargoyle.038"));
		teeth.addChild(nameMap.get("gargoyle.039"));
		teeth.addChild(nameMap.get("gargoyle.040"));
		teeth.addChild(nameMap.get("gargoyle.041"));
		teeth.addChild(nameMap.get("gargoyle.042"));
		teeth.addChild(nameMap.get("gargoyle.043"));
		teeth.addChild(nameMap.get("gargoyle.044"));
		teeth.addChild(nameMap.get("gargoyle.045"));
		teeth.addChild(nameMap.get("gargoyle.046"));
		teeth.addChild(nameMap.get("gargoyle.047"));
		teeth.addChild(nameMap.get("gargoyle.048"));
		teeth.addChild(nameMap.get("gargoyle.049"));
		teeth.addChild(nameMap.get("gargoyle.050"));
		teeth.addChild(nameMap.get("gargoyle.051"));
		teeth.addChild(nameMap.get("gargoyle.052"));
		teeth.addChild(nameMap.get("gargoyle.053"));
		teeth.addChild(nameMap.get("gargoyle.054"));
		teeth.addChild(nameMap.get("gargoyle.055"));
		teeth.addChild(nameMap.get("gargoyle.056"));

		@SuppressWarnings("unchecked")
		Shape3D wingz = (Shape3D) modelSceneI.getNamedObjects().getOrDefault(
				"gargoyle.003", modelI);

		// NamedObject returns null, need to map Hashtable

		Appearance appear = new Appearance();

		Material mat = new Material();
		mat.setAmbientColor(0f, 0f, 5f);
		mat.setDiffuseColor(0f, 0f, 5f);
		mat.setLightingEnable(true);
		appear.setMaterial(mat);
		wingz.setAppearance(appear);

		/* Add completed scenegraph, Construct the groups */

		groups.addChild(gargoyle);
		gargoyle.addChild(wings);
		gargoyle.addChild(teeth);
		gargoyle.addChild(eyes);
		gargoyle.addChild(object);
		gargoyle.addChild(bar);
		gargoyle.addChild(hornOther);
		gargoyle.addChild(box);

		groups.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		groups.setCapability(TransformGroup.ALLOW_CHILDREN_EXTEND);
		gargoyle.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		gargoyle.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
		gargoyle.setCapability(TransformGroup.ALLOW_CHILDREN_EXTEND);

		wings.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		wings.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);

		teeth.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		eyes.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		object.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		bar.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		hornOther.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		box.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

		// INSERT TRANSFORMS OR JAVA VECTOR UTILS

		Vector3d vecs = new Vector3d();
		transform.rotY(0.1d);
		vecs.setZ(3.0d);

		transform.setTranslation(vecs);

		SimpleUniverse universeI = new SimpleUniverse(canvas3DI);
		universeI.getViewingPlatform().setNominalViewingTransform();

		ViewingPlatform viewPlatformI = universeI.getViewingPlatform();

		TransformGroup viewTransformI = viewPlatformI
				.getViewPlatformTransform();

		viewTransformI.setTransform(transform);
		universeI.addBranchGraph(root);

	}

	public static void main(String[] args) {

		ObjectInteractive frameObj = new ObjectInteractive();
		frameObj.setSize(1200, 800);
		frameObj.setVisible(true);

	}

}


What I have tried:

I have gone through the object file with a text editor and edited all of my separate parts to Java 3D specs which are to add a # in front of all of the object parts with the line preceded by an "o", until all of the errors went away. Everything works fine. My getOrDefault method always applies the texture to the entire file, so there is something wrong in my code where the .get is not properly processing the object parts. Google and Java3D tutorials are not making any sense, and most of which do not touch on animation using object file segments. I'm also not sure what those for loops are accomplishing if anything. They may be used for using segments multiple times.

I added the rotation behavior finally via mouse drag but I still cannot map the wings etc. correctly.

C#
OrbitBehavior orbit = new OrbitBehavior(canvas3DI,
				OrbitBehavior.REVERSE_ALL);
orbit.setSchedulingBounds(bounds);
orbit.setRotateEnable(true);
orbit.setRotXFactor(5d);

viewPlatformI.setViewPlatformBehavior(orbit);
Posted
Updated 12-Oct-16 14:51pm
v2
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1 solution

You should learn to use the debugger as soon as possible. Rather than guessing what your code is doing, It is time to see your code executing and ensuring that it does what you expect.

The debugger allow you to follow the execution line by line, inspect variables and you will see that there is a point where it stop doing what you expect.
Debugger - Wikipedia, the free encyclopedia[^]
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jdb.html[^]
https://www.jetbrains.com/idea/help/debugging-your-first-java-application.html[^]

The debugger is here to show you what your code is doing and your task is to compare with what it should do.
 
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