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How to create a correct object model transformation in java3d?
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I have an object model(.obj) loaded, and have created a Map to list the internal objects of the file that I have separated into parts using Blender, and call them to create rotations. I did see some kind of movement, but only once and it could've just been a glitch. Once I can create movement, I can easily tweak the math involved, but I can't get movement so far and I fear my code may need a few adjustments. I'm thinking it's something small that I'm just glancing past.

The object model loads correctly from the separated model with no errors.

Java
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.Alpha;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.RotPosPathInterpolator;
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.Point3f;
import javax.vecmath.Quat4f;
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 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
	 * 
	 * 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();
		}

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

		Shape3D wings3d = nameMap.get("wings");

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

		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);

		TransformGroup transformGroup = new TransformGroup();

		transformGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		transformGroup.setCapability(TransformGroup.ALLOW_CHILDREN_EXTEND);
		transformGroup.addChild(wings3d);

		Transform3D transforms = new Transform3D();

		/* Creates rotation transforms for x, y and z axis */
		Transform3D rotX = new Transform3D();
		Transform3D rotY = new Transform3D();
		Transform3D rotZ = new Transform3D();

		rotX.rotX(15f); // +15 degrees on the X axis
		rotY.rotY(30f); // +30 degrees on the Y axis
		rotZ.rotZ(-20f); // -20 degrees on the Z axis

		/* Combines all rotation transforms */
		transforms.mul(rotX, rotY);
		transforms.mul(transforms, rotZ);

		/* Translation: translates 2 on X, 3 on Y and -10 on Z */
		Vector3f translationVector = new Vector3f(2F, 3F, -1F);
		transforms.setTranslation(translationVector);

		/* Non uniform scaling: scales 3x on X, 1x on Y and 2x on Z */
		Vector3d scale = new Vector3d(0D, 0D, 0D);
		transforms.setScale(scale);

		/* Apply all transformations */

		TransformGroup wings = new TransformGroup();
		TransformGroup teeth = new TransformGroup();
		TransformGroup gargoyle = new TransformGroup();
		TransformGroup eyes = new TransformGroup();
		TransformGroup object = new TransformGroup();
		TransformGroup bar = new TransformGroup();
		TransformGroup box = new TransformGroup();
		TransformGroup hornOther = new TransformGroup();
		transformGroup.addChild(gargoyle);
		gargoyle.addChild(wings3d);

		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"));
		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"));

		/* Construct the groups */

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

		root.addChild(modelI);
		root.addChild(transformGroup);

		Transform3D t3dI = new Transform3D();
		t3dI.lookAt(new Point3d(0, 0, 4), new Point3d(0, 0, 0), new Vector3d(0,
				1, 0));
		t3dI.invert();

		Alpha alphaNave = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0, 6000, 0,
				0, 0, 0, 0);

		float[] alphas = { 0.0f, 0.25f, 0.50f, 0.75f, 1.0f };
		Quat4f[] quats = new Quat4f[5];
		Point3f[] positions = new Point3f[5];

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

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

		quats[0] = new Quat4f(0.0f, 1.0f, 0.0f, (float) Math.toRadians(0));
		quats[1] = new Quat4f(0.0f, 1.0f, 0.0f, (float) Math.toRadians(90));
		quats[2] = new Quat4f(0.0f, 1.0f, 0.0f, (float) Math.toRadians(180));
		quats[3] = new Quat4f(0.0f, 1.0f, 0.0f, (float) Math.toRadians(270));
		quats[4] = quats[0];

		positions[0] = new Point3f(-20.0f, 0.0f, 20.0f);
		positions[1] = new Point3f(-20.0f, 0.0f, -20.0f);
		positions[2] = new Point3f(20.0f, 0.0f, -20.0f);
		positions[3] = new Point3f(20.0f, 0.0f, 20.0f);
		positions[4] = positions[0];

		RotPosPathInterpolator rotPosPath = new RotPosPathInterpolator(
				alphaNave, wings, t3dI, alphas, quats, positions);
		gargoyle.addChild(rotPosPath);

		transforms.rotX(Math.PI / 2.f);

		rotPosPath.setSchedulingBounds(bounds);

		root.compile();

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

		ViewingPlatform viewPlatformI = universeI.getViewingPlatform();

		TransformGroup viewTransformI = viewPlatformI
				.getViewPlatformTransform();

		viewTransformI.setTransform(t3dI);
		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 the following error, as the program is left running.

Java
Sep  6 00:55:10 B34T-T3CHN1C14N.local java[760] <error>: CGContextSetBaseCTM: invalid context 0x0
Sep  6 00:56:10 B34T-T3CHN1C14N.local java[760] <error>: CGContextGetCTM: invalid context 0x0
Sep  6 00:56:10 B34T-T3CHN1C14N.local java[760] <error>: CGContextSetBaseCTM: invalid context 0x0
Sep  6 00:56:13 B34T-T3CHN1C14N.local java[760] <error>: CGContextGetCTM: invalid context 0x0
Sep  6 00:56:13 B34T-T3CHN1C14N.local java[760] <error>: CGContextSetBaseCTM: invalid context 0x0
Sep  6 00:57:25 B34T-T3CHN1C14N.local java[760] <error>: CGContextGetCTM: invalid context 0x0
Sep  6 00:57:25 B34T-T3CHN1C14N.local java[760] <error>: CGContextSetBaseCTM: invalid context 0x0
Sep  6 00:57:29 B34T-T3CHN1C14N.local java[760] <error>: CGContextGetCTM: invalid context 0x0
Sep  6 00:57:29 B34T-T3CHN1C14N.local java[760] <error>: CGContextSetBaseCTM: invalid context 0x0


I've tried to move the rotation below the SimpleUniverse creation but to no avail. I've built the code from the bottom up and created the ObjectLoader as well. Please feel free to look at my github.

https://github.com/GettingNifty/Heavy-Evil

I'm currently reading Foundations of Graphics Programming:In JOGL and Java 3D and after having finished the book, it doesn't really touch on Hierarchical model transformations. I'm using the following tutorial.

http://www.daltonfilho.com/articles/java3d/
Posted
Updated 6-Sep-16 6:54am
v4
Add a Solution

1 solution

The solution was to simply move my Transform3D t3dI up below my Transform3D transforms, delete the t3dI instance as I accidentally created a duplicate and change all instances of t3dI to transforms. Finally on my way.
 
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Posted
Updated 6-Sep-16 7:07am
v2
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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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