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How to use clip planes E-mail
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This Java tip draws a cylinder and creates two clip planes to see the interior of the cylinder.


Image

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;

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.ModelClip;
import javax.media.j3d.PolygonAttributes;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3f;
import javax.vecmath.Vector4d;

import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.behaviors.mouse.MouseRotate;
import com.sun.j3d.utils.behaviors.mouse.MouseZoom;
import com.sun.j3d.utils.geometry.Cylinder;
import com.sun.j3d.utils.universe.SimpleUniverse;

/**
 * ModelClipTest draws a cylinder and creates two clip planes to see the
 * interior of the cylinder.
 */
public class ModelClipTest extends Applet {

  private SimpleUniverse u = null;

  public BranchGroup createSceneGraph() {
    // Create the root of the branch graph
    BranchGroup objRoot = new BranchGroup();

    BoundingSphere bounds = new BoundingSphere(new Point3d(0.00.00.0),
        100.0);

    // Create a Transformgroup to scale all objects so they
    // appear in the scene.
    TransformGroup objScale = new TransformGroup();
    Transform3D t3d = new Transform3D();
    t3d.setScale(0.4);
    objScale.setTransform(t3d);
    objRoot.addChild(objScale);

    // This Transformgroup is used by the mouse manipulators to
    // move the CYlinder.
    TransformGroup objTrans = new TransformGroup();
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    objScale.addChild(objTrans);

    //Create Model Clip
    ModelClip mc = new ModelClip();
    boolean enables[] false, false, false, false, false, false };
    Vector4d eqn1 = new Vector4d(0.01.00.00.0);
    Vector4d eqn2 = new Vector4d(1.01.00.00.0);
    mc.setEnables(enables);
    mc.setPlane(1, eqn1);
    mc.setPlane(2, eqn2);
    mc.setEnable(1true);
    mc.setEnable(2true);
    mc.setInfluencingBounds(bounds);
    objTrans.addChild(mc);

    //Create a cylinder
    PolygonAttributes attr = new PolygonAttributes();
    attr.setCullFace(PolygonAttributes.CULL_NONE);
    Appearance ap = new Appearance();
    Material mat = new Material();
    mat.setLightingEnable(true);
    ap.setMaterial(mat);
    ap.setPolygonAttributes(attr);

    Cylinder CylinderObj = new Cylinder(1.0f2.0f, ap);
    objTrans.addChild(CylinderObj);

    // Create the rotate behavior node
    MouseRotate behavior = new MouseRotate(objTrans);
    objTrans.addChild(behavior);
    behavior.setSchedulingBounds(bounds);

    // Create the zoom behavior node
    MouseZoom behavior2 = new MouseZoom(objTrans);
    objTrans.addChild(behavior2);
    behavior2.setSchedulingBounds(bounds);

    //Shine it with two colored lights.
    Color3f lColor1 = new Color3f(0.5f0.0f0.5f);
    Color3f lColor2 = new Color3f(0.7f0.7f0.0f);
    Vector3f lDir1 = new Vector3f(-1.0f, -1.0f1.0f);
    Vector3f lDir2 = new Vector3f(0.0f0.0f, -1.0f);
    DirectionalLight lgt1 = new DirectionalLight(lColor1, lDir1);
    DirectionalLight lgt2 = new DirectionalLight(lColor2, lDir2);
    lgt1.setInfluencingBounds(bounds);
    lgt2.setInfluencingBounds(bounds);
    objScale.addChild(lgt1);
    objScale.addChild(lgt2);

    // Let Java 3D perform optimizations on this scene graph.
    objRoot.compile();

    return objRoot;
  }

  public ModelClipTest() {
  }

  public void init() {
    setLayout(new BorderLayout());
    GraphicsConfiguration config = SimpleUniverse
        .getPreferredConfiguration();

    Canvas3D c = new Canvas3D(config);
    add("Center", c);

    // Create a simple scene and attach it to the virtual universe
    BranchGroup scene = createSceneGraph();
    u = new SimpleUniverse(c);

    // This will move the ViewPlatform back a bit so the
    // objects in the scene can be viewed.
    u.getViewingPlatform().setNominalViewingTransform();

    u.addBranchGraph(scene);
  }

  public void destroy() {
    u.cleanup();
  }

  public static void main(String argv[]) {

    BranchGroup group;

    new MainFrame(new ModelClipTest()500500);
  }
}

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