cgview.java

java 3d 4

/*
 *	@(#)cgview.java 1.15 02/10/21 13:42:58
 *
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 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
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import com.sun.j3d.utils.compression.* ;
import com.sun.j3d.utils.behaviors.vp.* ;
import com.sun.j3d.utils.applet.MainFrame ;
import com.sun.j3d.utils.universe.* ;
import javax.media.j3d.* ;
import javax.vecmath.* ;
import java.applet.Applet ;
import java.awt.BorderLayout ;
import java.awt.event.* ;
import java.io.* ;

public class cgview extends Applet {

    private SimpleUniverse u = null;

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

        // Create a Transformgroup to scale all objects so they
        // appear in the scene.
        TransformGroup objScale = new TransformGroup() ;
        Transform3D t3d = new Transform3D() ;
        t3d.setScale(0.7) ;
        objScale.setTransform(t3d) ;
        objRoot.addChild(objScale) ;

	// Create the transform group node and initialize it to the
	// identity.  Enable the TRANSFORM_WRITE capability so that
	// our behavior code can modify it at runtime.  Add it to the
	// root of the subgraph.
	TransformGroup objTrans = new TransformGroup() ;
	objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE) ;
	objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ) ;
	objScale.addChild(objTrans) ;

	// Add compressed geometry to the scene graph.
	CompressedGeometryHeader hdr = new CompressedGeometryHeader() ;
	cg.getCompressedGeometryHeader(hdr) ;

	// There isn't really enough information in the compressed geometry
	// header to unamiguously determine the proper rendering attributes.
	// The bufferDataPresent field specifies whether or not normals are
	// bundled with vertices, but the compressed buffer can still contain
	// normals that should be lit.  Assume that any surface geometry
	// should be lit and that lines and points should not unless the
	// header contains the NORMAL_IN_BUFFER bit.
	Material m = new Material() ;
	if ((hdr.bufferType == hdr.TRIANGLE_BUFFER) ||
	    ((hdr.bufferDataPresent & hdr.NORMAL_IN_BUFFER) == 1))
	    m.setLightingEnable(true) ;
	else
	    m.setLightingEnable(false) ;

	Appearance a = new Appearance() ;
	a.setMaterial(m) ;

	objTrans.addChild(new Shape3D(cg, a)) ;

	// Create mouse behavior scheduling bounds.
	BoundingSphere bounds =
	    new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0) ;

        // Set up the background
        Color3f bgColor = new Color3f(0.05f, 0.05f, 0.5f);
        Background bgNode = new Background(bgColor) ;
        bgNode.setApplicationBounds(bounds) ;
        objRoot.addChild(bgNode) ;

        // Set up the ambient light
        Color3f ambientColor = new Color3f(0.1f, 0.1f, 0.1f) ;
        AmbientLight ambientLightNode = new AmbientLight(ambientColor) ;
        ambientLightNode.setInfluencingBounds(bounds) ;
        objRoot.addChild(ambientLightNode) ;

        // Set up the directional lights
        Color3f light1Color = new Color3f(1.0f, 1.0f, 0.9f) ;
        Vector3f light1Direction  = new Vector3f(1.0f, 1.0f, 1.0f) ;
        Color3f light2Color = new Color3f(1.0f, 1.0f, 0.9f) ;
        Vector3f light2Direction  = new Vector3f(-1.0f, -1.0f, -0.9f) ;

        DirectionalLight light1
            = new DirectionalLight(light1Color, light1Direction) ;
        light1.setInfluencingBounds(bounds) ;
        objRoot.addChild(light1) ;

        DirectionalLight light2
            = new DirectionalLight(light2Color, light2Direction) ;
        light2.setInfluencingBounds(bounds) ;
        objRoot.addChild(light2) ;

	return objRoot ;
    }

    private void usage() {
	System.out.println("Usage: cgview <.cg file> <object index>")  ;
	System.exit(0)  ;
    }

    public cgview(String args[]) {
        if (args.length < 1)
	    usage() ;

	int index ;
	if (args.length < 2)
	    index = 0 ;
	else
	    index = Integer.parseInt(args[1]) ;

	String filename = args[0] ;
	if (filename == null)
	    usage() ;

	// Read the compressed geometry.
	CompressedGeometry cg = null ;
	try {
	    CompressedGeometryFile cgf ;
	    cgf = new CompressedGeometryFile(filename, false) ;

	    if (cgf.getObjectCount() == 0) {
		System.out.println("no objects were found in " + filename) ;
		System.exit(0) ;
	    }

	    cg = cgf.read(index) ;
	    cgf.close() ;

	} catch (IOException e) {
	    System.out.println(e) ;
	    System.exit(0) ;
	}

	setLayout(new BorderLayout()) ;
	Canvas3D c = new Canvas3D(SimpleUniverse.getPreferredConfiguration());
	add("Center", c) ;

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

	// add mouse behaviors to the ViewingPlatform
	ViewingPlatform viewingPlatform = u.getViewingPlatform();

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

	OrbitBehavior orbit = new OrbitBehavior(c, OrbitBehavior.REVERSE_ALL);
	BoundingSphere bounds = 
	  new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
	orbit.setSchedulingBounds(bounds);
	viewingPlatform.setViewPlatformBehavior(orbit);

	u.addBranchGraph(scene) ;
    }

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

    //
    // The following allows cgview to be run as an application
    // as well as an applet.
    //
    public static void main(String[] args) {
	new MainFrame(new cgview(args), 700, 700) ;
    }
}