I"ve done that, here is the code.
Mainly i create a bufferedimage that i fill with a gradient, and then assign this
image to a Background
node.
Nevertheless, i've submitted a weird thing to Kelvin, and i'm still waiting for his
response.
Sometimes, the background is white, and mapping does not appear, and if i add a mapped
object
in the scenegraph, the different textureunit stages i use make the background change
colors ...
Quite weird. I hope to get an answer for that.
// creating a background texture for the tiles frame.
BufferedImage background = new BufferedImage( w, h, BufferedImage.TYPE_INT_RGB );
Graphics2D g = background.createGraphics();
GradientPaint gp = new GradientPaint( 0,0, new Color( 0.0f, 0.8f, 0.6f ), w-1, h-1,
new Color( 0.9f, 0.2f, 0.2f ) );
g.setRenderingHint( RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE
);
g.setRenderingHint( RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR );
g.setRenderingHint( RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY
);
g.setPaint( gp );
g.fillRect( 0,0, w-1, h-1 );
// preparing and adding background
Background bg = new Background( new ImageComponent2D( ImageComponent2D.FORMAT_RGB,
background ) );
bg.setApplicationBounds( bound );
bg.setImageScaleMode( bg.SCALE_FIT_ALL );
then, add the background node to your scenegraph.. tadaaaaa
Tell me if you also have the bugs...
At 12/02/2003 16:49:00, you wrote:
>Hi All,
>I am trying to create a background with a color gradient.
>I am working with HelloUniverse example for this.
>I am trying to use Background geometry.
>The problem is that when I give the branchgroup , to which the geometry is added as
>an argument to setGeometry method of Background class ,I cannot see the effect.
>The code is :
>import java.applet.Applet;
>import java.awt.BorderLayout;
>import java.awt.event.*;
>import java.awt.Color;
>import java.awt.GraphicsConfiguration;
>import com.sun.j3d.utils.applet.MainFrame;
>import com.sun.j3d.utils.geometry.ColorCube;
>import com.sun.j3d.utils.universe.*;
>import javax.media.j3d.*;
>import javax.vecmath.*;
>import com.sun.j3d.utils.geometry.Sphere;
>
>public class HelloUniverse extends Applet {
>
> private SimpleUniverse u = null;
> Color3f white = new Color3f(1.0f,1.0f,1.0f);
> Color3f blue = new Color3f(0.0f,0.0f,1.0f);
>
> private final float[] vertices =
> { 1.0f,-1.0f,1.0f,
> 1.0f, 1.0f,1.0f,
> -1.0f, 1.0f,1.0f,
> -1.0f,-1.0f,1.0f};
>
>
> public BranchGroup createSceneGraph() {
>
> BranchGroup objRoot = new BranchGroup();
>
> TransformGroup objTrans = new TransformGroup();
> objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> objRoot.addChild(objTrans);
>
> // Create a simple Shape3D node; add it to the scene graph.
> objTrans.addChild(new ColorCube(0.4));
>
> Transform3D yAxis = new Transform3D();
> Alpha rotationAlpha = new Alpha(-1, 4000);
>
> RotationInterpolator rotator =
> new RotationInterpolator(rotationAlpha, objTrans, yAxis,
> 0.0f, (float) Math.PI*2.0f);
> BoundingSphere bounds =
> new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
> rotator.setSchedulingBounds(bounds);
> objRoot.addChild(rotator);
>
>
> BranchGroup branch = new BranchGroup();
> branch.setCapability(BranchGroup.ALLOW_CHILDREN_EXTEND);
> branch.setCapability(BranchGroup.ALLOW_CHILDREN_READ);
> branch.setCapability(BranchGroup.ALLOW_CHILDREN_WRITE);
>
>
> Shape3D rectangle = new Shape3D();
> rectangle.setCapability(Shape3D.ALLOW_GEOMETRY_READ);
> rectangle.setCapability(Shape3D.ALLOW_GEOMETRY_WRITE);
> rectangle.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
> rectangle.setCapability(Shape3D.ALLOW_APPEARANCE_READ);
> rectangle.setCapability(Shape3D.ALLOW_APPEARANCE_OVERRIDE_WRITE);
> rectangle.setCapability(Shape3D.ALLOW_APPEARANCE_OVERRIDE_READ);
> rectangle.setCapability(Shape3D.ALLOW_LOCAL_TO_VWORLD_READ);
>
> QuadArray aQuadArray = new
>QuadArray(4,QuadArray.COORDINATES|QuadArray.NORMALS|QuadArray.COLOR_3);
> aQuadArray.setCapability(QuadArray.ALLOW_COLOR_READ);
> aQuadArray.setCapability(QuadArray.ALLOW_COLOR_WRITE);
> aQuadArray.setCapability(QuadArray.ALLOW_COORDINATE_WRITE);
> aQuadArray.setCapability(QuadArray.ALLOW_COORDINATE_READ);
>
>
> aQuadArray.setCoordinates(0,vertices);
>
>
> Vector3f vector=new Vector3f( 0.0f,0.7f,0.7f);
> for( int i = 0; i < 4; i++ )
> {aQuadArray.setNormal( i,vector);}
>
>
> aQuadArray.setColor(0,white);
> aQuadArray.setColor(1,white);
> aQuadArray.setColor(2,blue);
> aQuadArray.setColor(3,blue);
>
>
> rectangle.addGeometry(aQuadArray);
> branch.addChild(rectangle);
> Background background = new Background();
> background.setApplicationBounds(bounds);
> background.setCapability(Background.ALLOW_GEOMETRY_READ);
> background.setCapability(Background.ALLOW_GEOMETRY_WRITE);
> background.setGeometry(branch);
>
> objRoot.addChild(background);
>
> objRoot.compile();
> return objRoot;
>
> }
>
> public HelloUniverse() {
>
> }
>
> 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);
>
> u.getViewingPlatform().setNominalViewingTransform();
>
> u.addBranchGraph(scene);
> }
>
> public void destroy() {
>
> u.removeAllLocales();
>
> }
>
> public static void main(String[] args) {
> new MainFrame(new HelloUniverse(), 256, 256);
> }
>
>
>}
>
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