Overlaping Shapes - Incorrect Form Matching

Question

Overlaping Shapes - Incorrect Form Matching

In short - I have two rotating rectangles. When rotating (along the Y axis) they must intersect one above the other - the unsatisfactory one of the ractangles is “always ahead”, despite the rotation by 180 degrees. How to fix this behavior? This seems to be important for the order in whitch rectangles added to the group. The one that was added as the last is always ahead.

scene:

    package drawing.scene;

import javafx.application.Application;
import javafx.geometry.Point3D;
import javafx.scene.Camera;
import javafx.scene.Group;
import javafx.scene.PerspectiveCamera;
import javafx.scene.Scene;
import javafx.scene.transform.Rotate;
import javafx.stage.Stage;
import drawing.objects.Clock;
import drawing.objects.Cube;

public class MyScene extends Application {

    private int sceneEdgeSize = 800;
    private int clolcSize = 400;

    @Override
    public void start(Stage primaryStage) throws Exception {
        Group g = new Group();
        g.setTranslateX((sceneEdgeSize - clolcSize) / 2f);
        g.setTranslateY((sceneEdgeSize - clolcSize) / 2f);

        final Cube c = new Cube(clolcSize);
        g.getChildren().add(c);
        Thread t = new Thread(new Runnable() {

            @Override
            public void run() {
                Rotate r = rotate(0, Rotate.Y_AXIS);
                c.getTransforms().add(r);
                double angle = 0.0;
                while (true) {

                    r.setAngle(angle += 2);
                    try {
                        Thread.sleep(25);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
        });
        t.setDaemon(true);
        primaryStage.setScene(new Scene(g, sceneEdgeSize, sceneEdgeSize));
        PerspectiveCamera camera = new PerspectiveCamera();
        primaryStage.getScene().setCamera(camera);
        primaryStage.show();
        t.start();

    }

    public static void main(String[] args) {
        launch(args);
    }

    public Rotate rotate(double angle, Point3D axis) {
        return new Rotate(angle, clolcSize / 2f, clolcSize / 2f, 0, axis);
    }

}

cube class:

package drawing.objects;

import javafx.collections.ObservableList;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.RectangleBuilder;
import javafx.scene.transform.Rotate;

public class Cube extends Group {

    private double edgeLength = 0;

    public Cube(double edgeLength) {
        super();
        this.edgeLength = edgeLength;
        create();
    }

    private void create() {
        final Rotate rx = new Rotate(0, Rotate.X_AXIS);
        final Rotate ry = new Rotate(0, Rotate.Y_AXIS);
        final Rotate rz = new Rotate(0, Rotate.Z_AXIS);

        this.getTransforms().addAll(rx, ry, rz);

        ObservableList<Node> children = this.getChildren();
        //@formatter:off

        Rectangle rect;

        rect = RectangleBuilder // face
                .create()
                .width(edgeLength-20)
                .height(edgeLength-20)
                .translateZ(edgeLength * 0.5)
//                  .translateY(edgeLength * 0.5)
                //  .translateX(-edgeLength * 0.5)
                .fill(Color.LIGHTGREEN)
                .build()
                ;
        children.add(rect);
        rect = RectangleBuilder // face
                .create()
                .width(edgeLength-20)
                .height(edgeLength-20)
                .translateZ(-edgeLength * 0.5)
//              .translateY(-edgeLength * 0.5)
            //  .translateX(-edgeLength * 0.5)
                .fill(Color.DARKGREEN)
                .build()
                ;
        children.add(rect);


        //@formatter:on
    }
}

+3

java javafx

Antoniossss Oct 25 '13 at 11:57

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1 answer

jewelsea · Accepted Answer · 2013-10-25T19:44:12+0000

You must enable the depth of buffering in your scene .

The code in this question is pretty much outdated and also incorrect in parts:

JavaFX 3D, Java 8.
Box .
Sphere, Cylinder MeshView.
Point Ambient , .
3D-, .
.
.
, JavaFX.
RotateTransition.
. (, node) ( Platform.runLater).
, true. JavaFX, .

, JavaFX 3D:

System.out.println(
  "3D supported? " + 
  Platform.isSupported(ConditionalFeature.SCENE3D)
);

Java 8 3D

, Java 8.

import javafx.animation.*;
import javafx.application.Application;
import javafx.scene.*;
import javafx.scene.paint.*;
import javafx.scene.shape.Box;
import javafx.scene.transform.Rotate;
import javafx.stage.Stage;
import javafx.util.Duration;

public class RotatingCube extends Application {

    private static final double SCENE_SIZE = 300;
    private static final double BOX_EDGE_LENGTH = SCENE_SIZE / 2d;

    private static final Color BOX_COLOR     = Color.DARKGREEN;
    private static final Color AMBIENT_COLOR = Color.rgb(30, 30, 30);
    private static final Color LIGHT_COLOR   = Color.WHITE;

    private static final Duration ROTATION_DURATION = Duration.seconds(4.5);

    @Override
    public void start(Stage stage) throws Exception {
        Scene scene = new Scene(
                new Group(
                        new AmbientLight(AMBIENT_COLOR),
                        createPointLight(),
                        createRotatingBox()
                ),
                SCENE_SIZE, SCENE_SIZE,
                true,
                SceneAntialiasing.BALANCED
        );
        scene.setFill(Color.MIDNIGHTBLUE.darker().darker().darker());
        scene.setCamera(new PerspectiveCamera());

        stage.setScene(scene);
        stage.show();
    }

    private PointLight createPointLight() {
        PointLight light = new PointLight(LIGHT_COLOR);
        light.setTranslateX( SCENE_SIZE / 2d);
        light.setTranslateY( SCENE_SIZE / 2d);
        light.setTranslateZ(-SCENE_SIZE);

        return light;
    }

    private Box createRotatingBox() {
        final Box box = new Box(BOX_EDGE_LENGTH, BOX_EDGE_LENGTH, BOX_EDGE_LENGTH);
        box.setTranslateX(SCENE_SIZE / 2d);
        box.setTranslateY(SCENE_SIZE / 2d);
        box.setTranslateZ(BOX_EDGE_LENGTH / 2d);
        box.setMaterial(new PhongMaterial(BOX_COLOR));

        rotateAroundYAxis(box);

        return box;
    }

    private void rotateAroundYAxis(Box box) {
        RotateTransition rotate = new RotateTransition(ROTATION_DURATION, box);
        rotate.setFromAngle(0);
        rotate.setToAngle(360);
        rotate.setAxis(Rotate.Y_AXIS);
        rotate.setCycleCount(RotateTransition.INDEFINITE);
        rotate.setInterpolator(Interpolator.LINEAR);
        rotate.play();
    }

    public static void main(String[] args) {
        launch(args);
    }

}

Java 8 3D

import javafx.animation.*;
import javafx.application.*;
import javafx.scene.*;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.transform.Rotate;
import javafx.stage.Stage;
import javafx.util.Duration;

public class RotatingRectangles extends Application {

    private static final double SCENE_SIZE = 300;
    private static final double EDGE_LENGTH = SCENE_SIZE / 2d;

    private static final Duration ROTATION_DURATION = Duration.seconds(4.5);

    @Override
    public void start(Stage stage) throws Exception {
        System.out.println(
            "3D supported? " +
            Platform.isSupported(ConditionalFeature.SCENE3D)
        );

        Scene scene = new Scene(
                createRotatingShapes(),
                SCENE_SIZE, SCENE_SIZE,
                true,
                SceneAntialiasing.BALANCED
        );
        scene.setFill(Color.MIDNIGHTBLUE.darker().darker().darker());
        scene.setCamera(new PerspectiveCamera());

        stage.setScene(scene);
        stage.show();
    }

    private Group createRotatingShapes() {
        final Rectangle rect1 = new Rectangle(
            EDGE_LENGTH, EDGE_LENGTH,
            Color.LIGHTGREEN
        );
        rect1.setTranslateX(-EDGE_LENGTH / 2d);
        rect1.setTranslateY(-EDGE_LENGTH / 2d);
        rect1.setTranslateZ( EDGE_LENGTH / 2d);

        final Rectangle rect2 = new Rectangle(
            EDGE_LENGTH, EDGE_LENGTH,
            Color.DARKGREEN
        );
        rect2.setTranslateX(-EDGE_LENGTH / 2d);
        rect2.setTranslateY(-EDGE_LENGTH / 2d);
        rect2.setTranslateZ(-EDGE_LENGTH / 2d);

        final Group shapes = new Group(
            rect1, rect2
        );

        shapes.setTranslateX(SCENE_SIZE / 2d);
        shapes.setTranslateY(SCENE_SIZE / 2d);
        shapes.setTranslateZ(EDGE_LENGTH / 2d);

        rotateAroundYAxis(shapes);

        return shapes;
    }

    private void rotateAroundYAxis(Node node) {
        RotateTransition rotate = new RotateTransition(ROTATION_DURATION, node);
        rotate.setFromAngle(0);
        rotate.setToAngle(360);
        rotate.setAxis(Rotate.Y_AXIS);
        rotate.setCycleCount(RotateTransition.INDEFINITE);
        rotate.setInterpolator(Interpolator.LINEAR);
        rotate.play();
    }

    public static void main(String[] args) {
        launch(args);
    }

}

.

, , JavaFX .

Overlaping Shapes - Incorrect Form Matching

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