[FIXED] Cube doesn't disappear after being beyond the FarClip distance

Issue

My problem is that after moving my camera away from the cube(-z direction), with setFarClip(-1000), to the position -1010 it won't disappear.

Here is the code:

@Override
public void start(Stage stage) throws IOException {

    Box box = new Box(100,100,100);
    Camera cam = new PerspectiveCamera(true);
    Group group = new Group();
    group.getChildren().add(box);

    Scene scene = new Scene(group,1920,1080);
    scene.setCamera(cam);

    cam.translateXProperty().set(0);
    cam.translateYProperty().set(0);
    cam.translateZProperty().set(-100);
    cam.setNearClip(1);
    cam.setFarClip(-1000);
    scene.setFill(Color.SILVER);


    System.out.println("CamX: "+scene.getCamera().getTranslateX()
            +", CamY: "+scene.getCamera().getTranslateY()+", CamZ: "+scene.getCamera().getTranslateZ());
    stage.addEventHandler(KeyEvent.KEY_PRESSED, event ->{

        switch(event.getCode())
        {
            case W :
                cam.translateZProperty().set(cam.getTranslateZ()+10);
                System.out.println("CamX: "+scene.getCamera().getTranslateX()
                        +", CamY: "+scene.getCamera().getTranslateY()+", CamZ: "+scene.getCamera().getTranslateZ());
            break;


            case A:
                cam.translateXProperty().set(cam.getTranslateX()-10);
                System.out.println("CamX: "+scene.getCamera().getTranslateX()
                        +", CamY: "+scene.getCamera().getTranslateY()+", CamZ: "+scene.getCamera().getTranslateZ());
                break;

            case D:
                cam.translateXProperty().set(cam.getTranslateX()+10);
                System.out.println("CamX: "+scene.getCamera().getTranslateX()
                        +", CamY: "+scene.getCamera().getTranslateY()+", CamZ: "+scene.getCamera().getTranslateZ());
                break;


            case S:
                cam.translateZProperty().set(cam.getTranslateZ()-10);
                System.out.println("CamX: "+scene.getCamera().getTranslateX()
                        +", CamY: "+scene.getCamera().getTranslateY()+", CamZ: "+scene.getCamera().getTranslateZ());
            break;
        }


    });

    stage.setTitle("Test");
    stage.setScene(scene);
    stage.show();

}

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

Instead of printing scence.getCamera().getTranslateX() out, I tried cam.getTranslateX(), which would always give 0.0. So either way it always registers the position as 0.0 and will never be beyond the farclip plane or something entirely else which I didn't grasp or consider. Thank you for every tip.

Solution

You have the sign wrong, instead of:

cam.setFarClip(-1000);

write:

cam.setFarClip(1000);

A negative value for farClip would mean to clip behind the camera, which makes no sense.

You may want to review the coordinate directions for axes:

In the JavaFX scene coordinate space, the default camera's projection plane is at Z=0 and camera coordinate system is as follows:

• X-axis points to the right

• Y-axis points down

• Z-axis points away from the viewer or into the screen.

So a positive Z (which is the measurement for farClip in default camera orientation), is a location into the screen, and a negative Z would be a location behind the screen.

Answered By - jewelsea
Answer Checked By - David Marino (JavaFixing Volunteer)