JavaFX 3D PerspectiveCamera坐标转换及轨道导航实现问题

问题修复方案 #

1. 坐标转换逻辑修正 #

你原有moveLocal*方法的坐标转换逻辑颠倒，沿相机本地轴向移动的正确逻辑是：获取本地轴向的单位向量，转换为父坐标系下的方向，再叠加到当前父坐标位移上。替换原移动相关方法：

private void moveLocalX(double amount) {
    Point3D direction = localToParent(Point3D.X_AXIS.multiply(amount)).subtract(localToParent(Point3D.ZERO));
    setTranslateX(getTranslateX() + direction.getX());
    setTranslateY(getTranslateY() + direction.getY());
    setTranslateZ(getTranslateZ() + direction.getZ());
}

private void moveLocalY(double amount) {
    Point3D direction = localToParent(Point3D.Y_AXIS.multiply(amount)).subtract(localToParent(Point3D.ZERO));
    setTranslateX(getTranslateX() + direction.getX());
    setTranslateY(getTranslateY() + direction.getY());
    setTranslateZ(getTranslateZ() + direction.getZ());
}

private void moveLocalZ(double amount) {
    Point3D direction = localToParent(Point3D.Z_AXIS.multiply(amount)).subtract(localToParent(Point3D.ZERO));
    setTranslateX(getTranslateX() + direction.getX());
    setTranslateY(getTranslateY() + direction.getY());
    setTranslateZ(getTranslateZ() + direction.getZ());
}

2. 俯视原点配置不生效修复 #

问题出在额外添加的旋转变换和原有旋转变换冲突，且初始位移/角度配置不对。不需要新增pointDown变换，直接修改构造方法初始配置即可实现俯视效果：

public NavigableCamera(Scene scene)  {
    camera = new PerspectiveCamera(true);
    camera.setFarClip(6000);
    camera.setNearClip(0.01);
    getChildren().add(camera);

    // 俯视原点配置
    setTranslateY(-500);
    xRotate.setAngle(-90);

    getTransforms().addAll(xRotate, yRotate, zRotate);

    initKeyboardControl(scene);
    initMouseControl(scene);
    initTouchControls(scene);

    scene.setCamera(camera);
}

3. 触摸缩放逻辑修复 #

你原有修改scaleZ的逻辑完全错误，缩放不会改变相机位置，直接调用修正后的moveLocalZ方法即可实现沿视角前后移动：

private void initTouchControls(Scene scene) {
    scene.setOnZoomStarted(event -> {
        z = getTranslateZ();
    });

    scene.setOnZoom(event -> {
        double delta = (event.getZoomFactor() - 1) * 100;
        moveLocalZ(delta);
    });
}

其他已知问题修复 #

你原有键盘事件处理代码存在语法错误，删掉多余的无效行即可：

private void initKeyboardControl(Scene scene) {
    scene.setOnKeyPressed(event -> {
        KeyCode code = event.getCode();
        switch (code) {
            case SPACE:
                moveLocalZ(+10);
                break;
            case BACK_SPACE:
                moveLocalZ(-10);
                break;
            case RIGHT:
                moveLocalX(+10);
                break;
            case LEFT:
                moveLocalX(-10);
                break;
            case UP:
                moveLocalY(-10);
                break;
            case DOWN:
                moveLocalY(+10);
                break;
        }
    });
}

内容的提问来源于stack exchange，提问作者Joshua Chambers