Quick JavaFX 18 test of adding multiple 3D SpotLight objects to the scene.

SpotLightTest.java

package edu.jhuapl.trinity.javafx;

import java.util.ArrayList;
import java.util.List;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Point3D;
import javafx.scene.Group;
import javafx.scene.PerspectiveCamera;
import javafx.scene.Scene;
import javafx.scene.SceneAntialiasing;
import javafx.scene.SpotLight;
import javafx.scene.SubScene;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.ScrollEvent;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.Box;
import javafx.scene.shape.CullFace;
import javafx.scene.shape.DrawMode;
import javafx.stage.Stage;
import org.fxyz3d.geometry.MathUtils;
import org.fxyz3d.utils.CameraTransformer;

public class SpotLightTest extends Application {
    protected Box box;
    PerspectiveCamera camera = new PerspectiveCamera(true);   
    public Group sceneRoot = new Group();
    public SubScene subScene;
    public CameraTransformer cameraTransform = new CameraTransformer();
    private double cameraDistance = -4000;
    private final double sceneWidth = 10000;
    private final double sceneHeight = 4000;

    private double mousePosX;
    private double mousePosY;
    private double mouseOldX;
    private double mouseOldY;
    private double mouseDeltaX;
    private double mouseDeltaY;
    
    @Override
    public void start(Stage primaryStage) throws Exception {

        subScene = new SubScene(sceneRoot, sceneWidth, sceneHeight, true, SceneAntialiasing.BALANCED);
        //Start Tracking mouse movements only when a button is pressed
        subScene.setOnMouseDragged((MouseEvent me) -> mouseDragCamera(me));
        subScene.setOnScroll((ScrollEvent event) -> {
            double modifier = 50.0;
            double modifierFactor = 0.1;

            if (event.isControlDown()) {
                modifier = 1;
            }
            if (event.isShiftDown()) {
                modifier = 100.0;
            }
            double z = camera.getTranslateZ();
            double newZ = z + event.getDeltaY() * modifierFactor * modifier;
            camera.setTranslateZ(newZ);
        });        
        StackPane stackPane = new StackPane(subScene);
        subScene.widthProperty().bind(stackPane.widthProperty());
        subScene.heightProperty().bind(stackPane.heightProperty());
        subScene.setFill(Color.LIGHTGREY);

        camera = new PerspectiveCamera(true);        
        //setup camera transform for rotational support
        cameraTransform.setTranslate(0, 0, 0);
        cameraTransform.getChildren().add(camera);
        camera.setNearClip(0.1);
        camera.setFarClip(100000.0);
        camera.setTranslateZ(cameraDistance);
        cameraTransform.ry.setAngle(-45.0);
        cameraTransform.rx.setAngle(-10.0);        
        subScene.setCamera(camera);

        //create multiple spot lights
        List<SpotLight> lights = new ArrayList<>();
        lights.add(new SpotLight(Color.WHITE));
        lights.add(new SpotLight(Color.GREEN));
        lights.add(new SpotLight(Color.RED));
        for(int i=0; i< lights.size(); i++) {
            SpotLight spotLight = lights.get(i);
            spotLight.setDirection(new Point3D(0, 1, 0));
            spotLight.setInnerAngle(120);
            spotLight.setOuterAngle(30);
            spotLight.setFalloff(-0.4);
            spotLight.setTranslateZ(2000 * i);
            spotLight.setTranslateY(-200);
        }
        
        box = new Box(sceneWidth, 50, sceneWidth);
        box.setDrawMode(DrawMode.FILL);
        box.setCullFace(CullFace.BACK);
        box.setMaterial(new PhongMaterial(Color.CYAN));

        sceneRoot.getChildren().addAll(cameraTransform, box);
        sceneRoot.getChildren().addAll(lights);

        BorderPane bpOilSpill = new BorderPane(subScene);
        stackPane.getChildren().clear();
        stackPane.getChildren().addAll(bpOilSpill);
        stackPane.setPadding(new Insets(10));
        stackPane.setBackground(new Background(new BackgroundFill(Color.rgb(255, 255, 255), CornerRadii.EMPTY, Insets.EMPTY)));
        Scene scene = new Scene(stackPane, 1000, 1000);
        scene.setOnMouseEntered(event -> subScene.requestFocus());
        
        primaryStage.setTitle("Multiple SpotLight Test");
        primaryStage.setScene(scene);
        primaryStage.show();
               
    }
    private void mouseDragCamera(MouseEvent me) {
        mouseOldX = mousePosX;
        mouseOldY = mousePosY;
        mousePosX = me.getSceneX();
        mousePosY = me.getSceneY();
        mouseDeltaX = (mousePosX - mouseOldX);
        mouseDeltaY = (mousePosY - mouseOldY);
        double modifier = 10.0;
        double modifierFactor = 0.1;

        if (me.isControlDown()) {
            modifier = 1;
        }
        if (me.isShiftDown()) {
            modifier = 50.0;
        }
        if (me.isPrimaryButtonDown()) {
            if(me.isAltDown()) { //roll
                cameraTransform.rz.setAngle(((cameraTransform.rz.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
            } else {
                cameraTransform.ry.setAngle(((cameraTransform.ry.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
                cameraTransform.rx.setAngle(
                        MathUtils.clamp(-60, 
                        (((cameraTransform.rx.getAngle() - mouseDeltaY * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180),
                        60)); // - 
            }
        } else if (me.isMiddleButtonDown() ) {
            cameraTransform.t.setX(cameraTransform.t.getX() + mouseDeltaX * modifierFactor * modifier * 0.3); // -
            cameraTransform.t.setY(cameraTransform.t.getY() + mouseDeltaY * modifierFactor * modifier * 0.3); // -
        }
    }    

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


}

oooo different colors could put spin and velocity effects on the 3D shapes. Oh this could be really cool.