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three.kt (Work in progress)

License: MIT contributions welcome

CI Gitter

Kotlin/JVM port of the popular three.js 3D library (r106).

Be warned, while the basics works, such as:

  • Primitives, Points and TubeGeometry
  • All materials and lights
  • OrbitControls
  • 2D textures
  • Raycasting against Mesh
  • OBJ, MTL and STL loaders
  • Other stuff like mirror, sky and water shaders

a lot of features are still missing and the API can change rapidly.

Right now, this is mostly interesting for developers that want to contribute.

API (subject to changes)

Kotlin
Window(antialias = 4).use { window ->

    val scene = Scene().apply {
        setBackground(Color.aliceblue)
    }

    val camera = PerspectiveCamera(75, window.aspect, 0.1, 1000).apply {
        position.z = 5f
    }

    val renderer = GLRenderer(window.size)

    val box = Mesh(BoxGeometry(1f), MeshBasicMaterial().apply {
        color.set(0x00ff00)
    })
    scene.add(box)
    
    val clock = Clock()
    val controls = OrbitControls(camera, window)
    window.animate {
     
        val dt = clock.getDelta()
        box.rotation.x += 1f * dt
        box.rotation.y += 1f * dt

        renderer.render(scene, camera)

    }

}
Java
public class JavaExample {

    public static void main(String[] args) {

        try (Window window = new Window()) {

            Scene scene = new Scene();
            PerspectiveCamera camera = new PerspectiveCamera();
            camera.getPosition().z = 5;
            GLRenderer renderer = new GLRenderer(window.getSize());

            BoxBufferGeometry boxBufferGeometry = new BoxBufferGeometry();
            MeshPhongMaterial boxMaterial = new MeshPhongMaterial();
            boxMaterial.getColor().set(Color.getRoyalblue());

            Mesh box = new Mesh(boxBufferGeometry, boxMaterial);
            scene.add(box);

            MeshBasicMaterial wireframeMaterial = new MeshBasicMaterial();
            wireframeMaterial.getColor().set(0x000000);
            wireframeMaterial.setWireframe(true);
            Mesh wireframe = new Mesh(box.getGeometry().clone(), wireframeMaterial);
            scene.add(wireframe);

            AmbientLight light = new AmbientLight();
            scene.add(light);

            OrbitControls orbitControls = new OrbitControls(camera, window);

            window.animate(() -> {
                renderer.render(scene, camera);
            });

        }

    }

}

Artifacts are available through Maven central:

repositories {
    mavenCentral()
}

dependencies {
    def version = "..."
    implementation "info.laht.threekt:core:$version"
}

Screenshots

seascape points ocean pointlights

Looking for the Kotlin/JS wrapper project?

It has been renamed and moved to here.

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Three.js port for the JVM (desktop)

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