Hello App

ke.App owns the window, render loop, camera, scene facade, and renderer. A Python application subclasses it and implements lifecycle callbacks.

import kangengine as ke


class HelloApp(ke.App):
    def setup(self):
        self.set_camera_view([3.0, -4.0, 2.0], [0.0, 0.0, 0.5])

    def pre_render(self):
        pass

    def render(self):
        pass


app = HelloApp()
app.initialize(1280, 720, False, ke.UpAxis.Y)
app.start()

Save this as hello_app.py and run:

python hello_app.py

Lifecycle callback names retain their C++ virtual spelling, while normal Python methods use snake_case.

• setup(): create resources and scene objects once.

• pre_update(): process input and other once-per-rendered-frame state.

• fixed_update(fixed_dt): run zero or more fixed control/physics updates.

• pre_render(): synchronize the latest state and prepare visuals.

• render(): build ImGui panels or other per-frame UI.

• post_render(): perform work after drawing.

• cleanup(): release explicitly owned simulation resources.

See Fixed Timestep and Rendering before adding physics to an application.

The complete scene example used by the next page is python/examples/render_prim_scene.py.

Next: First Scene.