* Catmull-Rom spline interpolation for smooth continuous curves. * Unlike per-segment easing, this creates fluid motion without pauses at waypoints.

* Get keyframe by index with wrapping for seamless looping

* Show a temporary notification message.

* Main update method - called each frame.

* Update uniform values from config object. * Called when UI controls change.

* Create the black hole visualization mesh. * Uses a large inverted sphere as the render surface with a custom TSL shader.

* Convert a color value to hex string. * Handles Tweakpane's color object format {r, g, b} or hex strings.

* Calculate the total duration of all keyframes

* Clear configuration from localStorage.

* Main shader creation method. * Builds the complete raymarching shader using Three.js TSL.

* Get the current keyframe index and local time within that keyframe

* Initialize all shader uniforms with default values. * These can be updated in real-time via the UI.

* Interpolate using Catmull-Rom spline for smooth continuous motion

* Load configuration from localStorage, merging with defaults.

* Handle window resize.

* Regenerate the black hole mesh (e.g., after config changes).

* Save current configuration to localStorage. * Normalizes color values to hex strings before saving.

* Start the camera animation

* Stop the camera animation and restore controls

* Toggle animation on/off

* Update camera position uniform from Three.js camera.

* Get current animation progress (0-1)

* Check if animation is currently playing

* Update the animation (call every frame) * @param {number} deltaTime - Time since last frame in seconds