Function render_scene_output_with_progress 

pub fn render_scene_output_with_progress(
    constructor: impl SceneConstructor,
    name: String,
    scene_config: &SceneConfig,
    output: &Output,
    buffer_count: usize,
    on_progress: Option<Box<dyn Fn(u64, u64) + Send>>,
)

Available on crate feature render and non-target_family=wasm only.

Render one output with optional progress callback.

The callback receives (current_frame, total_frames) each frame.