Reviewer Guide

What changed in Version 3

The Infinity Engine keeps one double-double reference orbit on the CPU while Metal uses quad-single expansion arithmetic to evaluate and recover per-pixel perturbations in parallel. This replaces the earlier progressive CPU-tile description for ultra-deep Mandelbrot scenes.

Suggested review path

Start with Mandelbrot and Julia at a shallow view, then apply a high-iteration bookmark and wait for the entire target frame. Move beyond 10¹⁶×, confirm the HUD identifies the Infinity path, and test deep pan, pinch, and double-tap behavior.

• Compare Exact LUT and Smooth color sampling
• Try multiple built-in palettes
• Verify the Free five-bookmark boundary
• Test custom palettes, 3D Look, and high-resolution export with Pro

Claims to use carefully

Mandelbrot Metal uses adaptive finite precision through a validated 1×10²⁵ ceiling. Performance varies by scene, scale, iterations, SSAA, drawable size, hardware, and thermal state.