This example visualizes a 3D Sierpinski triangle as a pyramid built from smaller tetrahedra that align with the faces of the outer shape. Animated via a recursive generation process, the scene renders with Three.js using WebGL and canvas, while OrbitControls enable interactive rotation. The code constructs pyramid geometries and materials with directional and point lights, casts shadows onto a ground plane, and applies ambient lighting. A green background and double-sided white materials highlight the fractal’s structure as the camera orbits freely.