How does subsurface scattering work in materials like skin or wax in 3D rendering?

Subsurface scattering in 3D rendering simulates how light penetrates, scatters internally, and exits translucent materials like skin or wax, creating natural softness and a lifelike glow. Light photons enter the material and scatter off internal particles—such as collagen in skin or wax molecules—bouncing multiple times before re-emerging at varying points, unlike opaque surfaces that reflect light sharply. Adjusting parameters like scattering depth (how far light travels) and color absorption (e.g., red wavelengths for skin) enhances realism, ensuring the material looks authentic without complex setups. This process mimics real-world light behavior, resulting in the diffused, glowing appearance characteristic of skin, wax, and other translucent materials in 3D renders.