For luxury items, the accurate depiction of precious stones is not just a feature; it's a requirement. Static images and traditional real-time engines often fail to capture the unique optical properties that make gemstones captivating. This is why we developed the Gemplus™ shader, a core component of the Vanilla platform.
Gemplus™ is not a simple material. It's a custom-written GLSL "super-shader" engineered from the ground up to simulate the complex journey of light through a faceted stone. It combines multiple advanced techniques to deliver unparalleled realism, directly in your browser.
Core Features of the Gemplus™ Shader
1. Index of Refraction (IOR)
Every gemstone bends light differently. Gemplus™ uses a physically-accurate Index of Refraction to control how much light passing through the stone is bent. This is crucial for achieving the characteristic look of different gems, from the hard brilliance of a diamond to the softer glow of an emerald.
2. Chromatic Dispersion ("Fire")
When white light enters a gemstone, it splits into a rainbow of colors. This effect, known as dispersion or "fire", is what gives diamonds their famous sparkle. Our shader simulates this by splitting light into its component colors and refracting each one at a slightly different angle, creating vibrant flashes of color that change as you move the stone.
3. Environment-Based Lighting
A gemstone's beauty is deeply connected to its surroundings. Gemplus™ uses a separate, specialized environment map just for refraction. This allows for rich, detailed, and realistic light interactions inside the stone, creating a depth and complexity that is impossible with standard lighting models. The refracted environment is visible through the stone, grounding it in its virtual space.
4. Automatic Performance Optimization
Scenes with hundreds or thousands of tiny pavé stones would bring most real-time engines to a crawl. The Vanilla platform intelligently detects when multiple identical Gemplus™ materials and geometries are used, and automatically converts them into hyper-performant `InstancedMesh` objects. This means you can create dazzling, complex pavé designs that remain perfectly smooth and interactive in the final viewer.
The Gemplus™ shader is more than just a rendering technique; it's a testament to our philosophy of honoring the craft. It's one of the core technologies that allows Vanilla to produce experiences, not just images.