Environment Map

Powerful rendering technique that simulates the reflections and lighting of a 3D scene by wrapping it with a panoramic image. Essentially, it's a texture that represents the surroundings of the virtual environment, often derived from a high-dynamic-range image (HDRI). This map captures the intricate interplay of light and reflections, providing a realistic and immersive visual experience in computer graphics. The environment map in Three.js contributes to the creation of lifelike and dynamic scenes by enhancing the appearance of materials and surfaces through accurate reflections and lighting effects.

Easy 3D Model Viewer suppors .exr enviroment maps used as background and/or just to light the model, in this example it is used as a background.