Radiosity is a global illumination algorithm used in 3D computer graphics rendering. Unlike direct illumination algorithms (such as Ray tracing), which tend to simulate light reflecting only once off each surface, global illumination algorithms such as Radiosity simulate the many reflections of light around a scene, generally resulting in softer, more natural shadows and reflections. Notable commercial Radiosity engines have been Lightscape (now incorporated into the Autodesk 3D Studio Max internal render engine), and more recently Maxwell~Renderer by Next Limit.