Bipul Mohanto

Bipul Mohanto

Doctoral Researcher@ Foveated Rendering | 3D Graphics Rendering| Global Illumination | Multi-View Rendering | Applied Human Perception | Color Science | Computer Vision

Popular Global Illumination Offline and Real-Time Engines

less than 1 minute read

Published:

Real-Time Path Tracing Engines and Frameworks

  1. The G3D Innovation Engine, OptiX backend with path tracer. However, to the best of my knowledge (2026), the project is not regularly maintained
    • lighthouse2 (no updated for long): path tracing included

Production Renderer (Offline)

  1. Pixar RenderMan
  2. V-Ray
  3. Cycles-Blender, with Blender, use OptiX backend
  4. Autodesk Arnold, OptiX in backend
  5. NVidia IRay, OptiX backend
  6. Cinema 4D
  7. DreamWorks’ open-source project openmoonray, Intel Embree
  8. Houdini, OptiX backend

Other than the commercial rendering engines, there are also some small scale rendering projects, like

  1. Luxrender, OptiX back end

For Research

  1. Mitsuba 3 Physically Based Renderer
  2. Both the pbrt-v3 and pbrt-v4 excellent offline global illumination renderer, frequently being used for proof of concept

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tauray

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At the time of writing this (October, 2025), there are limited publicly available rendering engine that works for real-time stereo path tracing. The slow convergence with pixel dense display in VR is limiting real-time stereo path tracer. However, with the RT-core and GPU architecture improvements, I am noticing the recent trend of physically accurate light simulation in real-time rendering, e.g., games. Therefore, definitely with time, the real-time stereo path-tracing (and with other advanced global illumination algorithms) would be a real thing once we will overcome frame-rate constraint. Physically-accurate light simulation will minimized the difference between real and virtual world and extend the path of true immersion. Currently, 90 fps has become a golden standard for VR. However, the higher is the better for immersion.

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Tamashii is an excellent scientific rendering framework under development by the Department of Computer Graphics, TU Wien. Its main goal is to simplify the creation of research applications in the field of computer graphics by providing a fundamental structure in the form of libraries implementing resource loading, input handling, user interface creation, a complete rendering framework, and graphics API abstraction. The backend graphics API is Vulkan. However, Tamashii only supports single display systems, and \textbf{has not been modified for VR.}