Render engine

A render engine is software that converts a 3D scene into a 2D image or animation by computing how light interacts with materials and cameras. Different engines use different algorithms—rasterization for real-time performance or ray/path tracing for physically accurate lighting—so they trade off speed against realism. A render engine relies on shaders, material models, sampling strategies and may run on CPU or GPU; settings like sample count, bounce depth and denoising affect final quality and render time. Render engines commonly output render passes/AOVs and integrate closely with 3D modeling and compositing workflows.

Imagine creating a product visualization: you model the object, set up UVs and textures, then pick a render engine. For fast lookdev and iteration you might use a rasterization-based engine (e.g. Eevee or a real-time game engine) to get second-scale previews; for the final photoreal image you switch to a path tracer (e.g. Cycles, Arnold), increase samples and bounce settings, or farm out frames to a render farm to reduce wall-clock time. Throughout, you tune material shaders, enable AOVs for reflections/roughness, and apply denoising and exposure adjustments in compositing.