6 modules - PI-VR GmbH

6.4 Rendering» Raytracing Quality» Illumination Mode: VRED has various illumination modes for rendering in raytracing.You may choose different illumination modes for interactive renderingand still frame rendering. This allows to work in a precomputed mode for fastinteraction with the scene and automatically switching to full global illuminationfor still frame rendering. Four modes are available:• Precomputed Illumination: The precomputed illumination mode is comparableto VRED OpenGL rendering mode. It uses precomputed ambient occlusionand indirect illumination for rendering and calculates specular reflectionsand refractions and correct shadows from lightsources.• Precomputed + Shadows: The Precomputed + Shadows Mode uses precomputedimage based lighting and indirect illumination but doesn’t use precomputedAmbient Occlusion values. Instead it calculates shadows based on theactive environment.• Precomputed + IBL: The new Precomputed + IBL Mode uses precomputedindirect illumination and samples the environment. It replaces the old FastGlobal Illumination mode.• Full Global Illumination: The Full Global Illumination Mode doesn’t use anyprecomputed values but accurately samples everything in a physically basedapproach. Note that other features like Photon Mapping require the rendermodeto be set to Full Global Illumination.» Photon Tracing: Photon Tracing provides an approach to calculate the globalillumination in a scene. The default full global illumination mode in VRED provideshigh quality results but may require longer calculation times. Photon Tracing canreduce the time required to render a clean image by a larger margin, especiallyin indoor scenarios like car interieurs or architectural indoor scenes.• Mode: VRED provides different Photon mapping modes.· Off: Disables Photon Tracing and uses the default full global illuminationalgorithm in VRED.147