Materials tab - PI-VR GmbH

» Modulesrendering tabRaytracing quality settings: Raytracingrequires a much higher photon count to receive artefact-free results, particularlywhen rendering scenes with animated objects, the result may flicker in regionswith a low photon count. This is why this mode should only be used for sceneswith static geometry and materials.Photon Tracing Notes and TipsPhoton Tracing has its main advantages in interior scenes. In exterior scenes most ofthe light illuminates the scene directly, the default full global illumination mode in VREDshows the best performance in this case.» Be aware that the number of photons emitted doesne’t resemble the number ofphotons actually stored. If a photon misses the scene it will not be stored. A photonbouncing several times in a scene might be stored more than once.To keepthe number of emitted photons as low as possible, place any light emitters in a waythat most photons will hit the scene.» When using Final Gathering scenes may suffer from light leaks if the photon radiusis set too large. Light leaks mainly result from bad geometry in architectural scene.an example would be an interior of a room illuminated through a window, thewalls being modelled as simple planes. Any geometry near the wall would get lightfrom outside the room since there is no actual thickness of the wall. The solutionwould be to actually model the outer walls as well. Reducing the lookup radiusmay also fix the problem but may require shooting more photons into the scene.» Final gathering may also show problems in scenes with very strong indirectionswhere the scene is primarly illmuniated by light resulting from reflections of a wall.in these situations disabling final gathering may give you a cleaner result.290