6 modules - PI-VR GmbH

6.4 Renderingand materials.• Use Final Gather For Glossy Reflections: If activated, glossy reflections arenot evaluated by path tracing but use the final gather map instead. Thisreduces the rendertime but results in less accurate reflections.» Lightsource Sampling Quality Settings:• Interactive: Sets the interactive lightsource sampling quality.• Still Frame: Sets the still frame lightsource sampling quality.» Reflection/Refraction Sampling Quality Settings:• Interactive: Sets the interactive sampling quality of reflections and refractions.• Still Frame: Sets the still frame sampling quality of reflections and refractions.» Trace Depth Settings:• Max Trace Depth: Sets the maximum amount of reflection and refractioneach ray may encounter.• Max Shadow Depth: Sets the maximum amount of shadow samples.» Photon Tracing Notes and Tips Photon Tracing has its main advantages ininterior scenes. In exterior scenes most of the light illuminates the scene directly,the default full global illumination mode in VRED shows the best performance inthis case.Be aware that the number of photons emitted doesn’t resemble the numberofphotons actually stored. If a photon misses the scene it will not be stored. Aphoton bouncing several times in a scene might be stored more than once.Tokeep the number of emitted photons as low as possible, place any light emittersin a way that 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 architecturalscene. An example would be an interior of a room illuminated through a window,187