6 modules - PI-VR GmbH

4.14 Render Settings» Mode:• Off: Disables Photon Tracing and uses the default full global illuminationalgorithm in VRED.• Indirect Only: Uses photon tracing to calculate the indirect illumination in ascene. This is the most common mode.• Caustics + Indirect: Uses Photon Tracing to calculate indirect illuminationand caustics due to specular materials in a scene.» Interactive/Still Frame count: The two photon count values specify the numberof photons being sent into the scene for each image sample. Specifying a photoncount of 100000 photons while having set the image samples set to 256 will resultin 25.600.000 photons send into the scene for a frame. More photons result insmoother results.» Lookup Radius: The lookup radius specifies the radius around a scenes’s hitpointused by the raytracer to find photons around the hitpoint. A larger radius allowsthe raytracer to find more photons but may result in slower lookup times.» Final Gather Quality: There are two ways to use the photon map. The firstapproach is always used for caustic photons. It gathers photons around a hitpointto calculate the incoming illumination. This approach gives very fast interactiveperformance and is capable to calculate all light pathes in a scene, but it mayrequire a very high photon count to get a clean image. The other approachis to use final gathering. In final gathering a one bounce indirect illumination isperformed before evaluating the Photon Maps. This is the default Photon Tracingapproach in VRED since it generates high quality images in a very short time.Setting the final gather quality to 0 enables the first approach while setting it toany other value uses the second approach.» Final Gather Radius: Sets the lookup radius used to find the nearest final gatherpoint during raytracing. Using a smaller radius will increase performance but itrequires more photons to avoid dark regions.» Final Gather Refresh: Setting the Final Gather Quality to 1 or higher, the updatefrequency of the Photon Map may be set. By default the Photon Maps are updated61