6 modules - PI-VR GmbH

8.1 Truelight Materials» Subsurface Scattering Translucency and subsurface scattering are two completelydifferent methods of calculating light passing through the back of an objectinto the observer’s ’eye’. While translucency requires far less calculation power,subsurface scattering does offer more possibilities and greater flexibility.» Translucency: The translucency algorithm allows to collect light from the avertedside of an object. It then calculates the distance between the entrance and exit ofthe ray path and determines the intensity of the translucency. These effects can becontrolled. There are two modes when operating with translucency, dependingon what objects to project:• Thin Walled Translucency: This mode is suitable for one-sided objects. Itrequires more calculation time than the solid translucency mode, but whenin doubt, use this mode.• Solid Translucency: The solid translucency is used for solid objects. Pleasenote that unpredictable problems can occur when using this mode on onesidedobjects.• Color: Determines the color of the scattering/translucent light.• Roughness: Defines the amount of diffusion that is applied to translucentlight.• Use Texture: Loads an image texture for the diffuse color channel. Uses theimage as pattern on the surfaces.· Repeat Mode UV: Sets the repeat mode of the texture. There are fourmodes, which can be set:· Repeat: Repeats the texture in all directions. Repeat· Mirrored Repeat: Repeats and mirrors the texture on the x- and y-axis with every repetition.· Decal: The texture will not be repeated.· Clamp: Repeats only the last pixel of the texture will be repeated.· Link repeat modes: Uses the same repeat mode for v-coordinates as forthe u-coordinates.171