Indirect illumination section
Search Keywords: switches, global switches
The global switches allow you to control various aspects of the renderer globally.
Displacement - enables (default) or disables V-Ray displacement mapping.
Indirect illumination section
Don't render final image - when this option is on, V-Ray will only calculate the relevant global illumination maps (photon maps, light maps, irradiance maps). This is a useful option if you are calculating maps for a fly-through animation.
Allow negative color used in texture for displacement - when enabled V-Ray will recognize negative colors in textures that are used for displacement and displace the geometry in the opposite direction.
Output alpha channel to separate file - when enabled a separate output image file will be generated for the alpha render element during the final rendering
Secondary rays bias - a small positive offset that will be applied to all secondary rays; this can be used if you have overlapping faces in the scene to avoid the black splotches that may appear. See the Examples section for a demonstration of the effect of this parameter.
Lights - enables or disables lights globally. Note that if you uncheck this, V-Ray will use the default lights. If you do not want any direct lighting in your scene, you must uncheck both this and the Default lights parameters.
Default lights - enables or disables the usage of the default lights when there are no light objects in the scene or when you have disabled lighting globally (see the Lights parameter).
Hidden lights - enables or disables the usage of hidden lights. When this is checked, lights are rendered regardless of whether they are hidden or not. When this option is disabled, any lights that are hidden for any reason (either explicitly or by type) will not be included in the rendering.
Shadows - enables or disables shadows globally.
Show GI only - when this option is on, direct lighting will not be included in the final rendering. Note that lights will still be considered for GI calculations, however in the end only the indirect lighting will be shown.
Multiplier - this is a multiplier for the blur filter applied to all textures which are either loaded from the hard drive (hard based) or loaded from the memory (when Softimage ClipFX is involved)
Reflection/refraction - enables or disables the calculation of reflections and refractions in V-Ray maps and materials.
Max depth - enables the user to globally limit the reflection/refraction depth. When this is unchecked, the depth is controlled locally by the materials. When this option is checked, all materials use the Max depth specified here.
Maps - enables or disables texture maps.
Filter maps - enables or disables texture map filtering. When enabled, the depth is controlled locally by the settings of the texture maps. When disabled, no filtering is performed.
Max. transp. levels - this controls to what depth transparent objects will be traced. Reducing the depth will cause faster rendering but may produce artifacts.
Transp. cutoff - this controls when tracing of transparent objects will be stopped. If the accumulated transparency of a ray is below this threshold, no further tracing will be performed.
Glossy effects - enables and disables the rendering of glossy effects
Override mtl - turning this option on will override all scene materials with a single diffuse material when rendering. This feature can be useful during the lighting placement phase of the pipeline.