![[Global switches rollout]](vray_for_3ds_max_manual/global_switches/options.png)
Geometry
section
Displacement - enables (default) or
disables V-Ray's own displacement mapping. Note that this has no effect on
standard Max displacement mapping, which can be controlled via the
corresponding parameter in the Render Scene dialog.
Force back face culling - enables or
disables (default) back face culling for camera and shadow rays. When this
option is on, the surfaces of objects which are
turned away from the camera (or the light source, when tracing shadows) will
appear fully transparent. This allows to look inside closed objects when the
camera is outside.
Lighting section
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
off, 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.
Materials section
Reflection/refraction - enables or
disables the calculation of reflections and refractions in V-Ray maps and
materials.
Max depth - enables the user to limit
globally the reflection/refraction depth. When this is unchecked, the depth
is controlled locally by the materials/maps. When this option is checked,
all materials and maps use the 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.
Filter maps for GI - enable or disable
texture filtering during GI calculations and glossy reflections/refractions.
When off (the default), texture maps are not
filtered for GI and glossy reflections/refractions in order to speed up the
calculations. If this option is on, textures will
be filtered in these cases.
Max. transp levels - this controls to what
depth transparent objects will be traced.
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.
Override mtl - this option allows the user
to override the scene materials when rendering. All objects will be rendered
with the chosen material, if one is selected, or with their default
wireframe materials if no material is specified.
Override exclude - clicking this button
brings up the 3ds Max Include/Exclude dialog which allows you to select
exactly for which objects the material is overridden.
Glossy effects - this option allows the
user to replace all glossy reflections in the scene with non-glossy ones;
useful for test renderings.
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.
Raytracing section
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.
This parameter is also useful when using the 3ds Max
Render-to-texture feature.
Compatibility section
Legacy sun/sky/camera models - previous
versions of V-Ray used slightly different calculation models for the
VRaySun,
VRaySky and
VRayPhysicalCamera which were not entirely physically accurate. When
this option is off (the default), V-Ray uses
improved and more accurate models. When this is on,
V-Ray will switch to the old models for compatibility with old scenes. When
an old scene is opened, V-Ray will automatically display a dialog asking if
you want to change this setting.
Use 3ds Max photometric scale - when
on (the default), this option aligns the
VRayLight,
VRaySun,
VRaySky and
VRayPhysicalCamera to the photometric units used by 3ds Max and its
photometric lights. When this is off, these
plugins operate in the internal V-Ray photometric space, like in older
versions of V-Ray. Keeping this option on ensures that a VRayLight with a
given power will match a 3ds Max photometric light with the same power.
