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the

.aur volumetric

format that V-Ray supports

.

Reload Cache – Reloads the cache file

.

Animation

Control – Controls how V-Ray

obtains the cache frame that has to be rendered at a given time. Note that the frame is not always an integer. In this case, interpolation is used to construct a temporary grid in RAM.

Manual – The default mode. The input sequence can be controlled

by Cache Start

 and Play Speed.
Frame

Index – An input frame number can be specified with

the Frame Index

 parameter below.

Loop – A specific piece of the sequence is looped.

The Cache Start

 parameter specifies where the looped sequence starts, Play Length

 specifies the length of the loop,

and Loop Overlap

 specifies the number of the end and start frames to overlap to ensure a smooth transition. The end transition frames are

taken after

 the end of the sequence specified by Play Length. For example if the loop starts at frame 35, has

a Play Length

 of 20

and Loop Overlap

 of 5, the transition frames will start at frame 55 and will end at frame 59. This means the sequence must be at least 59 frames long for the loop to work as intended.

Frame

Index – Used

in Frame Index

 mode, specifies the input frame number.

Loop

Overlap – Used

in Loop

 mode, specifies the number of the overlapped frames that ensure a smooth transition. It is recommended

that Loop

Overlap be longer than the average "lifetime" of the simulation elements. For example, if you simulate a waterfall, the "lifetime" is the time over which the water falls freely.

Cache

Start – An offset that specifies which cache file from the sequence

is placed on the timeline at the frame specified by

the Play Start

 parameter.

Play Start

 – A frame offset that specifies the timeline frame that the starting cache

is placed on.

Play Length

 – In Manual mode when this parameter is larger than 0, the sequence length is limited to its value.

In Loop

 mode this parameter specifies the loop length.

Play Speed

 – A multiplier for playback speed. A value of 1.0 means that the cache files correspond exactly to the frames on the timeline.

Frame Blending

 – Controls how to interpolate between cache files when needed, for example

when Play Speed

 is not 1.0 or the rendered frame is not exact.

Interpolation – Simple linear interpolation suitable for slow simulations.
Velocity

 – Velocity-based interpolation, which requires

a Velocity

 channel.

Load Nearest If

Missing – When enabled, if there is no cache file at the required frame, the nearest cache is found and loaded. This is useful when working with a simulation that ends with a sequence of static frames (for example, still liquid or freezing fire) because it removes the need to render multiple identical frames after the movement has stopped.

Flip Up

Axis – When enabled, flips the up axis of the grid. Can be used, for example, when using files imported from 3ds Max.

Mirror Z Axis – When enabled, the caches are mirrored along the Z axis.