Properties

Grids

OpenVDB can contain multiple grids which represent different «layers» of volume. The List Views shows all the grids in the OpenVDB-file along with its name and data type.

OpenVDB File

File Path

Volume sample file used by the volume data-block.

Sequence

Loads the OpenVDB-file as an animation loading separate files for individual frames.

Frames

Number of frames of the sequence to use.

Start

Global starting frame of the sequence, assuming the first frame has a 1 in the file name.

Offset

Offset the number of the frame to use in the animation.

Mode

Controls what happens when the volume sequence has reached the end frame.

Clip

Hides frames outside the specified frame range.

Extend

Repeats the start frame before, and the end frame after the frame range.

Repeat

Cycles the frames in the sequence; restarting at frame one.

Ping-Pong

Repeats the frames, reversing the playback direction on every other cycle.

Viewport Display

Wireframe

Method used to represent volumes in wireframe shading mode. For heavy volume data sets, it can be useful to set the object to always display as wireframe. This way the 3D Viewport remains responsive but the volume still appears in the final render.

None

The volume is not displayed in wireframe mode.

Bounds

Displays the volume as bounding box for the entire volume grid.

Boxes

Displays a bounding boxes for nodes in the volume tree.

Points

Displays points for nodes in the volume tree.

Detail

The amount of detail to display for Boxes or Points wireframe mode.

Course

Display one box or point for each intermediate tree node.

Fine

Display a box or point for each leaf node containing 8×8 voxels.

Density

Thickness of the volume in the 3D Viewport. The density of the volume in the render is adjusted via Volume Shading.

Render

Space

Specifies how volume density and step size are computed relative either to the object or world.

Object

Keeps volume Density and Detail the same regardless of object scale.

World

Specify Step Size and Density in world space.

Step Size Cycles Only

Distance between volume samples. Lower values render more detail at the cost of performance. If set to zero, the step size is automatically determined based on voxel size.

Clipping Cycles Only

Value under which voxels are considered empty space to optimize rendering.