Viewport Preview

The viewport preview shows a fluid channel using one of the shaders or a generic color scale for a more analytic result.

Show Bounding Boxes

Check to display the bounding boxes. The clipping box is displayed in white, the simulated region-of-interest is diplayed in green.

Show Grid

Check in order to display the container's grid in the viewport. This allows you to visualize the resolution of the fluid container.


Select the fluid channel that you want displayed in the viewport.


Select the shader you want applied to the viewport preview. If this selection is None, the generic color scale and range fitting is used to shade the values.

Note that for performance reasons some of the shading features are not applied to the viewport preview.

The preview is not applying
  • Smoothing

  • Separate Opacity

  • Sub-Grid Detail

  • Illumination

  • Motion Blur

  • Distance/Opacity Mapping

Use Shader Color

If checked, the shader's color settings are used for the preview. Else, only it's mapping is used along with the generic color scale.

Preview Mode

Full Slicing mode renders the whole 3D volume semi-transparent with opacity and color depending on the channel values.

Single Slice mode renders a 2D slice of the volume and allows for close inspection of the values.

Interpolate Voxels

Uncheck this if you want to see the separate voxels more clearly.

Slice Orientation

Available in Single Slice Mode.

Specifies the orientation of the slice for perspective viewports. Orthogonal viewports will always display the slice oriented such that it is visible and ignore this parameter.

Slice Position

Available in Single Slice Mode.

Use this slider to move the slice along it's normal direction.

Slices per Voxel

Available in Full Slicing Mode.

The higher this value is, the smoother the preview will look. Values above 2 may not improve the result significantly because of the limited color resolution of the OpenGL framebuffer.


Available in Full Slicing Mode.

Set the overall opacity of the preview to high values in order to amplify the faint parts of the fluid. Bring it down to smaller values in order to see the inner core of the fluid cloud.

Fit Range

Find the minimum and maximum value in the current grid and set the display range accordingly.

While the Density and Fuel channels only have values from 0 to 1, the other channels have larger value ranges. For these channels this function can be used to fit the displayed range to the values that are actually present in the current frame. This is also a quick way to check how strong velocities or how high temperatures are.


If checked, the range will be fit to the current frame automatically.

Range Start

The start value for the displayed range. All values in the channel that are below or equal to the Range Start will be displayed with the color at the low end of the gradient.

Range End

The end value for the displayed range. All values in the channel that are above or equal to the Range End will be displayed with the color at the high end of the gradient.