1. Open the 4D Opacity Setting panel through Window > Panel menu.
  2. The channel selector is located on the top left corner of the panel.
    The Opacity curve graph is displayed in the center.
    The Mapping option allows to map the opacity vs the active channel intensity (default).
    The Mapping can be inverted using the Invert checkbox.
  3. As an alternative, the opacity can be mapped by the distance from the origin of one of the axes (X, Y or Z).
  4. Set the default Opacity curve according to the active rendering mode.
  5. Change the shape of the Opacity curve by acting on it. Left-click on the line to add a new point.
  6. Drag the points to change the shape of the curve. Move the curve to the left or the right to position it within the dynamic range.
  7. (Optional) Save the Opacity curve as a preset.

  8. The new preset will be shown in the pop-up menu in the Manage Opacity Curves section.