Displayer surfaces can be made transparent. This is useful when surface definition is desirable but you wish to see what's beyond the surface.
To make displayer surfaces transparent expand the Scenes node, any scene node and the Displayers node. Select and expand any displayer which displays surfaces (geometry or scalar displayers).
Expand the Expert category in the Properties window and click the right half of the Opacity property.
Use the slider or the text box to set a value between 0 and 1.0, where 0 means the parts are fully transparent and 1.0 means the parts are fully opaque.
In the example below two geometry displayers are used to display different parts with different degrees of transparency.
