This is place where the mesh's viewport representation is controlled.
Visible
Toggle the mesh's visibility.
Particle channel
Here you can visualize the active → particle channels as a gradient map. To see the channel please enable the “Smooth Shaded” mode with the 0 key.
Transparency
Mesh visibility can range from opaque (0.0) to completely transparent (1.0). This feature does not work when a “Particle channel” or “Render as points” is active.
Back face culling
When enabled RealFlow does not draw hidden mesh polygons.
Render as points
With this mode, only the mesh's vertices will be displayed. Their size can be controlled with the associated “@ Points size” parameter.
@ Points size
When “Render as points” is active only the mesh's vertices will be displayed and here you can control their size.