...
The determination of whether to export as transparent is made based both on the SketchUp material's Opacity value and on its color; in cases where it seems appropriate, the plugin will generate what is known in Maxwell as an AGS material -- this is a glass-like material which works with non-volumetric meshes and also renders faster than a real dielectric glass material, due to its lack of refraction.
...
Click the Maxwell Fire button in the plugin toolbar:
The Maxwell Fire window will be shown:
Next, click the window's Fire button to plugin will export the SketchUp model to Maxwell Fire, and start it rendering will begin:
RS
Click Render in the plugin's toolbar:
...