The render options dialog lets you customize key aspects in the rendering process. Pressing the Render Parameters button in the Maxwell Ribbon panel will bring up the render parameters customization interface set on the "General" tab.

From here you can tell the plugin to:

Save the output files.
Set the global scene scales.
Set the maximum render time and number of cores used to render.
Enable multilight to be able to edit light intensities during the render.
Enable multilight readback so the changes you make to lights during the render can be saved in your revit document.
Turn light instancing on or off to control if multiple lights of the same type are controlled separately or all at once during a render with multilight enabled.

NOTE: Because light intensity is controlled by the family type in Revit, if light instancing is turned off, only the edits made to the last instance of said type can be saved with Multilight readback.

Tonemapping tab

The tone mapping tab lets you choose the color space to be used for the exported image as well as gamma correction, sharpness adjust and burn. For details on what these settings to, please see the regular Maxwell documentation about tonemapping found here.

Environment tab

The environment tab lets you control the sky used in the render. For details on these settings please see the Maxwell documentation about environment lighting found here.

Camera tab

The camera tab provides a way to let you customize the physical parameters of the camera as well as:

Change the view used for rendering
Pick the target for the camera focus

For details on the Maxwell camera settings please see the regular Maxwell documentation about cameras, found here.

Simulens tab

This tab allows you to control the Simulens settings of the render.

Render Layers tab

The render layers tab lets you choose which "type" of calculated GI lighting is included in the render.

Render channels tab

The render channels tab lets you choose additional channels to be saved with the render. For more info, see Channels

Image Based Environment tab

The image based environment tab lets you choose HDR images to be used as for lighting your scene. For more info, please see Environment Lighting

Search Paths tab

The search paths tab lets you choose a set of paths to look in for assets if they aren't found when the rendering starts. Assets can be textures used in a material, HDR images used for Environment Lighting, IES files attached to emitters, .IOR files used in a material.

Pressing the add path button brings up a modal dialog that lets you choose a path from your disk.
Pressing the edit path button lets you edit a path you selected. If no path is selected, then this button does nothing.
Pressing the remove path button will remove a path from the list. If there is no path selected, then this button does nothing.

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