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The Coordinates and Noise rollouts are standard 3ds Max texture rollouts.

Shader file – Specifies the .osl or .oso file which contains the shader (object) code. This button control also supports a context menu with the following options:

Clear – Unloads the current shader and restores the plug-in as if no shaders have been loaded.
Reset

 – Reloads the shader and resets its parameters to the default values.
Reload

 – Reloads the shader but keeps the current parameter values.
Open Containing Folder

 – Reveals the shader location in Explorer.
Open in External Editor

 – Opens the shader in an appropriate text editor.
Open in Quick Shader – Opens the loaded file's code in the text editor of the Quick Shader.

Copy File Path – Puts the full path of the currently loaded file in the clipboard.
Copy Folder Path – Copies the parent directory of the currently loaded file into the clipboard.
Recent Files – Holds a list of the recently loaded shaders and an option to clear the list.

If you edit your OSL shader, the new version would be loaded only after a Clear, Reset, or a 

Reload option has been selected.

Closure output – Specifies the closure color source for the materials's output. The built-in output closure color parameter Ci is selected by default.

Max ray depth – Specifies the maximum reflection/refraction depth for the shader.

Show preview – Determines whether to render a shader preview in the 3ds Max Material Editor.

Clamp shader result – Determines whether to force the result into the [0, clamping limit] range.

Clamping limit – Specifies the upper clamp limit

if clamp shader result

 is enabled.

Viewport color – Specifies the diffuse component of the material used in viewport shading.

Wrap texture coordinates – Automatically wraps the texture coordinates for the OSL shader, passing only values in the [0.0, 1.0] range.

Flip textures – Flips all attached textures vertically for compatibility with 3ds Max OSL Map.

Use uvgen – Uses the information from the UV Generator of the VRayOSLMtl. When disabled, uses information from the UV Generator of textures used or the OSL node.

Export shader name to OSO – Saves the shader as *.oso file.

Image Added – Help button which opens a URL provided by the shader.

Specific parameters (if any) are listed in this rollout.

Enable – Makes the Quick Shader's text area active. 

Once enabled, place the original code inside the text area. Alternatively, start writing in the blank area your own code. 

If you have already loaded a shader in the material parameters, right-click on it and

select Open in Quick Shader

 option.

Another way to do this is to activate the text area and drag and drop the .osl

 file in there. It will load the code instantly.

Right-clicking on the Quick Shader panel opens a context menu. You

can Compile

 the code after doing changes

or Compile and Reset Parameters, which affects the values of the parameters in the shader as well.

Once ready with editing, press the Compile button to refresh the UI. Modifications are updated in the UI and renderer after the successful code compilation. You can monitor the messages in

the Compiler

diagnostics rollout during compilation. 

is used when an osl module is not found in the

available system paths. You

can Add

 or Remove

 additional paths directly from the UI by pressing the corresponding button.