Mari 4.5v2 docs:

Shading Functions

A list of functions for adding, editing, removing, and toggling shaders, as well as how to change the lighting, can be found in the table below.

Function	How to access it	What it does	Opens this dialog box	Notes
Add new shader	• Menubar \| Shading > Add New Shader • Right-click \| in Shaders Palette > Add New Shader • Button \| Shaders Palette >	Adds a new shader from the choices: • Principled BRDF, • Unreal, • VRayMtl, • Layered, and • Choose Diffuse and Specular.	Create Shader Dialog when selecting Choose Diffuse and Specular. Masks Formats Dialog when selecting Layered.	The Choose Diffuse and Specular option allows you to create a custom shader. Refer to the Create Shader Dialog for more information.
Add new shader layer	• Button \| Shaders Palette > Shader Layers tab >	Adds a new shader to the layer stack for the selected layered shader: • Unreal, • Principled BRDF, • VRayMtl, and • Choose Diffuse and Specular.	Create Shader Dialog when selecting Choose Diffuse and Specular.	The Choose Diffuse and Specular option allows you to create a custom shader. Refer to the Create Shader Dialog for more information.
Duplicate shader	• Menubar \| Shading > Duplicate Shader • Right-click \| in Shaders Palette > Duplicate Shader • Button \| Shaders Palette >	Makes a copy of the selected shader.
Delete shader	• Menubar \| Shading > Remove Shader • Right-click \| in Shaders Palette> Remove Shader • Button \| Shaders Palette >	Deletes the selected shader from the project.
Cut shader	• Right-click \| on shader in Shaders Palette > Cut • Ctrl/Cmd+X	Cuts the shader from the Shaders palette list and places it in the clipboard.		Default shaders cannot be cut or pasted.
Copy shader	• Right-click \| on shader in Shaders Palette > Copy • Ctrl/Cmd+C	Copies the shader from the Shaders palette list and places it in the clipboard.		Default shaders cannot be copied or pasted.
Paste shader	• Right-click \| on shader in Shaders Palette > Paste • Ctrl/Cmd+V	Pastes the cut or copied shader from the clipboard into the Shaders palette list.
Add shader mask	• Button \| Shaders Palette > Shader Layers tab >	Adds a mask to the selected shader layer in the Shader Layers tab.
Add shader mask stack	• Button \| Shaders Palette > Shader Layers tab >	Adds a mask stack to the selected shader layer in the Shader Layers tab.
Remove shader layer	• Button \| Shaders Palette > Shader Layers tab >	Removes the shader layer from the layer stack in the Shader Layers tab.
Assign a color tag	• Button \| Shaders Palette > Shader Layers tab >	Assigns the selected shader a color tag that can be searched for with the color tag filter.
Set lighting on main mesh to flat	• Menubar \| Shading > Flat • Toolbar \|	Shades all pixels with the same value.
Set lighting on main mesh to basic	• Menubar \| Shading > Basic • Toolbar \|	Applies a basic lighting model.
Set lighting on main mesh to full	• Menubar \| Shading > Full • Toolbar \|	Applies a full, configurable lighting model.		From within the Lighting palette, you can also adjust the four basic lights or the environment light. Mari saves these lighting values with the project.
Toggle shadows in the display	• Menubar \| Shading > Shadows • Toolbar \|	Toggles whether to show the shadows in the display.		This does not enable or disable shadow processing. To enable shadow processing, in the Mari Preferences Dialog, in the GPU tab, enable the Shadow Maps > Allowed checkbox. By default this preference is disabled.
Toggle wireframe view	• Menubar \| Shading > Toggle Wireframe • Keyboard \| Shift+W • Toolbar \|	Toggles whether to show the wireframes on the model.
Toggle UV image rendering	• Menubar \| Shading > Toggle UvImage • Toolbar \|	Shows the patches in the UV view as they appear after export, including the overspill areas.
Toggle whole patch project	• Menubar \| Shading > Toggle Whole Patch Project • Toolbar \|	Enables painting outside geometry shell boundaries in UV patches.		This is only available in UV views.