How to Globally Override Scene Materials in V-Ray

1. Open the Render Setup Editor window.
2. Create a new Layer.
3. Create a new Collection.
4. Select the geometry with the material(s) you want to override and add them to the Collection list.
5. Right-click on the Collection and choose to Create Shader Override.
6. Connect a material to the Shader Override attribute.

To exclude objects from the material override, place them in a separate Collection in the same layer.

Given that you have already created render layers and scene objects are added to the layers, open the Channel Box and scroll down to the Render tab:

1. Select the render layer that you want to override.
2. Right-click and choose Overrides
3. Choose an existing scene material from the Assign Existing Material Override list, or select Create New Material Override to create a new material.

Note: The Legacy Render Layers provide no way to exclude objects from a material override. The override is placed on the entire layer.

For more details check How to Create a Global Override Material V-Ray for Maya documentation page.

1. Open the Render settings and enable the native Material Override option.
2. Select the desired material. All objects are rendered with the selected material applied.

For more details check Override Material V-Ray for Cinema 4D documentation page.

Material Override in Houdini

Using VRayRenderer ROP override:

1. On the VRayRenderer node (your render output node), go to the “Overrides” tab.
2. Here you can set Material override. This allows you to specify a global override material for everything.

For more details check Material Overrides V-Ray for Houdini documentation page.

Material Override in 3ds Max

1. Open Render Setup and go to V-Ray Tab.
2. In Global swithes enable Mtl override settings.
3. You can add material to be used as override as well as Include or Exlude specific materials from being overriden.

For more details check Global Switches V-Ray for 3ds Max documentation page.