The Extra Texture Render Element renders the entire scene with one texture mapped onto all objects in the scene. The texture applied to the scene can be a bitmap or a procedural texture such as Dirt or Curvature.

A common use for the ExtraTex is to use Dirt as the texture, which creates an ambient occlusion element for use in the composite. In this way, ambient occlusion can be controlled separately during the compositing process.

While you can obtain a result similar to the ExtraTex render element by applying the same texture to all objects in the scene and rendering as usual, such an approach requires additional time spent on reverting to actual materials, saving different versions of the scene, etc. The ExtraTex render element provides you with a quick and easy way to render the scene with a single texture without the extra work.

Extra Texture – Enables the Extra Texture.

– Assigns V-Ray texture. Mind that first you need to create the texture in the V-Ray Asset Editor to make it appear in the drop-down.

Affect Matte Objects – Sets whether to include matte objects when generating the render element. A matte object is an object that has been assigned a Wrapper Material with the Matte surface option enabled.