A Mesh Emitter is a Polygon object that emits light into a scene (figure 1). This is possible by applying a DiffuseAmount of diffusion, or the reflection of light photons at different angles from an uneven or granular surface. Used for dull, non-reflecting materials or mesh emitters. material to the Mesh object, and then connecting a Black BodyAn opaque object that emits thermal radiation. In Octane, this is used to designate illumination properties for mesh emitters. or Texture emission node to the Diffuse materialUsed for dull, non-reflecting materials or mesh emitters.'s Emission channel.
Figure 1: A sphere objects used as a mesh emitter