The Glowing Circle texture node generates a greyscale glowing circle-like pattern (figure 1).
Figure 1: The Glowing Circle texture applied to a Diffuse materialUsed for dull, non-reflecting materials or mesh emitters. on the Octane logo
Radius - Determines the radius of the circle.
Line Width - Determines the thickness of the line that produces the circle.
UVW Transform - Positions, scales, and rotates the surface texture.
Projection - Sets how the texture projects onto the surface.