Cylindrical projections wrap Texture maps on a surface with a cylindrical shape. Cylindrical projections provide a quick way to map a Texture on cylindrical-shaped surfaces without too much distortion. However, the seams of the texture may be visible in the render, depending on the surface's shape.
Figure 1: Cylindrical projections
Figure 2 shows the Cylindrical projection applied to an OctaneRender® Checks texture node.
Figure 2: The Cylindrical Projection type