The Sample Position node takes the sample position and converts it into an RGB color with R and G in the range -1 to +1. Sample position textures are typically used to store position values for objects such as particles and points. Figure 1 illustrates what a sample position texture typically looks like when connected to the 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. input on an Octane material.
Figure 1: Connecting the Sample Position texture to the Diffuse input on an Octane material