One of the drawback for using Octane is that you can’t use multiple HDRs in one scene. The popular rendering engine has no method for using an HDR image for lighting and another for rendering. Octane 3 introduced a camera environment which can be used for this purpose. Why is this important? When you want to create a Sub Surface Scattering material, this can be a great facilitator.
Watch Rohan Dalvi walks though creating a Sub Surface Scattering Shader in Houdini With Octane. As a bonus, Rohan also shows how you can effectively use multiple HDR images in one scene for reflection and refraction.