Parallax Terrain Settings Parallax Quality Define the visual quality of the effect. Higher settings increase the amount of samples used to smooth the result. Parallax Refine Adds a refinement phase to improve the parallax effect. Enable/Disable this option to improve the visual quality or gain some performance. Parallax Distance Option to define the maximum rendering distance of the parallax effect. Parallax Height Use this value to adjust the maximum height of the parallax effect. Parallax AO Set the amount of extra ambient occlusion applied to the parallax surfaces.