Autodesk 12812-051462-9011 User Guide 3 - Page 1473

Low The image buffer is not filtered but directly sampled instead. This option is fine for 8-bit images, AVI on page 7326 files, and so on. Medium Adjacent pixels are sampled and averaged. This produces a very significant improvement in cases where you're getting banding types of artifacts. It is slower than Low. High Adjacent pixels and the diagonal pixels are sampled, and each are given different weights. This is the slowest method and provides somewhat better quality than Medium. Use Light Smp Range Blurs the shadows cast in the volume based on the Sample Range value in the light's shadow parameters. Because increasing the Smp Range value blurs the shadow cast by the light, this makes shadows in the fog better match cast shadows, and helps prevent aliasing in the fog shadows. TIP With the Use Light Smp Range option, the higher the light's Smp Range value, the slower the rendering. However, with this option you can usually get good results with a lower Sample Volume % setting (such as 4), which reduces rendering time. Sample Volume % Controls the rate at which the volume is sampled. Ranges 1 through 10,000 (where 1 is the lowest quality and 10,000 is the highest quality). Auto Controls the Sample Volume % parameter automatically and disables the spinner (this is the default). The preset sampling rates are as follows: low=8; medium=25; high=50 Because the parameter ranges up to 100 there's still room to set it higher. Increasing the Sample Volume % parameter definitely slows things down, but in some cases you may want to increase it (for extremely high sample quality). 6728 | Chapter 21 Effects and Environments