Autodesk 12812-051462-9011 User Guide 3 - Page 1163

Filtering Options group Crop Alpha Removes antialiasing from the alpha channel. Global Supersampler When the default scanline renderer is active, the text field shows the type of global supersampling that is currently in use. When the mental ray renderer is active, it shows the number of samples per pixel. Default=None. ■ Setup Click to set up global sampling. When the default scanline renderer is active, clicking Setup displays the Render dialog's Default Scanline Renderer rollout on page 6141, whose Global Supersampling group lets you globally enable supersampling, and choose the supersampling method. When the mental ray renderer is active, clicking Setup displays the Render dialog's Sampling Quality rollout on page 6272, which lets you adjust the level of sampling. Method group These controls let you choose how to use normals from the source object. ■ Raytrace (The default.) When chosen, normals are ray-traced between the source and target objects. The objects need to be perfectly aligned in world space on page 8175. When you view both high-res and low-res objects in viewports, they must line up with each other exactly. There are no special requirements for the mapping coordinates of the high-res objects. ■ UV Match When chosen, normals are obtained by matching the target object's local UV coordinates to those of the source. The objects' UV coordinates on page 8161 need to be perfectly aligned. If you look at the objects using the Unwrap UVW modifier's Edit UVWs dialog on page 1859, the low-res and high-res objects must be lined up with each other exactly. The high-res object needs to have mapping coordinates on the same map channel you are using for the low-res object. Typically, the high-res object will have an Unwrap UVW modifier assigned to it, but this is not required. With this option, the high-res object does not need to be in the same physical location as the low-res object. TIP You can reset the cage (on the Cage rollout on page 1635), because UV Match does not use it. Use Cage When on, bases projection on the Projection modifier's cage sub-object. When off, uses an offset instead. Default=on. 6418 | Chapter 20 Rendering