Autodesk 12812-051462-9011 User Guide 3 - Page 263

over brass (a value of static friction that might run from 0.05 to 0.2), the sliding friction drops to a significantly lower value, on the order of .01 to 0.1. For some materials, such as specific friction materials like brake linings, sliding friction is just as high as static friction because it is used in conjunction with a nearly frictionless material such as hardened polished steel. Raytracing Acceleration Parameters Dialog Rendering menu > Raytracer Settings > Render Setup dialog > Raytracer panel > Raytracer Global Parameters rollout > Global Raytrace Engine Options group > Acceleration Controls button The controls in this dialog let you override the default acceleration values and specify your own requirements. Typically you don't need to use them, but if you are familiar with the requirements of your scene, they can help you optimize raytrace rendering for your specific needs and time constraints. Raytracing subdivides the scene, organizing it into a tree for raytrace purposes. A node in this tree is known as a "voxel." Voxel trees are dynamic, and you can't explicitly specify the structure of the tree. (If you set Max. Divisions to 2, the tree is an octree, which is possibly a more familiar data structure.) TIP If your scene is particularly unbalanced (for example, it has a giant planet object and a cluster of small spacecraft objects) keep the Balance setting low. Interface Face Limit Sets the maximum number of faces allowed in a lattice voxel before it is subdivided. Default=10. Balance Determines the sensitivity of the subdivision algorithm. Increasing this value uses more memory but can increase performance. Default=4.0. 5518 | Chapter 19 Material Editor, Materials, and Maps