Autodesk 12812-051462-9011 User Guide 3 - Page 2841

record the position of various parts of the talent's body while performing motions. Posture When you work with a biped on page 4147, the posture refers to the position of selected biped parts, as opposed to the overall pose on page 8095. You can copy and paste postures. See Copy/Paste Rollout on page 4389. Precedence You control an IK solution on page 8009 by setting joint precedence to determine which joints contribute the most to the IK solution and which joints contribute the least. Joints with high precedence values are calculated first, and, therefore, contribute more motion to the IK solution. Joints with low precedence values are calculated last, and, therefore, contribute the least motion to the IK solution. Joints with equal precedence values are calculated by their order in the hierarchy. Joints deeper in the hierarchy (closer to the end effector) are calculated first and joints closer to the root are calculated last. Premultiplied Alpha There are two methods of storing alpha in a bitmap: premultiplied and nonpremultiplied. To composite an image that is in nonpremultiplied format, the alpha must be multiplied by each of the R, G, and B channels before adding it to the color of the background image. This provides the correct transparency effect, but it must be done each time you composite. With premultiplied alpha, you store the R, G, and B components with the alpha already multiplied in, so compositing is more efficient. This is not the only reason that 3ds Max stores images in the premultiplied format. When you render an image, you typically want the edges of the objects to be antialiased. This effect is achieved by determining the fractional coverage of pixels on the edge of the object, and then adjusting the alpha of the pixel 8096 | Glossary