Autodesk 12812-051462-9011 User Guide 3 - Page 2889

TCB (Tension, Continuity, Bias) The TCB Position controller provides Tension, Continuity, and Bias controls of the splines of a function curve. TCB Controllers on page 3258 also produce curve-based animation much like the Bezier controllers on page 3138. However, TCB controllers do not use tangent types or adjustable tangent handles. They use numeric values to adjust the Tension, Continuity, and Bias of the animation. Bias Controls where the animation curve occurs with respect to the key. High Bias pushes the curve beyond the key. This produces a linear curve coming into the key and an exaggerated curve leaving the key. Low Bias pulls the curve before the key. This produces an exaggerated curve coming into the key and a linear curve leaving the key. The default value of 25 distributes the curve evenly to both sides of the key. Continuity Controls the tangential property of the curve at the key. The default setting is the only value that produces a smooth animation curve through the key. All other values produce a discontinuity in the animation curve causing an abrupt change in the animation. High Continuity values create curved overshoot on both sides of the key. Low Continuity values create a linear animation curve. Low continuity creates a linear curve similar to high tension except without the Ease To and Ease From side effect. The default value of 25 creates a smooth continuous curve at the key. Tension Controls the amount of curvature in the animation curve. High Tension produces a linear curve. It also has a slight Ease To and Ease From effect. Low Tension produces a very wide, rounded curve. It also has a slight negative Ease To and Ease From effect. The default value of 25 produces an even amount of curvature through the key. Tendons When you use Physique on page 4603, after you adjust envelope parameters for good mesh deformation, you can use tendons on page 4747 to control the amount of skin stretching across multiple links. While envelopes provide 8144 | Glossary