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| reference materialTCB Spline Controls | |||||
| What
is a TCB Spline? A spline is a the curvature of the path formed by keyframes and controlled by elements called Tension, Continuity and Bias. Spline controls do not affect the time it takes an item to reach a particular frame, only the path it takes. Valid values range from -1.0 to 1.0 for each setting. Fractional values are acceptable. For each example included here, the spline setting was set for the second keyframe. Linear settings only affect the path between the previous and current keyframe. |
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Tension controls the speed at which an item approaches and moves through a keyframe. Positive values slow an item through a keyframe ("ease-in") while negative values speed it up ("ease-out"). A value of 0 causes an item to move at a constant speed through a keyframe. A high tension value (1.0) is often used at the end of a flying move in order for the item to come to a gradual stop. A high tension setting at the beginning of a move would result in the logo slowly starting out, while a negative value would have the item start quickly. |
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Continuity controls the amount of continuous curve through a keyframe. Negative Continuity gives a sharper transition in the spline path at a keyframe, while a positive Continuity gives a broader transition (sometimes "over-continuous") through a keyframe. Negative Continuity is usually used to replicate a sharp change in motion. |
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Bias controls an item's lean to one side of the keyframe. In effect, the "slack" of the keyframe is moved from both sides of the keyframe to one or the other. A negative bias places the slack before the keyframe, positive places it after. |
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