Gain Momentum & Damp

• Before applying Refine Keys, you first need to pick a threshold value ranging from 0 to 1.
• Refine Keys is applied with the technique of curve fitting while the threshold stands for the curve fitting error threshold.  Essentially, threshold affects the accuracy for the resultant curve compared with the original curve.
• A larger threshold value results in less accurate curve fitting (the motion curve may become smoother but may deviate quite a bit from the original curve, see the figure in the next page).  By contrast, a smaller threshold will create a curve with better fidelity.
• As a consequence, higher threshold values result in less keys, while lower threshold values result in more keys (see figure in the next page).
• The "Preview Key Information" checkbox gives you the option to see the amount of keys prior to and after threshold optimization.