Patent ID: 6154221
Filing Date: 2000-11-28
Classification: G06T

Abstract:
A method for modifying parameters of an animated variable, comprising the steps of:(i) providing a parametric function curve for modelling values of an animated variable over time;(ii) initializing tangent handles at each of a first and a second key located on the parametric function curve;(iii) selecting one of the tangent handles;(iv) dragging the selected tangent handle to a new position to modify the parametric function curve;(v) up-dating the parametric function curve responsive to the new position;(vi) verifying whether the domain of the up-dated parametric function curve is monotonic;(vii) if not monotonic, repeatedly modifying the parametric function curve until its domain is monotonic; and(viii) rendering the animated variable in accordance with the modified parametric function curve.