| public static Lerp ( JointAnimationKeyFrame frame1, JointAnimationKeyFrame frame2, float amount ) : JointAnimationKeyFrame | ||
| frame1 | JointAnimationKeyFrame | One keyframe |
| frame2 | JointAnimationKeyFrame | Another keyframe |
| amount | float | Weight of the second keyframe between 0.0 and 1.0 |
| return | JointAnimationKeyFrame | |
public static JointAnimationKeyFrame Lerp(JointAnimationKeyFrame frame1,
JointAnimationKeyFrame frame2, float amount)
{
// Lerp between components
Vector3 scale = Vector3.Lerp(frame1.Scale, frame2.Scale, amount);
Quaternion rotation = Quaternion.Lerp(frame1.Rotation, frame2.Rotation, amount);
Vector3 translation = Vector3.Lerp(frame1.Translation, frame2.Translation, amount);
// Lerp time
float time = frame1.Time + (frame2.Time - frame1.Time) * amount;
return new JointAnimationKeyFrame(time, scale, rotation, translation);
}
/// <summary>
/// Calculates a key frame at given time by interpolating between the samples
/// that are nearest (by time).
/// </summary>
/// <param name="time">Time</param>
/// <returns>Interpolated key frame for given time key</returns>
public JointAnimationKeyFrame GetInterpolatedKeyframe(float time)
{
if (time < StartTime)
{
switch (PreBehaviour)
{
case AnimationBehaviour.Constant:
time = StartTime;
break;
case AnimationBehaviour.Cycle:
time = 0;
break;
default:
// TODO: Implement other animation behaviours
throw new NotImplementedException("No animation behaviours " +
"other than Constant implemented yet");
}
}
else if (time > EndTime)
{
switch (PostBehaviour)
{
case AnimationBehaviour.Constant:
time = EndTime;
break;
case AnimationBehaviour.Cycle:
time %= EndTime;
break;
default:
// TODO: Implement other animation behaviours
throw new NotImplementedException("No animation behaviours " +
"other than Constant implemented yet");
}
}
int keyframeIndex = 0;
// Find the two frames to interpolate between
while (_keyframes[keyframeIndex].Time <= time)
{
keyframeIndex++;
}
if (keyframeIndex > 0)
{
keyframeIndex--;
}
JointAnimationKeyFrame frame1 = _keyframes[keyframeIndex];
JointAnimationKeyFrame frame2 = _keyframes[keyframeIndex + 1];
if (frame1.Time == time)
{
return(frame1);
}
switch (_interpolation)
{
case AnimationInterpolation.Linear:
float amount = 1.0f / (frame2.Time - frame1.Time) * (time - frame1.Time);
return(JointAnimationKeyFrame.Lerp(frame1, frame2, amount));
default:
// TODO: Implement other animation interpolations
throw new NotImplementedException("No animation interpolation " +
"other than Linear implemented yet");
}
}
