public BasicFCurve()
{
KeyFrames = null ;
DimCount = 0 ;
KeyCount = 0 ;
InterpType = BasicFCurveInterpType.Constant ;
TargetType = BasicFCurveTargetType.None ;
ChannelType = BasicFCurveChannelType.None ;
TargetIndex = -1 ;
}
void EvalFCurve(BasicFCurve fcurve, float frame, float[] result)
{
float[] data = fcurve.KeyFrames;
int lower = 0;
int upper = fcurve.KeyCount - 1;
int elementStride = fcurveElementStrides[(int)fcurve.InterpType];
int stride = elementStride * fcurve.DimCount + 1;
while (upper - lower > 1)
{
int center = (upper + lower) / 2;
float frame2 = data[stride * center];
if (frame < frame2)
{
upper = center;
}
else
{
lower = center;
}
}
int k1 = stride * lower;
int k2 = stride * upper;
float f1 = data[k1++];
float f2 = data[k2++];
float t = f2 - f1;
if (t != 0.0f)
{
t = (frame - f1) / t;
}
BasicFCurveInterpType interp = fcurve.InterpType;
if (t <= 0.0f)
{
interp = BasicFCurveInterpType.Constant;
}
if (t >= 1.0f)
{
interp = BasicFCurveInterpType.Constant;
k1 = k2;
}
switch (interp)
{
case BasicFCurveInterpType.Constant:
for (int i = 0; i < fcurve.DimCount; i++)
{
result[i] = data[k1];
k1 += elementStride;
}
break;
case BasicFCurveInterpType.Linear:
for (int i = 0; i < fcurve.DimCount; i++)
{
float v1 = data[k1++];
float v2 = data[k2++];
result[i] = (v2 - v1) * t + v1;
}
break;
case BasicFCurveInterpType.Hermite:
float s = 1.0f - t;
float b1 = s * s * t * 3.0f;
float b2 = t * t * s * 3.0f;
float b0 = s * s * s + b1;
float b3 = t * t * t + b2;
for (int i = 0; i < fcurve.DimCount; i++)
{
result[i] = data[k1] * b0 + data[k1 + 2] * b1 + data[k2 + 1] * b2 + data[k2] * b3;
k1 += 3;
k2 += 3;
}
break;
case BasicFCurveInterpType.Cubic:
for (int i = 0; i < fcurve.DimCount; i++)
{
float fa = f1 + data[k1 + 3];
float fb = f2 + data[k2 + 1];
float u = FindCubicRoot(f1, fa, fb, f2, frame);
float v = 1.0f - u;
float c1 = v * v * u * 3.0f;
float c2 = u * u * v * 3.0f;
float c0 = v * v * v + c1;
float c3 = u * u * u + c2;
result[i] = data[k1] * c0 + data[k1 + 4] * c1 + data[k2 + 2] * c2 + data[k2] * c3;
k1 += 5;
k2 += 5;
}
break;
case BasicFCurveInterpType.Spherical:
var q1 = new Quaternion(data[k1 + 0], data[k1 + 1], data[k1 + 2], data[k1 + 3]);
var q2 = new Quaternion(data[k2 + 0], data[k2 + 1], data[k2 + 2], data[k2 + 3]);
// [note] 旧API
// var q3 = Quaternion.Slerp( q1, q2, t, 0.0f ) ;
var q3 = q1.Slerp(q2, t);
result[0] = q3.X;
result[1] = q3.Y;
result[2] = q3.Z;
result[3] = q3.W;
break;
}
}
