public Func <Vector4> DerivativeMiddle(UVDirection direction)
{
switch (direction)
{
case UVDirection.U0V01:
return(() => Dv(0, 0.5f));
case UVDirection.U0V10:
return(() => Dv(0, 0.5f));
case UVDirection.U1V01:
return(() => Dv(1, 0.5f));
case UVDirection.U1V10:
return(() => Dv(1, 0.5f));
case UVDirection.V0U01:
return(() => Du(0.5f, 0));
case UVDirection.V0U10:
return(() => Du(0.5f, 0));
case UVDirection.V1U01:
return(() => Du(0.5f, 1));
case UVDirection.V1U10:
return(() => Du(0.5f, 1));
}
return(() => new Vector4());
}
public Tuple <Func <Vector4>, Func <Vector4> > GetSecondDerivativeFuncs
(UVDirection direction, bool firstHalf)
{
switch (direction)
{
case UVDirection.U0V01:
if (firstHalf)
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(0, 0), () => DuDv(0, 0.5f)));
}
else
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(0, 0.5f), () => DuDv(0, 1)));
}
case UVDirection.U0V10:
if (firstHalf)
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(0, 1), () => DuDv(0, 0.5f)));
}
else
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(0, 0.5f), () => DuDv(0, 1)));
}
case UVDirection.U1V01:
if (firstHalf)
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(1, 0), () => DuDv(0, 0.5f)));
}
else
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(1, 0.5f), () => DuDv(1, 1)));
}
case UVDirection.U1V10:
if (firstHalf)
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(1, 1), () => DuDv(1, 0.5f)));
}
else
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(1, 0.5f), () => DuDv(1, 0)));
}
case UVDirection.V0U01:
if (firstHalf)
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(0, 0), () => DuDv(0.5f, 0)));
}
else
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(0.5f, 0), () => DuDv(1, 0)));
}
case UVDirection.V0U10:
if (firstHalf)
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(1, 0), () => DuDv(0.5f, 0)));
}
else
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(0.5f, 0), () => DuDv(0, 0)));
}
case UVDirection.V1U01:
if (firstHalf)
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(0, 1), () => DuDv(0.5f, 1)));
}
else
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(0.5f, 1), () => DuDv(1, 1)));
}
case UVDirection.V1U10:
if (firstHalf)
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(1, 1), () => DuDv(0.5f, 1)));
}
else
{
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => DuDv(0.5f, 1), () => DuDv(0, 1)));
}
}
return(new Tuple <Func <Vector4>, Func <Vector4> >(() => new Vector4(), () => new Vector4()));
}
public Func <float, Vector4> GetDerivativeFunc(UVDirection direction, bool firstHalf)
{
switch (direction)
{
case UVDirection.U0V01:
if (firstHalf)
{
return(f => Du(0, f / 2));
}
else
{
return(f => Du(0, f / 2 + 0.5f));
}
case UVDirection.U0V10:
if (firstHalf)
{
return(f => Du(0, 1 - f / 2));
}
else
{
return(f => Du(0, 0.5f - f / 2));
}
case UVDirection.U1V01:
if (firstHalf)
{
return(f => Du(1, f / 2));
}
else
{
return(f => Du(1, f / 2 + 0.5f));
}
case UVDirection.U1V10:
if (firstHalf)
{
return(f => Du(1, 1 - f / 2));
}
else
{
return(f => Du(1, 0.5f - f / 2));
}
case UVDirection.V0U01:
if (firstHalf)
{
return(f => Dv(f / 2, 0));
}
else
{
return(f => Dv(0.5f + f / 2, 0));
}
case UVDirection.V0U10:
if (firstHalf)
{
return(f => Dv(1 - f / 2, 0));
}
else
{
return(f => Dv(0.5f - f / 2, 0));
}
case UVDirection.V1U01:
if (firstHalf)
{
return(f => Dv(f / 2, 1));
}
else
{
return(f => Dv(0.5f + f / 2, 1));
}
case UVDirection.V1U10:
if (firstHalf)
{
return(f => Dv(1 - f / 2, 1));
}
else
{
return(f => Dv(0.5f - f / 2, 1));
}
}
return(f => new Vector4());
}