Slerp() [2/2]

static void Microsoft.Xna.Framework.Quaternion.Slerp ( ref Quaternion quaternion1, ref Quaternion quaternion2, float amount, out Quaternion result )

inlinestatic

Definition at line 350 of file Quaternion.cs.

    {
        float num = quaternion1.X * quaternion2.X + quaternion1.Y * quaternion2.Y + quaternion1.Z * quaternion2.Z + quaternion1.W * quaternion2.W;
        bool flag = false;
        if (num < 0f)
        {
            flag = true;
            num = 0f - num;
        }
        float num2;
        float num3;
        if (num > 0.999999f)
        {
            num2 = 1f - amount;
            num3 = (flag ? (0f - amount) : amount);
        }
        else
        {
            float num4 = (float)Math.Acos(num);
            float num5 = (float)(1.0 / Math.Sin(num4));
            num2 = (float)Math.Sin((1f - amount) * num4) * num5;
            num3 = (flag ? ((float)(0.0 - Math.Sin(amount * num4)) * num5) : ((float)Math.Sin(amount * num4) * num5));
        }
        result.X = num2 * quaternion1.X + num3 * quaternion2.X;
        result.Y = num2 * quaternion1.Y + num3 * quaternion2.Y;
        result.Z = num2 * quaternion1.Z + num3 * quaternion2.Z;
        result.W = num2 * quaternion1.W + num3 * quaternion2.W;
    }

References System.Math.Acos(), and System.Math.Sin().