Exemple #1
0
        public static quaternion operator *(quaternion a, quaternion b)
        {
            quaternion r = new quaternion();

            r.s = a.s * b.s - (a.v * b.v);
            r.v = (a.s * b.v) + (a.v * b.s) + (a.v % b.v);

            return r;
        }
Exemple #2
0
        public vect3d transformPoint(ref vect3d p)
        {
            vect3d vecTemp = p;
            double mag = -(vecTemp * v);

            vecTemp = ((vecTemp * s) + ((v % vecTemp)));
            quaternion temp = new quaternion(mag, vecTemp);

            return (temp * conjugate()).v;
        }
Exemple #3
0
        quaternion slerp(ref quaternion q1, ref quaternion q2, double t)
        {
            double[] temp = new double[4];
            double omega, cosom, sinom, scale0, scale1;
            quaternion rvalue;

            // calc cosine
            cosom = q1.s * q2.s + q1.v.x * q2.v.x + q1.v.y * q2.v.y + q1.v.z * q2.v.z;

            // adjust signs (if necessary)
            if (cosom < 0.0)
            {
                cosom = -1.0 * cosom;
                temp[0] = -1.0 * q2.s;
                temp[1] = -1.0 * q2.v.x;
                temp[2] = -1.0 * q2.v.y;
                temp[3] = -1.0 * q2.v.z;
            }
            else
            {
                temp[0] = q2.s;
                temp[1] = q2.v.x;
                temp[2] = q2.v.y;
                temp[3] = q2.v.z;
            }

            // calculate coefficients
            if ((1.0 - cosom) > 0.001)
            {
                // standard case (slerp)
                omega = System.Math.Acos(cosom);
                sinom = System.Math.Sin(omega);
                scale0 = System.Math.Sin((1.0 - t) * omega) / sinom;
                scale1 = System.Math.Sin(t * omega) / sinom;
            }
            else
            {
                // q1 and q2 are about 1 degree apart so use linear
                // interpolation to avoid division by very small numbers
                scale0 = 1.0 - t;
                scale1 = t;
            }

            // do the interpolation
            rvalue.s = scale0 * q1.s + scale1 * temp[0];
            rvalue.v.x = scale0 * q1.v.x + scale1 * temp[1];
            rvalue.v.y = scale0 * q1.v.y + scale1 * temp[2];
            rvalue.v.z = scale0 * q1.v.z + scale1 * temp[3];

            return rvalue;
        }