vec_mul()

vec_mul	(	struct vector *	vdest,
		const struct vector	v,
		DOUBLE	d
	)

Scales the vector with a scalar. Input vector is not overwritten.

Parameters

[out]	vdest	scaled vector
[in]	v	vector
[in]	d	scalar factor.

                                                                  {
  vdest->x = v.x*d;
  vdest->y = v.y*d;
  vdest->z = v.z*d;

}