lookat

matrix3  lookat(vector from, vector to)

matrix3  lookat(vector from, vector to, float roll)

matrix3  lookat(vector from, vector to, vector up)

vector  lookat(vector from, vector to, float roll, int xyz)

vector  lookat(vector from, vector to, vector up, int xyz)

Computes a rotation matrix or angles to orient the negative z-axis along the vector (to-from) under the transformation. If an up vector is specified, this will determine the roll.

xyz

One of the rotation order constants listed below, which can be imported from $HFS/houdini/vex/include/math.h.

Constant name	Rotation Order
XFORM_XYZ	Rotate order X, Y, Z
XFORM_XZY	Rotate order X, Z, Y
XFORM_YXZ	Rotate order Y, X, Z
XFORM_YZX	Rotate order Y, Z, X
XFORM_ZXY	Rotate order Z, X, Y
XFORM_ZYX	Rotate order Z, Y, X