lookAt missing?

[pocdn]

Here's a missing function lookAt found in the original glm c++ file matrix_transform.inl. Would you consider adding it to your matrix_transform.py file?

You also did not implement cross-function so I just did it in line for the lookAt only.

def lookAt(eye, center, up):
    """Creates a viewing matrix. The matrix maps the reference point to 
    the negative z axis and the eye point to the origin. When a typical 
    projection matrix is used, the center of the scene therefore maps to 
    the center of the viewport. Similarly, the direction described by the 
    UP vector projected onto the viewing plane is mapped to the positive y 
    axis so that it points upward in the viewport. The UP vector must not be 
    parallel to the line of sight from the eye point to the reference point.
    :param Vec3 eye: Specifies the position of the eye point 
    :param Vec3 center: Reference point indicating the center of the scene 
    :param Vec3 up: Up direction
    :rtype: Mat4x4"""

    def cross( a, b):
        return Vec3(a.y*b.z-a.z*b.y, -(a.x*b.z-a.z*b.x), a.x*b.y-a.y*b.x)

    f = normalize(center - eye)
    s = normalize(cross(f, up))
    u = cross(s, f)

    Result = Mat4x4(1.0)
    Result[0][0] = s.x
    Result[1][0] = s.y
    Result[2][0] = s.z
    Result[0][1] = u.x
    Result[1][1] = u.y
    Result[2][1] = u.z
    Result[0][2] =-f.x
    Result[1][2] =-f.y
    Result[2][2] =-f.z
    Result[3][0] =-dot(s, eye)
    Result[3][1] =-dot(u, eye)
    Result[3][2] = dot(f, eye)
    return Result

[mackst]

Done and thank you.

I keep this repo because some of the opengl samples were using it. Maybe I will pickup this repo again in someday. Who knows.

[pocdn]

Thanks for adding "lookAt" function.

Your library is very helpful. I was missing the glm style of working with openGL/Vulkan transformations when working in python, rather than my more familiar cpp. Thanks again.