def _LookAtMatrix(at, eye, up=[0, 1, 0], reflect=False):
"""Define a matrix looking at.
Arguments:
*at*
tuple (x,y,z) of point camera pointed at, floats
*eye*
matrix [x,y,z] position of camera, floats
Keyword arguments:
*up*
array vector of up direction
*eflect*
boolean if matrix is reflected
"""
# If reflect, then reflect in plane -20.0 (water depth)
if reflect:
depth = -20.0 # Shallower to avoid edge effects
eye = [eye[0], -eye[1], eye[2]]
at = [at[0], -at[1], at[2]]
zaxis = vec_normal(vec_sub(at, eye))
xaxis = vec_normal(vec_cross(up, zaxis))
yaxis = vec_cross(zaxis, xaxis)
xaxis.append(-vec_dot(xaxis, eye))
yaxis.append(-vec_dot(yaxis, eye))
zaxis.append(-vec_dot(zaxis, eye))
z = [0, 0, 0, 1.0]
return array([[xaxis[a], yaxis[a], zaxis[a], z[a]] for a in range(4)],
dtype=ctypes.c_float)
def _LookAtMatrix(at, eye, up=[0, 1, 0], reflect=False):
"""Define a matrix looking at.
Arguments:
*at*
tuple (x,y,z) of point camera pointed at, floats
*eye*
matrix [x,y,z] position of camera, floats
Keyword arguments:
*up*
array vector of up direction
*eflect*
boolean if matrix is reflected
"""
# If reflect, then reflect in plane -20.0 (water depth)
if reflect:
depth = -20.0 # Shallower to avoid edge effects
eye[1] *= -1
at[1] *= -1
zaxis = vec_normal(vec_sub(at, eye))
xaxis = vec_normal(vec_cross(up, zaxis))
yaxis = vec_cross(zaxis, xaxis)
xaxis.append(-vec_dot(xaxis, eye))
yaxis.append(-vec_dot(yaxis, eye))
zaxis.append(-vec_dot(zaxis, eye))
z = [0, 0, 0, 1.0]
return np.array([[xaxis[a], yaxis[a], zaxis[a], z[a]] for a in range(4)],
dtype="float32")
