opensource/manim
1
0
Fork 0
mirror of https://github.com/3b1b/manim.git synced 2025-08-02 19:46:21 +08:00
Code Issues Packages Projects Releases Wiki Activity

Fixed z_to_vector for vectors on z-axis

Browse Source
This commit is contained in:
Grant Sanderson
2020-06-05 13:21:35 -07:00
parent cacfe67fe1
commit b2137f2746
1 changed files with 7 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
manimlib/utils/space_ops.py
View File

@ -137,11 +137,14 @@ def z_to_vector(vector):
Returns some matrix in SO(3) which takes the z-axis to the
(normalized) vector provided as an argument
"""
cp = cross(OUT, vector)
if get_norm(cp) == 0:
return np.identity(3)
axis = cross(OUT, vector)
if get_norm(axis) == 0:
if vector[2] > 0:
return np.identity(3)
else:
return rotation_matrix(PI, RIGHT)
angle = np.arccos(np.dot(OUT, normalize(vector)))
return rotation_matrix(angle, axis=cp)
return rotation_matrix(angle, axis=axis)
def angle_of_vector(vector):