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A few 3d updates

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This commit is contained in:
Grant Sanderson
2017-02-13 18:43:55 -08:00
parent 3fb8c4b0d2
commit ef47e6e884
9 changed files with 235 additions and 173 deletions
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4
helpers.py
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@ -318,7 +318,7 @@ def random_color():
def straight_path(start_points, end_points, alpha):
return interpolate(start_points, end_points, alpha)
def path_along_arc(arc_angle):
def path_along_arc(arc_angle, axis = OUT):
"""
If vect is vector from start to end, [vect[:,1], -vect[:,0]] is
perpendicualr to vect in the left direction.
@ -333,7 +333,7 @@ def path_along_arc(arc_angle):
centers[:,i] += 0.5*b*vects[:,1-i]/np.tan(arc_angle/2)
return centers + np.dot(
start_points-centers,
np.transpose(rotation_about_z(alpha*arc_angle))
np.transpose(rotation_matrix(alpha*arc_angle, axis))
)
return path