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Allow for specifying true normals and orientation of Sphere

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This commit is contained in:
Grant Sanderson 2025-02-07 10:17:51 -06:00
parent 46c898977a
commit 054865569e
1 changed files with 8 additions and 3 deletions
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11
manimlib/mobject/three_dimensions.py
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@ -97,9 +97,12 @@ class Sphere(Surface):
v_range: Tuple[float, float] = (0, PI),
resolution: Tuple[int, int] = (101, 51),
radius: float = 1.0,
true_normals: bool = True,
clockwise=False,
**kwargs,
):
self.radius = radius
self.clockwise = clockwise
super().__init__(
u_range=u_range,
v_range=v_range,
@ -107,12 +110,14 @@ class Sphere(Surface):
**kwargs
)
# Add bespoke normal specification to avoid issue at poles
self.data['d_normal_point'] = self.data['point'] * ((radius + self.normal_nudge) / radius)
if true_normals:
self.data['d_normal_point'] = self.data['point'] * ((radius + self.normal_nudge) / radius)
def uv_func(self, u: float, v: float) -> np.ndarray:
sign = -1 if self.clockwise else +1
return self.radius * np.array([
math.cos(u) * math.sin(v),
math.sin(u) * math.sin(v),
math.cos(sign * u) * math.sin(v),
math.sin(sign * u) * math.sin(v),
-math.cos(v)
])