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56 lines
1.4 KiB
Python
56 lines
1.4 KiB
Python
import numpy as np
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from manimlib.constants import ORIGIN
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from manimlib.utils.space_ops import get_unit_normal
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def get_3d_vmob_gradient_start_and_end_points(vmob):
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return (
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get_3d_vmob_start_corner(vmob),
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get_3d_vmob_end_corner(vmob),
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)
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def get_3d_vmob_start_corner_index(vmob):
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return 0
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def get_3d_vmob_end_corner_index(vmob):
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return ((len(vmob.points) - 1) // 6) * 3
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def get_3d_vmob_start_corner(vmob):
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if vmob.get_num_points() == 0:
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return np.array(ORIGIN)
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return vmob.points[get_3d_vmob_start_corner_index(vmob)]
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def get_3d_vmob_end_corner(vmob):
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if vmob.get_num_points() == 0:
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return np.array(ORIGIN)
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return vmob.points[get_3d_vmob_end_corner_index(vmob)]
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def get_3d_vmob_unit_normal(vmob, point_index):
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n_points = vmob.get_num_points()
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if vmob.get_num_points() == 0:
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return np.array(ORIGIN)
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i = point_index
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im1 = i - 1 if i > 0 else (n_points - 2)
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ip1 = i + 1 if i < (n_points - 1) else 1
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return get_unit_normal(
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vmob.points[ip1] - vmob.points[i],
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vmob.points[im1] - vmob.points[i],
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)
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def get_3d_vmob_start_corner_unit_normal(vmob):
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return get_3d_vmob_unit_normal(
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vmob, get_3d_vmob_start_corner_index(vmob)
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)
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def get_3d_vmob_end_corner_unit_normal(vmob):
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return get_3d_vmob_unit_normal(
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vmob, get_3d_vmob_end_corner_index(vmob)
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)
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