29 lines
693 B
Python
29 lines
693 B
Python
import numpy as np
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I_lambda = np.array([1, 0, 0])
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I_dc_lambda = np.array([0, 0, 0])
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a_min = 0.0
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a_max = 1.0
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d_near = 1.0
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d_far = 21.0
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eye = np.array([0, 0, 0])
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def dist(a, b):
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return np.linalg.norm(b - a, 2)
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def a_dc(d_obj):
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if d_obj < d_near: return a_max
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elif d_obj > d_far: return a_min
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return a_min + (a_max - a_min) * (d_far - d_obj) / (d_far - d_near)
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def get_color(point):
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d_obj = dist(eye, point)
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I_lambda_prime = a_dc(d_obj) * I_lambda + (1 - a_dc(d_obj)) * I_dc_lambda
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return I_lambda_prime
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print(get_color(np.array([1, 0, 0]))) # [1, 0, 0]
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print(get_color(np.array([5, 0, 0]))) # [0.8, 0, 0]
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print(get_color(np.array([20, 0, 0]))) # [0.05, 0, 0]
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