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| def sphere_intersect(center, radius, ray_origin, ray_direction): | |
| b = 2 * np.dot(ray_direction, ray_origin - center) | |
| c = np.linalg.norm(ray_origin - center) ** 2 - radius ** 2 | |
| delta = b ** 2 - 4 * c | |
| if delta > 0: | |
| t1 = (-b + np.sqrt(delta)) / 2 | |
| t2 = (-b - np.sqrt(delta)) / 2 | |
| if t1 > 0 and t2 > 0: | |
| return min(t1, t2) | |
| return None |
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