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  Vec3f image[TEX_SIZE][TEX_SIZE];
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  Vec3f image[TEX_SIZE][TEX_SIZE];
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  unsigned int image_tex;
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  unsigned int image_tex;
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  // Function to generate a random number between 0 and 1.
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  // Function to generate a random number between 0 and 1.
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  // rand() returns a random number ranging from 0 to RAND_MAX.
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  // gel_rand() returns a random number ranging from 0 to GEL_RAND_MAX.
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  inline double my_random()
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  inline double my_random()
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  {
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  {
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    return rand()/static_cast<double>(RAND_MAX);
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    return gel_rand()/static_cast<double>(GEL_RAND_MAX);
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  }
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  }
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  AABBTree bb_tree;
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  AABBTree bb_tree;
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}
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}
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