ISRO | ISRO CS 2014 | Question 34

How much memory is required to implement z-buffer algorithm for a 512 x 512 x 24 bit-plane image?
(A) 768 KB
(B) 1 MB
(C) 1.5 MB
(D) 2 MB

Answer: (C)
Explanation: Z-buffer, which is also known as the Depth-buffer method is one of the commonly used method for hidden surface detection. Z-buffer requires 2 type of buffers to be filled: Depth buffer and Frame buffer
Space required by depth buffer = 512 x 512 x 24 = 6291456 bits.
Space required by frame buffer = 512 x 512 x 24 = 6291456 bits.
Total space required = 6291456 + 6291456 bits = 12582912 bits ≈ 1.5 MB

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