Which of the following statements is/are INCORRECT about the Z-buffer algorithm in computer graphics?
Statements:
i) It is an image space method to detect visible surface.
ii) In this method, a depth buffer is used to store the depth values of each position and a refresh (frame) buffer is used to store the intensity values or colour values for each position.
iii) In this method, object edges can be anti aliased.
iv) This method can only find one visible surface at each pixel position.
DSSSB TGT - 2023,
Answer: D
Only statement iii is incorrect. The Z-buffer algorithm is an image-space method of detecting visible surfaces (i), and it keeps a depth buffer for the depth value of each position and a refresh (frame) buffer for the intensity or colour (ii). It finds only one visible surface at each pixel position (iv), and because it keeps no information about the surfaces behind it, object edges cannot be anti-aliased, so statement iii is the false one. The other options mark true statements as incorrect.
Please log in or register to report this question.