4 votes 4 votes Which of the following is true about $z$-buffer algorithm? It is a depth sort algorithm No limitation on total number of objects Comparisons of objects is done $z$-buffer is initialized to background colour at start of algorithm Computer Graphics isro2011 non-gate computer-graphics + – go_editor asked Jun 21, 2016 • edited Dec 8, 2022 by Lakshman Bhaiya go_editor 4.8k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
10 votes 10 votes A is definitely not true Z-buffer is not depth sort it is depth buffer . Painters algorithm is called depth sort or priority algorithm B is true in Z-buffer algo total number of objects can be arbitrary large . it is only limited by computer memory C is not true objects are not compared only depth value is comapred D is not true z-buffer is initialize to zero the depth of back clipping plane screen(frame buffer is initialized to background color) hence ans is B refer https://books.google.co.in/books?id=-4ngT05gmAQC&pg=PA671&lpg=PA671&dq=comparisons+of+objects+is+done+in+z-buffer+algorithm&source=bl&ots=QXMndZkxra&sig=HcfsOws81klvkm2oBVbv7hMXzrg&hl=en&sa=X&ved=0ahUKEwiDk7Kdh4bRAhUGSY8KHf-gAjUQ6AEIRTAH#v=onepage&q=comparisons%20of%20objects%20is%20done%20in%20z-buffer%20algorithm&f=false Sanjay Sharma answered Dec 21, 2016 Sanjay Sharma comment Share Follow See 1 comment See all 1 1 comment reply Utsav09 commented Mar 31, 2018 reply Follow Share z buffer is initilized to infinity i guess? then the depths of each pixel of the polygon are compared with the values. 1 votes 1 votes Please log in or register to add a comment.
4 votes 4 votes Answer : It is a depth Sort algorithm .I don't know much about it .So i can't tell you the details .You can refer it if you want to learn more about it. Reference :: http://www.tutorialspoint.com/computer_graphics/visible_surface_detection.htm shekhar chauhan answered Jun 20, 2016 shekhar chauhan comment Share Follow See all 0 reply Please log in or register to add a comment.
4 votes 4 votes Answer is D). z buffer is a depth buffer algorithm in which it is initialized to background colour at the start . It is used for hidden surface elimination. Kapil answered Jun 21, 2016 Kapil comment Share Follow See all 0 reply Please log in or register to add a comment.
1 votes 1 votes It should be A , not D. Primary purpose is to determine visual surface first and then remove background hidden surface. http://whatis.techtarget.com/definition/z-buffering pps121 answered Jul 2, 2016 pps121 comment Share Follow See all 0 reply Please log in or register to add a comment.