Example which cause problems for hidden-surface algorithms, Data Structure & Algorithms

Assignment Help:

Example which cause problems for some hidden-surface algorithms

Some special cases, which cause problems for some hidden-surface algorithms, are penetrating faces and cyclic overlap. A penetrating face occurs when polygon A passes through polygon B. Cyclic overlap occurs when polygon A is in front of polygon B, which is in front of polygon C, which is in front of Polygon A. Actually, we need only two polygons for cyclic overlap; imagine a rectangle threaded through a polygon shaped like the letter C so that it is behind the top of the C but in front of the bottom part. For the various hidden-surface methods we have presented, discuss whether or not they can handle penetrating faces and cyclic overlap.

(b)  (i) Show that no polygon subdivision takes place in applying the binary space partition method to a convex object.

(ii)  For the case of convex object compare the cost of the back-face removal method with that of the binary space partition method for a single view.

(iii)  Suppose we wish to display a sequence of views of a convex object. How would the cost of using back-face removal compare to the binary space partition scheme?

(c)  Modify the back-face algorithm for unifilled polygons so that instead of removing back faces it draws them in a less pronounced line style (e.g., as dashed lines).

(d)  Test the painter's algorithm by showing several filled polygons with different interior styles and different states of overlap, entered in mixed order.

(e)  Test the painter's algorithm by showing two houses composed of filled polygons with different interior styles. Select a view such that one house partially obscures the other house.

(f) Sketch the minimax boxes for the tangent polygons shown in figure. What conclusions can you make?

 

642_data structure.png


Related Discussions:- Example which cause problems for hidden-surface algorithms

Depth first search, DEPTH FIRST SEARCH (DFS) The approach adopted into ...

DEPTH FIRST SEARCH (DFS) The approach adopted into depth first search is to search deeper whenever possible. This algorithm frequently searches deeper through visiting unvisite

Define minimum spanning tree, Define Minimum Spanning Tree A minimum sp...

Define Minimum Spanning Tree A minimum spanning tree of a weighted linked graph is its spanning tree of the smallest weight, where the weight of a tree is explained as the sum

Algorithm.., write an algorithm to sort given numbers in ascending order us...

write an algorithm to sort given numbers in ascending order using bubble sort

Algorithm for pre-order traversal, Hear is given a set of input representin...

Hear is given a set of input representing the nodes of a binary tree, write a non recursive algorithm that must be able to give the output in three traversal orders. Write down an

Explain best - fit method, Best - Fit Method: - This method obtains the sma...

Best - Fit Method: - This method obtains the smallest free block whose  size is greater than or equal to get such a block by traversing the whole free list follows.

Determine the precondition of a binary search, Determine the precondition o...

Determine the precondition of a binary search For instance, precondition of a binary search is that array searched is sorted however checking this precondition is so expensive

Explain thread, Thread By changing the NULL lines in a binary tree to ...

Thread By changing the NULL lines in a binary tree to special links known as threads, it is possible to perform traversal, insertion and deletion without using either a stack

Degree of node, Q. The degree of a node is defined as the number of childre...

Q. The degree of a node is defined as the number of children it has. Shear show that in any binary tree, the total number of leaves is one more than the number of nodes of degree 2

Explain time complexity, Time Complexity:- The time complexity of an algori...

Time Complexity:- The time complexity of an algorithm is the amount of time it requires to run to completion. Some of the reasons for studying time complexity are:- We may be in

First class Abstract data type , 3. A function to convert a complex number ...

3. A function to convert a complex number in algebraic form to a complex number in phasor form

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd