What is scan line algorithm in computer graphics?
Scanline rendering (also scan line rendering and scan-line rendering) is an algorithm for visible surface determination, in 3D computer graphics, that works on a row-by-row basis rather than a polygon-by-polygon or pixel-by-pixel basis.
Why we use scan line algorithm?
It processes one line at a time rather than one pixel at a time. It uses the concept area of coherence. This algorithm records edge list, active edge list. So accurate bookkeeping is necessary.
Which of the following is true about scan line algorithm?
In scan line algorithm, Scan lines are processed in increasing (upward) / decreasing (downward) ————————–….
| Q. | Which of the following is true about scan line algorithm? |
|---|---|
| B. | it works at pixel level |
| C. | it uses scan lines to fill the polygon |
| D. | all of above |
| Answer» c. it uses scan lines to fill the polygon |
How many tables are used in scan line method?
In scan line algorithm we create two tables, first one is known as polygon table which is different for each and every polygon and the other one is known as edge table.
What are the advantages and drawbacks of scan line polygon fill algorithm?
1) It is a more complex algorithm. 2) It requires all polygons sent to renderer before drawing….Expert-verified answer question
- It takes advantage of coherence resulting in fast algorithm.
- It does require as much storage as depth buffer.
- It only draws visible pixels.
- This algorithm is common in software.
What are the advantages of scan line polygon fill algorithm?
Advantage of scan-line fill: It does fill in the same order as rendering, and so can be pipelined. Scan Line Fill: What happens at edge end-point? Edge endpoint is duplicated. In other words, when a scan line intersects an edge endpoint, it intersects two edges.
Which data structure is used in scan line method to represent the edges?
Data Structure Used By Scan-Line Algorithm. 2. Active edges table(list): This table contains all those edges of the polygon that are intersected(crossed) by the current scan-line. The edges are dropped into the table in a sorted manner(Increasing value of x).
What is advantage and disadvantage of scan line filling algorithm?
The advantages of Scan line algorithm are as follows:= 1) It takes advantage of coherence resulting in fast algorithm. 2) It does require as much storage as depth buffer. 3) It only draws visible pixels. 4) This algorithm is common in software.
Which data structure is used by the scan line polygon fill algorithm?
Scanline Polygon filling Algorithm This algorithm works by intersecting scanline with polygon edges and fills the polygon between pairs of intersections.
What is scan line algorithm in 3D (hidden surface removal)?
Computer Graphics – Scan Line Algorithm in 3D (Hidden Surface Removal) Last Updated : 14 Feb, 2021 This algorithm is based on the Image-space method and concept of coherence. As its name suggests itself Scan-line algorithm, so it processes one line at a time rather than processing one pixel (a point on raster display) at a time.
What is scan-line algorithm?
This algorithm is based on the Image-space method and concept of coherence. As its name suggests itself Scan-line algorithm, so it processes one line at a time rather than processing one pixel (a point on raster display) at a time. The algorithm works as follows:
What is the edge list algorithm in image processing?
It is an image space algorithm. It processes one line at a time rather than one pixel at a time. It uses the concept area of coherence. This algorithm records edge list, active edge list. So accurate bookkeeping is necessary. The edge list or edge table contains the coordinate of two endpoints.
Which edges of the scan line are stored by the active list?
Only the edges that cross the scan line is stored by the active list. For indicating whether the position along a scan line is inside or outside the surface, a flag is set. Each of the scan line is processes from left to right. The surface flag is turned on at left intersection and at right intersection it is turned off. 3