Set y to the first non-empty bucket in the ET. After updating edges the active edge table is traversed in X order to emit only the visible spans maintaining a Z-sorted active Span table inserting and deleting the surfaces when edges are crossed.
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Changing of active edge list as a 5-sided polygon is scan converted.
Active edge table in computer graphics. This should also contain ordered edges. Edge Buckets an Edge Table and an Active List. Re-sorting the active edge table seems to happen frequently but it typically isnt expensive.
This is bucket 1 in the example. The edge list or edge table contains the coordinate of two endpoints. Active edge table entries are maintained in an X-sorted list by bubble sort effecting a change when 2 edges cross.
If any edges have a yMin current scan. Q11- Active edge table is used in following algorithm. Label the fields for one edge box.
Starting with the initial scan-line until the active edge table is empty do the following. CD is the pointer to bottom of active edges. Active Edge List AEL contain edges a given scan line intersects during its sweep.
CB is the pointer to top of active edges. Active edge table entries are maintained in an X-sorted list by bubble sort effecting a change when 2 edges cross. Set Active Edge Table AET to be empty repeat until AET and ET are empty move edges in ET with Ymin y into AET new edges sort AET on x AET will eventually include new and old values use list of x coordinates to fill spans remove entries in AET with ymax y edges you are finished with.
List of edges that intersect with current scan line sorted by x. Once you have your Edge Table ET for the polygon youre ready to step through y coordinates and render scan lines. The global edge table is ordered on minimum y and x values search through the global edge table and for each edge found having a minimum y value equal to the current scan.
If an edge is removed from the AL remove the associated the Edge Bucket from the Edge Table. The active edge table entries have X and other parameter information incremented. Computer Graphics WS0708 Rendering with Rasterization Scanline Algorithm For each scan line Update the Active-Edge-Table Linked-list of entries Link to edge-entries x horizontal increment of depth color etc Remove edges if theirs ymax is reached Insert new edges from Edge-Table Sorting Incremental update of x.
Numerical Scan Line Polygon fill Part 2 Making GLOBALACTIVE EDGE TABLE Computer Graphics. Show the name and data box for each edge. 17-Jul-01 240-422 Computer Graphics.
The AET keeps track of which edges cross the current y scan line. These components will contain an edges information hold all of the edges that compose the figure and maintain the current edges being used to. Draw all pixels from the x value of odd to the x value of even parity edge pairs 2.
This allows the intersection points to be paired off and be used for filling the scanline appropriately. Increment the scan-line by 1 3. These intersection points are sorted by increasing x coordinate.
Show the data box for each edge at each level where it is active. This is initially set up as follows. The active edge list AEL should be sorted in increasing order of x.
A bucket sorted table that stores list of all edges AET. Lecture 5 Filling ellipses and Thick Primitives 819 Edge Table and Active Edge Table ET. The active-edge table is a data structure that consists of all the intersection points of the edges with the current scanline.
In particular if you have introduced a new edge in step 31 then you will need to move it to its correct position in the table. Initialize the Active Edge Table AET to be empty. Starting with the lowest scanline and working up show which edges are in the Current Scanline Buffer Active Edge Table at each level.
However this is only done at events in fact only once per edge of the polygon. DE is the pointer to top of active edges. Initializing the Active Edge Table The active edge table will be used to keep track of the edges that are intersected by the current scan-line.
Remove any edges from the active edge table for which the maximum y value is equal to the scan line f. After updating edges the active edge table is traversed in X order to emit only the visible spans maintaining a Z-sorted active Span table inserting and deleting the surfaces when edges are crossed. To successfully fill in a polygon three main components will be used.
O Sorted list of edges by Ytop o List 1. One to the first active edge second to the last active edge eg.
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