[Programming] Shadow Algorithm

20 12 2011

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Red: points projected to Y = 0
Black: min,max X of min,max Z
Green: max X
Blue: min X

The source code won’t be uploaded until optimized

So, It works like this:
1. Get all the vertices (position) [Indices of polygons don’t matter]
The prm loading’s source can be found in Tools -> nVolt
[projecting to Y = 0]
2. Sorting algorithm (I used Bubble sorting) [by Z]
3. get the min and the max [by Z], then min, max [by X]
we now get 4 points: that’s the rectangle (I used distance between .Z -> .Z)
4. Now We’re going to split virtually the points (into cubes-alike) [see Math explication for this]
5. Finally, We link all of them



vertex[] v = getVertices();
vector2D[] point;
For (i=0;i
point = Scalar_product(v[i],getVector(1,0,1));
BubbleSort(point); //sort by bubble
BubbleSort(SearchNeighborPoints(point[0]))[0]; //min
BubbleSort(SearchNeighborPoints(point[0])).getLatest(); //max



init <– 0
for i:= 0 to length(points) [or use Repeat..Until ; Do… While]We define |x| = max(-x,x)

|point[i].z – point[init].z| < n
n = Positif Constant  . We take it by “precision”
We shall repeat this until |point[i].z – point[init].z| >= n
then, we move to:
init <– i+ 1
and until (i > length(points) – 1)

Now, after getting the wanted, We bubble Sort the points
then We checked if the min is on the left and the max is on the right

We calculate the boundingbox then for that :
for X, Y then Z each separately (XYZ) we’ve got:
MAX <– max(MAX,point[i].XYZ)
MIN <– min (MIN, point[i].XYZ)

The center shall be:Center <– MAX/2 + MIN/2

if (MAX – Center).z >0 then everything is alright (same with (MIN-Center).z )
otherwise drop, not to include


Finally, we link the max_points (0->length(max)) then min_points (length(min) -> 0) or the opposite (0->length(min) then length(max)->0)



2 responses

21 12 2011
[Re-Volt] The PRM (car) Shader named AutoShader | Kallel Ahmed Yahia (theKDL)'s blog

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9 01 2012
[Programming] Shadow algorithm (for Re-Volt) | Kallel Ahmed Yahia (theKDL)'s blog

[…] [Programming] Shadow Algorithm (thekdl.wordpress.com) 34.745159 10.761300 Share this:ShareEmailFacebookTwitterDiggLike this:LikeBe the first to like this post. This entry was posted in Programming, Re-Volt, Visual Basic.NET 2008. Bookmark the permalink. […]

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