ray/lib/cyl.cal

{
        cyl.cal - 2d coordinate mapping onto cylinder.

        Unit radius cylinder with axis along z.

        A1 = picture height/width
        A2 = unit scale for pattern
}

cyl_u = (atan2(Py,Px)+PI)/A2;
cyl_v = Pz/A2;

cyl_tile_u = mod(cyl_u,pic_width);
cyl_tile_v = mod(cyl_v,pic_height);

cyl_match_u = tri(cyl_u,pic_width);
cyl_match_v = tri(cyl_v,pic_height);

pic_width = max(1,1/A1);
pic_height = max(1,A1);
Revision:	1.2
Committed:	Tue Mar 18 17:30:17 2003 UTC (22 years, 1 month ago) by greg
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.1:	+0 -0 lines
State:	*FILE REMOVED*
Log Message:	Decided to move ray/lib directory into non-CVS distribution
#	User	Rev	Content
1	greg	1.1	{
2			cyl.cal - 2d coordinate mapping onto cylinder.
3
4			Unit radius cylinder with axis along z.
5
6			A1 = picture height/width
7			A2 = unit scale for pattern
8			}
9
10			cyl_u = (atan2(Py,Px)+PI)/A2;
11			cyl_v = Pz/A2;
12
13			cyl_tile_u = mod(cyl_u,pic_width);
14			cyl_tile_v = mod(cyl_v,pic_height);
15
16			cyl_match_u = tri(cyl_u,pic_width);
17			cyl_match_v = tri(cyl_v,pic_height);
18
19			pic_width = max(1,1/A1);
20			pic_height = max(1,A1);