From 44f78eb18e851892f72b41be4119cf8b14cddbbb Mon Sep 17 00:00:00 2001 From: Kristian Høgsberg Date: Thu, 25 Feb 2010 16:20:03 -0500 Subject: Remove unused mini and mesa glu subdirectories --- src/glu/mesa/README2 | 43 ------------------------------------------- 1 file changed, 43 deletions(-) delete mode 100644 src/glu/mesa/README2 (limited to 'src/glu/mesa/README2') diff --git a/src/glu/mesa/README2 b/src/glu/mesa/README2 deleted file mode 100644 index 3c9959179b..0000000000 --- a/src/glu/mesa/README2 +++ /dev/null @@ -1,43 +0,0 @@ -The current NURBS implementation has no trimming facilities yet. - -The code is not well commented. - -1) Normal calculus fails for special cases of NURBS (independent - of the NURBS modules) - Those cases arise when for u or v, some control points - for a fixed value of that parameter form the same point. - Imagine a Bezier patch degenerated into a "triangle". - - v ^ 0,1,2 order=3 - | * - | - | 3* 4* 5* - | - | 6* 7* 8* - | - | - +------------------------> u - - The calculus of du derivative at triple point (0,1 and 2) will fail. - As a result, the normal vector will be 0. - The eval2.c code has to be changed to handle the above situation. - -2) Adjacent NURBS surfaces ("sharing" the same control points along - the "joining" edge) will be sampled with the same factor. - This prevents the formation of "cracks". - When the control polygon of the "shared" edge is not the same, - cracks might appear. - -The sampling tolerance is sometimes not respected! -A NURBS object is broken into Bezier curves/surfaces. If one of such -Bezier objects has a local high curvature with other portions of it -relatively flat then the high curvature part will be sampled more dense that -its flatter regions. -The flat regions might be tesselated into quads having sides of length -greater than the current sampling tolernace setting. -I believe such behaviour is acceptable, though not along the concept of -sampling tolerance. - -February 20, 1996. - -Bogdan. -- cgit v1.2.3