Surface is smudged when two parameteric lines intersect on surface

*To*: mathgroup at smc.vnet.net*Subject*: [mg39989] Surface is smudged when two parameteric lines intersect on surface*From*: "Narasimham G.L." <google.news.invalid at web2news.net>*Date*: Fri, 14 Mar 2003 04:45:14 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

When two intersecting lines are drawn (or when three or more lines concur at/near a point) on a surface, the depicted surface becomes smudged and shabby in appearance. Perhaps it is due to the conflict resolution of differential patch occupation by trying to accomodate both, however appears to do inadequate justice to either, partial overlaps seem inevitable and lines are jagged. It is not known how the graphics algorithms are made, but looking at what one sees, perhaps it may be better to give the first appearance a normal patch depiction and ignore the procedures for patching up the patch on subsequent passes of the line on the surface.This option will not only give clean surfaces, but also show clearer later drawn lines more continuously. Is there a ' see through ' option like in another system? Best Regards, Narasimham G.L. Indian Space Research Orgn 695013 --- R=4 ; a=2 ; 'WRAPED RING >> circles radius R wrapped on cylinder surface radius a ; u {u,0,Pi} is OK but (u,0,2Pi) smudges when two or more concurrent lines are attempted to be drawn on a surface ' ParametricPlot3D[{a Cos[R Sin[u]/a+al], a Sin[R Sin[u]/a +al], R Cos[u]} ,{u,0,Pi},{al,0,2Pi}, ViewPoint->{2,0,1},PlotPoints->{20,20}]; --- -- Posted via http://web2news.com To contact in private, remove