Very slow graphics rendering

*To*: mathgroup at smc.vnet.net*Subject*: [mg14137] Very slow graphics rendering*From*: "julio vera" <lvera at varela.reu.edu.uy>*Date*: Mon, 28 Sep 1998 03:51:49 -0400*Sender*: owner-wri-mathgroup at wolfram.com

Hello. Thanks to Sergio Terrazas and Will Self for the very useful answers I received to my previous question. With their help, I could make a graphic of part of a 3D object, like this piece of a sphere: ParametricPlot3D [{x , y , If[ x^2 + y^2 < (4/5)^2 , Sqrt [ 1 - x^2 - y^2 ] ] } , {x , -1 , 1 , 1/75} , { y, -1 , 1 , 1/75} ] With an increment bigger than 1/75, the limits of the plot are quite irregular. My question is if I can achieve a definite curve limit for a partial 3D object in a more efficient way, since for each graphic I have to wait more than an hour. I work with 16 mega RAM and a 686 Cyrix motherboard. Another aspect: the graphics get rather dark, because of the amount of lines that are drawn. After the picture is finished, I can eliminate the black in them by using preferences on the graphic object, with the right button of the mouse. Maybe these 2 problems are related, since the delay may be happening because of all the division lines that are drawn. Thanks in advance, Julio Vera