ASKSAGE: Sage Q&A Forum - Latest question feedhttp://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Wed, 01 Oct 2014 18:53:42 -0500The boundary of an implicit_plot3d are jittery.http://ask.sagemath.org/question/24370/the-boundary-of-an-implicit_plot3d-are-jittery/ I am making a contour plot in a restricted region using the following commands:
var('x,y,z')
implicit_plot3d((x^2+y^2-.4)*(x^2+z^2-.4)*(z^2+y^2-.4)*(x^2+(y-z)^2/2-.4)*(z^2+(x-y)^2/2-.4)*(y^2+(x-z)^2/2-.4)*(x^2+(y+z)^2/2-.4)*(z^2+(x+y)^2/2-.4)*(y^2+(x+z)^2/2-.4)==1, (x, -3, 3), (y, -3,3), (z, -3,3), color='green', plot_points=100, region=lambda x,y,z: x^2+y^2+z^2<10)
The surface is restricted to a ball, using the region command. This is because I need to illustrate a surface with its boundary meeting the corresponding sphere.
My problem is that some of the boundary cylinders have their border very jittery. They look like a saw. I need them to be smooth, as some others actually are.
I tried using Adaptative=true, without any success. The same problem also applies when I use tachyon to render rather than jmol.
Any suggestions would be welcome.
Thank you
alexgWed, 01 Oct 2014 18:53:42 -0500http://ask.sagemath.org/question/24370/different color on backside of surfacehttp://ask.sagemath.org/question/10290/different-color-on-backside-of-surface/Hey,
I want to animate a 3D plot. Therefore I generate tachyon rendered implicit plots which I then send to ffmpeg. This works quite well. The only disadvantege, is that it's during the video hard to distinguish which side of the surface one sees. Therefore I want to change the color of the backside or at least increase the shadow.
I already tried some stuff with the tachyon raytracer building a scene. But this does not work for implicit plots. The solution given [here](http://ask.sagemath.org/question/20/the-tachyon-object-used-for-rendering-plots) seems not to be very usefull in this context.
Is there perhaps a simply trick, which does the job?
ThorstenWed, 26 Jun 2013 10:38:03 -0500http://ask.sagemath.org/question/10290/