ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Mon, 16 Sep 2019 22:36:53 +0200Intersection of implicitely defined surfaceshttps://ask.sagemath.org/question/47944/intersection-of-implicitely-defined-surfaces/ Is there a general way to visualize the space curve defined by the intersection of 2 implicitely defined surfaces?
I know, this has been discussed here before with the following suggested solutions:
1. Visualize all equations in the same plot - this has the disadvantage that surfaces - even if opaque, distract attention and may obstruct the view on the intersection curves
2. Combine the defining equations into a system of euations and solve it, present the solutions as parametric plots - this doesn't work with complex surfaces where Sage cannot solve the system.
I know, some 3D objects have an intersection() method, but apparently not those generated by implicit_plot3d.
But maybe, someone has another solution?
IngoMon, 16 Sep 2019 22:36:53 +0200https://ask.sagemath.org/question/47944/different color on backside of surfacehttps://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 17:38:03 +0200https://ask.sagemath.org/question/10290/