/usr/lib/python2.7/dist-packages/sagenb/data/sage3d/README.txt is in python-sagenb 1.0.1+ds1-2.
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1 2 3 4 5 6 7 8 9 10 | The sage3d ('java3d') viewer requires third-party libraries. To use the viewer:
* Download a build from https://java3d.dev.java.net/
* Install in $SAGE_LOCAL/lib/python/site-packages/sagenb/data/sage3d/lib
* Edit $SAGE_LOCAL/bin/sage3d
* sage: var('A,B,C')
sage: implicit_plot3d(sin(A)*cos(B) + sin(B)*cos(C) + sin(C)*cos(A), (A,-2*pi,2*pi), (B,-2*pi,2*pi), (C,-2*pi,2*pi), viewer='java3d')
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