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# A way to rotate a tachyon plot

I can rotate a plot3d using the Java viewer, and then take an image. I'd like to use tachyon, but then how do I choose the right angle to take the picture?

I'd like to rotate the whole plot, or in other words, "place the camera in an arbitrary position"?

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## 3 Answers

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Does the .rotate() method do what you want? Compare the output of:

sage: var('x,y')
(x, y)
sage: P = plot3d(sin(x*y), (x,-2,2), (y,-2,2))
sage: Q = P.rotate((0,0,1),pi/4)
sage: P.show(viewer='tachyon')
sage: Q.show(viewer='tachyon')

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## Comments

I can't believe I didn't see that one! I'll edit the question so that it's less confusing... but it wasn't a waste: I'll use the Tachyon stuff anyway.

( 2011-06-02 07:57:25 +0200 )edit

While this isn't my thread, I'd like to thank the poster: this totally answers a question I was wondering about.

( 2011-08-13 21:57:01 +0200 )edit

Another option is the sage.plot.plot3d.tachyon.Tachyon interface (which is imported into the global namespace by default). Basically, you create a Tachyon scene instance, setup the contents of the scene, then render. Here is a slightly modified example from the Tachyon docstring:

sage: t = Tachyon(xres=512,yres=512, camera_center=(3,0.3,0), look_at=(0,0,0), updir=(0,0,1))
sage: t.light((4,3,2), 0.2, (1,1,1))
sage: t.texture('t0', ambient=0.1, diffuse=0.9, specular=0.5, opacity=1.0, color=(1.0,0,0))
sage: t.texture('t1', ambient=0.1, diffuse=0.9, specular=0.3, opacity=1.0, color=(0,1.0,0))
sage: t.texture('t2', ambient=0.2,diffuse=0.7, specular=0.5, opacity=0.7, color=(0,0,1.0))
sage: k=0
sage: for i in srange(-1,1,0.05):
...    k += 1
...    t.sphere((i,i^2-0.5,i^3), 0.1, 't%s'%(k%3))
...
sage: t.show()


The key here is the first line--the arguments camera_center, look_at, and updir, which are quite self-explanatory.

The only problem with this mechanism is that you must directly use Tachyon's methods to construct objects instead of Sage's usual plotting interfaces. (Graphics3d, plot3d, parametric_plot3d, etc.)

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## Comments

That didn't work for me because I had several implicit_plot_3d. I was able to use a trick from http://ask.sagemath.org/question/20/the-tachyon-object-used-for-rendering-plots, but it was very verbose and a bit hacky. Thanks anyway, this might work for somebody else.

( 2011-06-07 06:57:28 +0200 )edit

Unfortunately the rotate() method didn't work for my implicit_plot3d plot. It seems a bit strange. Why not making the additional options such as camera_center available via the show() method? There are some "extra_opts" parameter in show() method, but it is not clear how to use it and whether it is actually possible to pass the camera_center parameter through it.

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Asked: 2011-06-02 07:00:12 +0200

Seen: 1,735 times

Last updated: Aug 13 '11