tachyon not found (SageMath 9.5, running on an Intel-based Mac)

[harald....@gmail.com]

Hi,

I am running SageMath 9.5 (compiled from source on an Intel-based Mac). I haven't been having trouble, but today I was toying with 3D plotting, and, when I tried to do an animation, I got an error message telling me that tachyon could not be found. (I have not used tachyon before. Non-animated 3D plots work fine).

The following example from the documentation

-----

S = sphere(opacity=0.8, aspect_ratio=[1,1,1])
L = line3d([(0,0,0),(2,0,0)], thickness=10, color='red')
M = S + S.translate((2,0,0)) + L
M.show(viewer='tachyon')

-----

gives an error message:

....

FileNotFoundError: [Errno 2] No such file or directory: 'tachyon'

What to do?

Best

Harald

[Dima Pasechnik]

Please post the top level config.log.

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[harald....@gmail.com]

Here it is.

[Dima Pasechnik]

OK, so tachyon comes from Conda... Can you check that tachyon is in
Sage's PATH, i.e.
run the following two commands:

./sage -sh
which tachyon

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[harald....@gmail.com]

Right, "which tachyon" gives an empty output. What to do?

[Dima Pasechnik]

and if you run

which tachyon

outside of "sage -sh" subshell, is it seen?

If not, it might be about activated vs non-activated Conda. 

If you built Sage under Conda, you'd need to run it under Conda, too.

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[harald....@gmail.com]

No, it is not seen. I do have conda. I don't *think* I built this version of Sage under it, but I am not positive.

[Dima Pasechnik]

You have built Sage with a lot of Conda packages, as can be seen from your config.log.

Not sure you had Conda activated, but you had its binary directories in PATH,

in particular tachyon was found there.

Now tachyon is no longer in PATH. One way to remedy this would be to activate Conda and then start Sage.

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[harald....@gmail.com]

... or add it to the PATH, I suppose. But how do I find it now?

[Dima Pasechnik]

On Mon, 9 May 2022, 11:49 harald....@gmail.com, <harald....@gmail.com> wrote:

... or add it to the PATH, I suppose. But how do I find it now?

searching config.log for tachyon gives

/Users/harald/miniconda3/envs/sage-build/bin/tachyon

Indeed, searching for PATH there will tell you that 

Users/harald/miniconda3/envs/sage-build/bin

was in your PATH while you built Sage.

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[Isuru Fernando]

conda activate sage-build  should do the trick.

Isuru

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[harald....@gmail.com]

conda activate sage-build  works nicely. Thanks!