Wolfram Mathematica

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12:57 AM

@Dr.belisarius John Carmack just tweeted a question you answered.

I am very thankful that I can just google things like this: http://math.stackexchange.com/questions/36398/point-closest-to-a-set-four-of-lines-in-3d

Tweeted by ID_AA_Carmack on March 12, 2016 at 11:29 PM

Michael E2

@MarcoB Thanks. I'll vote when it gets up to 3. It's remarkably hard to help the OP in any questions because of the version difference. And I usually feel like the response to every suggestion is, "I can't figure it out. Show me how." And if you do, it's, "It doesn't work," and you have no idea why.

MarcoB

1:31 AM

@MichaelE2 True! I have also been trying to follow the raging comment discussion about depth sorting in MMA in one of Cham's other recent questions (109742), which perfectly exemplifies his peculiarly combative and adversarial way of accepting help... Oh well.

J. M.

1:47 AM

@Dr.belisarius Same as you are. ;)

2 hours later…

Meta

3:24 AM

Q: Why is my question about Solve[] "off-topic"?

Why is my question closed as off-topic? I gave an example for it as requested in the comments, I'm not sure what makes it "off-topic".

discussion

1 hour later…

kirma

4:40 AM

Another object heading for 3D printing (mainly to try out how such a shape succeeds).

4 hours later…

J. M.

8:35 AM

@kirma These are not Tube[]s, right? That's a very nice net of the Richmond surface.

kirma

@J.M. No, they're rectangular and oriented according to the parametric derivatives of the surface. See the straight lines at z-plane going towards the origin... those actually turn by 90 degrees on the way.

J. M.

@kirma Thought so. More effort to make, but makes the result nicer-looking. :)

kirma

@J.M. Yeah, it took a bit of effort, but really the only problem was the fear 3D shop might not like the resulting polygon mesh. It worked, though.

J. M.

I guess it's gonna be harder to do that operation for my Wente torus; the parametric equations are already sufficiently complicated, and the derivatives more so.

kirma

Hmmh, AlphaGo resigned on fourth game to Lee Sedol...

@J.M. Well, maybe one could go numerically in that case... (?)

J. M.

8:51 AM

@kirma I guess I can try that. Just imagining the length of the resulting code is making me turn a bit green tho. :D

kirma

4 hours later…

kirma

1:25 PM

Accidentally artsy...

m0nhawk

1:43 PM

Looks like Voronoi diagrams.

Szabolcs

@kirma Sunflower?

kirma

@Szabolcs Sort of... Fermat's spiral based Voronoi diagram and four-coloring. I was expecting sunflowery looks, but maybe it has some extra effects. :)

J. M.

2:06 PM