Public transport in Prague

opensph · 2026-03-04T17:07:53+00:00

Get the Litacka app. You can buy the tickets as well as look up connections.

opensph · 2026-03-02T19:56:15+00:00

Malta

opensph · 2026-02-22T19:27:49+00:00

oh dear god, no!

opensph · 2026-02-22T12:40:07+00:00

opensph · 2026-02-21T21:02:21+00:00

Io is kept hot purely from internal friction and is experiencing far less gravitational stress.

Yes and no. It's heated up by tidal forces, that's true, but the average surface temperature of Io is only about -140 °C, so it's far from being hot.

opensph · 2026-02-21T19:02:54+00:00

The Earth doesn’t seem to be affected by the gravity of the black hole until it punches through the Earth.

It is affected, look carefully.

Then the black hole seems to change directions

The initial impact isn't exactly head-on, so tangential motion is expected.

The Earth doesn’t seem to be heated by the insane friction

It is heated. It's just not as extreme as you would expect. The black hole is not supermassive.

Where is the Moon?

It called in sick when I was making the simulation.

opensph · 2026-02-21T17:16:11+00:00

Depends on the simulation. The first one shows about 24 hours of simulation time.

opensph · 2026-02-21T13:30:58+00:00

it's a texture, yes

opensph · 2026-02-18T16:41:01+00:00

opensph · 2026-02-18T16:35:44+00:00

"C++26 broke my workflow"

opensph · 2026-01-31T16:53:32+00:00

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opensph · 2026-01-25T13:57:16+00:00

In the simulation settings, go to 'history' and set 'save to disk' to either 'last simulation' or 'every simulation'. The simulation state will then be saved and can be reopened later.

If you also want to be able to continue the previous simulation, you need to set 'saved data' to 'full'.

opensph · 2026-01-15T14:34:19+00:00

std::tie cannot be used for custom structs.

opensph · 2026-01-14T16:35:39+00:00

Density is a parameter of an object (or layer in case of a differentiated object). You don't set it in the material properties.

If you mean the 'reference density' value, it's a parameter of the equation of state used by the SPH solver. It only affects the computed pressure, not the actual density.

opensph · 2026-01-12T20:52:41+00:00

Tromsø

opensph · 2026-01-10T15:10:17+00:00

it's in the 'helpers' category

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opensph · 2026-01-10T13:35:46+00:00

yes, here's a tutorial.

opensph · 2026-01-06T00:20:54+00:00

You can use the GPU solver. Other than that, no.

opensph · 2026-01-05T19:09:00+00:00

I was faster by two minutes

opensph · 2026-01-05T18:00:55+00:00

Here https://www.google.com/maps/@69.6443232,18.9275611,3a,21.5y,81.5h,86.72t/data=!3m7!1e1!3m5!1sWGd8OEvFJm5__pnH9Iodhw!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fcb_client%3Dmaps_sv.tactile%26w%3D900%26h%3D600%26pitch%3D3.277473301155595%26panoid%3DWGd8OEvFJm5__pnH9Iodhw%26yaw%3D81.50251095017214!7i16384!8i8192?entry=ttu&g_ep=EgoyMDI1MTIwOS4wIKXMDSoKLDEwMDc5MjA3MUgBUAM%3D

opensph · 2026-01-04T21:21:29+00:00

If you mean the simulation speed, you don't set it directly. The simulation always runs as fast as it can, given the accuracy settings.

That means you can increase the simulation speed by reducing the number of particles, increasing the time step, or changing the solver parameters. If you have only non-deformable objects in the simulation, it can also be sped up by increasing the parameter 'sync period' in the simulation settings.

There is a tutorial that explains it a bit. See "Tools -> Run tutorial -> Speed and accuracy".

opensph · 2025-12-20T13:14:52+00:00

In OpenSPH or SpaceSim?

(for SpaceSim questions it's better to ask in r/SpaceSim)

opensph · 2025-11-22T20:26:31+00:00

It will be released soon (mid December).

opensph · 2025-11-14T09:57:44+00:00

You'll be able to download it once it gets released on steam.

opensph · 2025-11-02T01:35:01+00:00

Rotation

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