### Re: Atrium - 3D game written in D

```
07.11.2015 21:17, Manuel König пишет:

Am Fri, 6 Nov 2015 12:04:03 +0300
schrieb Timur Gafarov :

Atrium (code name) is a work-in-progress science fiction game with
physics based puzzles (gravity effects, force fields, etc) akin to
Portal or Inverto. The game is fully written in D, it uses custom
graphics engine based on OpenGL and SDL. Physics engine is also
written from scratch.

Source code:
https://github.com/gecko0307/atrium

IndieDB page:
http://www.indiedb.com/games/atrium

A precompiled demo for Windows:
https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

This looks very nice, congrats! I'm especially interested in the physics
and character controller part, because I'm currently developing a
character controller myself, but just a sphere character in a static
triangle world for now.

Finding a robust and fast sliding algorithm for sliding a sphere along
triangles in a given direction seems to be the hardest part. I'm
investigating two approaches, which can be simplified to:

1) move until we hit any geometry, compute new slide direction, repeat
2) move first, then project the character out of the world geometry

Both approaches work reasonably well, but there are scenarios where
they don't work so well (mostly pathetic scenarios). I'll
definitely look how you solved the problem and maybe tinker with your
physics code :)

I took rather idiomatic approach: move, detect collisions, generate
contact points, then solve them iteratively. Sliding is obtained
somewhat automatically.

```

### Re: Atrium - 3D game written in D

```Am Fri, 6 Nov 2015 12:04:03 +0300
schrieb Timur Gafarov :

> Atrium (code name) is a work-in-progress science fiction game with
> physics based puzzles (gravity effects, force fields, etc) akin to
> Portal or Inverto. The game is fully written in D, it uses custom
> graphics engine based on OpenGL and SDL. Physics engine is also
> written from scratch.
>
> Source code:
> https://github.com/gecko0307/atrium
>
> IndieDB page:
> http://www.indiedb.com/games/atrium
>
> A precompiled demo for Windows:
> https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

This looks very nice, congrats! I'm especially interested in the physics
and character controller part, because I'm currently developing a
character controller myself, but just a sphere character in a static
triangle world for now.

Finding a robust and fast sliding algorithm for sliding a sphere along
triangles in a given direction seems to be the hardest part. I'm
investigating two approaches, which can be simplified to:

1) move until we hit any geometry, compute new slide direction, repeat
2) move first, then project the character out of the world geometry

Both approaches work reasonably well, but there are scenarios where
they don't work so well (mostly pathetic scenarios). I'll
definitely look how you solved the problem and maybe tinker with your
physics code :)

```

### Re: Atrium - 3D game written in D

```
Would be nice to have demos avaliable on github

```

### Re: Atrium - 3D game written in D

```
On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov wrote:
Atrium (code name) is a work-in-progress science fiction game
with physics based puzzles (gravity effects, force fields, etc)
akin to Portal or Inverto. The game is fully written in D, it
uses custom graphics engine based on OpenGL and SDL. Physics
engine is also written from scratch.

Source code:
https://github.com/gecko0307/atrium

IndieDB page:
http://www.indiedb.com/games/atrium

A precompiled demo for Windows:
https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

It looks good and the physics simulation seems to work really
well, congratulations.

```

### Re: Atrium - 3D game written in D

```
On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov wrote:
Atrium (code name) is a work-in-progress science fiction game
with physics based puzzles (gravity effects, force fields, etc)
akin to Portal or Inverto. The game is fully written in D, it
uses custom graphics engine based on OpenGL and SDL. Physics
engine is also written from scratch.

Source code:
https://github.com/gecko0307/atrium

IndieDB page:
http://www.indiedb.com/games/atrium

A precompiled demo for Windows:
https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

Nice, graphics and physics look impressive in the demo video.  If
you ever want to try and get it on Android, let me know if I can
help.  I'll have a build of the ldc cross-compiler up for

```

### Re: Atrium - 3D game written in D

```
On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov wrote:
Atrium (code name) is a work-in-progress science fiction game
with physics based puzzles (gravity effects, force fields, etc)
akin to Portal or Inverto. The game is fully written in D, it
uses custom graphics engine based on OpenGL and SDL. Physics
engine is also written from scratch.

Source code:
https://github.com/gecko0307/atrium

IndieDB page:
http://www.indiedb.com/games/atrium

A precompiled demo for Windows:
https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

Great looking game, nice work. Are there any plans to distribute
the GUI/Gfx and physics components as separate libraries?

Stew

```

### Re: Atrium - 3D game written in D

```
On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov wrote:
Atrium (code name) is a work-in-progress science fiction game
with physics based puzzles (gravity effects, force fields, etc)
akin to Portal or Inverto. The game is fully written in D, it
uses custom graphics engine based on OpenGL and SDL. Physics
engine is also written from scratch.

Source code:
https://github.com/gecko0307/atrium

IndieDB page:
http://www.indiedb.com/games/atrium

A precompiled demo for Windows:
https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

Really glad to see improvements. Definitely will wait for the
release to play.

Did not know about Inverto, should check it out too.

```

### Re: Atrium - 3D game written in D

```
06.11.2015 12:29, stewart пишет:

On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov wrote:

Atrium (code name) is a work-in-progress science fiction game with
physics based puzzles (gravity effects, force fields, etc) akin to
Portal or Inverto. The game is fully written in D, it uses custom
graphics engine based on OpenGL and SDL. Physics engine is also
written from scratch.

Source code:
https://github.com/gecko0307/atrium

IndieDB page:
http://www.indiedb.com/games/atrium

A precompiled demo for Windows:
https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

Great looking game, nice work. Are there any plans to distribute the
GUI/Gfx and physics components as separate libraries?

Stew

They already exist as separate libs:
https://github.com/gecko0307/dmech
https://github.com/gecko0307/dgl

DGL (graphics engine) is currently falling behind from the game and may
contain bugs, but I eventually update it.

```

### Re: Atrium - 3D game written in D

```
On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov wrote:
Atrium (code name) is a work-in-progress science fiction game
with physics based puzzles (gravity effects, force fields, etc)
akin to Portal or Inverto. The game is fully written in D, it
uses custom graphics engine based on OpenGL and SDL. Physics
engine is also written from scratch.

Source code:
https://github.com/gecko0307/atrium

IndieDB page:
http://www.indiedb.com/games/atrium

A precompiled demo for Windows:
https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

Any demo for linux too?

```

### Re: Atrium - 3D game written in D

```
On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov wrote:
Atrium (code name) is a work-in-progress science fiction game
with physics based puzzles (gravity effects, force fields, etc)
akin to Portal or Inverto. The game is fully written in D, it
uses custom graphics engine based on OpenGL and SDL. Physics
engine is also written from scratch.

Source code:
https://github.com/gecko0307/atrium

IndieDB page:
http://www.indiedb.com/games/atrium

A precompiled demo for Windows:
https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

Very cool!
How have it been to work with the GC?
Reddit it! Maybe with an writeup?

```

### Re: Atrium - 3D game written in D

```
06.11.2015 13:51, Andrea Fontana пишет:

On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov wrote:

Atrium (code name) is a work-in-progress science fiction game with
physics based puzzles (gravity effects, force fields, etc) akin to
Portal or Inverto. The game is fully written in D, it uses custom
graphics engine based on OpenGL and SDL. Physics engine is also
written from scratch.

Source code:
https://github.com/gecko0307/atrium

IndieDB page:
http://www.indiedb.com/games/atrium

A precompiled demo for Windows:
https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

Any demo for linux too?

Linux demo will be available very soon.

```

### Re: Atrium - 3D game written in D

```
06.11.2015 13:51, NVolcz пишет:

On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov wrote:

Atrium (code name) is a work-in-progress science fiction game with
physics based puzzles (gravity effects, force fields, etc) akin to
Portal or Inverto. The game is fully written in D, it uses custom
graphics engine based on OpenGL and SDL. Physics engine is also
written from scratch.

Source code:
https://github.com/gecko0307/atrium

IndieDB page:
http://www.indiedb.com/games/atrium

A precompiled demo for Windows:
https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

Very cool!
How have it been to work with the GC?
Reddit it! Maybe with an writeup?

I tried to fully avoid GC, using my own malloc-based allocator. This
lead to the fact that the code is not very D-ish, but it proves that
there's perfectly possible to write real-world GC-free applications in D.

```

### Re: Atrium - 3D game written in D

```
On Friday, 6 November 2015 at 10:58:24 UTC, Timur Gafarov wrote:

06.11.2015 13:51, NVolcz пишет:
On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov
wrote:

[...]

Very cool!
How have it been to work with the GC?
Reddit it! Maybe with an writeup?

I tried to fully avoid GC, using my own malloc-based allocator.
This lead to the fact that the code is not very D-ish, but it
proves that there's perfectly possible to write real-world
GC-free applications in D.

On Friday, 6 November 2015 at 10:58:24 UTC, Timur Gafarov wrote:

Kickstarter awaits! Glad to see you here.

```