Creative Commons, 2d game sprites.

[Boston]

Hi 0AD community,

I'm Boston.

I am working on a 2d open source game and I've heard that graphics in 0AD are under a creative commons license.

https://bbrooks193.blogspot.com/2021/12/maths-game.html

Could someone post a list of steps involved in downloading unit graphics and converting them to 2d sprites?

Kind regards,

Boston.

[wowgetoffyourcellphone]

This would be difficult, but not impossible. I imagine you'd have to download all of the assets, import them into Blender, then render them all in 2D, including the unit key frames to animate them. 

[alre]

or maybe just put them down in atlas and take captions? idk if that's better.

*atlas is the in-game editor

[wowgetoffyourcellphone]

  On 22/11/2023 at 7:39 PM, alre said:

or maybe just put them down in atlas and take captions? idk if that's better.

*atlas is the in-game editor

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Unfortunately, the camera in Atlas is not isometric/orthogonal. 

[Boston]

That's unfortunate.

Do you think I could muck around and export 2d images from the sources? I only need 1 or 2 units for the time being. How can I download the sources as per the Creative Commons license?

Kind regards,

Boston.

[Boston]

I have modified Atlas to work in isometric.

I replaced line 233 of /source/tools/atlas/GameInterface/View.cpp

original:     camera.SetProjectionFromCamera(*g_Game->GetView()->GetCamera());

new:          camera.SetPerspectiveProjection(1, 512, 0.1);

It can be done!

More work is needed to export the 2d images.

[Boston]

I got it to work again today, but I had to do a similar change to the code, this time in /source/tools/atlas/GameInterface/ActorViewer.cpp, on line 532.

I made a mock-up of the tool that I would like to build:

Unfortunately, I'm not so good on C++

What do you think?

Boston.

[wowgetoffyourcellphone]

Nice mockup. Looks like you've thought it through. 

[Boston]

Here is a better demonstration of having a 3d asset rendered as a 2d sprite.

 

 

I'm off to learn the wxWidgets API and the Coding Conventions.

 

Boston

[alre]

  On 17/12/2023 at 7:09 AM, Boston said:

Here is a better demonstration of having a 3d asset rendered as a 2d sprite.

 

 

I'm off to learn the wxWidgets API and the Coding Conventions.

 

Boston

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very cool. honestly, I didn't think about animations when I suggested atlas.

[Boston]

I added a button to the Actor Viewer

I might fix the problem with having to zoom in and out after toggling the 3d look, later.

Boston.

[wowgetoffyourcellphone]

  On 21/12/2023 at 2:46 AM, Boston said:

I added a button to the Actor Viewer

I might fix the problem with having to zoom in and out after toggling the 3d look, later.

Boston.

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Nice. Are you achieving this by changing the zoom and narrowing the field of view? 

 

[Boston]

Ah cool.

Yes, that's exactly what I'm doing. 

I'm thinking about rolling my own app that uses a true orthogonal camera with various export settings, but I'll see if I can do this simple change and get it added to the game first 

Boston.

[wowgetoffyourcellphone]

  On 21/12/2023 at 6:27 AM, Boston said:

true orthogonal camera with various export settings

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That would be awesome. It's been a desired feature for the game as well, ever since there was a big positive reaction to my "Isometric" videos.

[Boston]

It would be hard to add an isometric camera to 0 A.D. because sometimes you would want the isometric camera and other times (such as during cutscenes) you'd want the perspective camera.

[wowgetoffyourcellphone]

  On 23/12/2023 at 12:17 AM, Boston said:

It would be hard to add an isometric camera to 0 A.D. because sometimes you would want the isometric camera and other times (such as during cutscenes) you'd want the perspective camera.

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I think with an isometric mode, you could have AOE2-esque cutscenes.

[Boston]

You could put in a trigger that converts between perspective when needed and preffered mode during game play

[vladislavbelov]

  On 21/12/2023 at 8:01 AM, wowgetoffyourcellphone said:

That would be awesome. It's been a desired feature for the game as well, ever since there was a big positive reaction to my "Isometric" videos.

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We have a ticket for that: https://trac.wildfiregames.com/ticket/3653. I believe it's doable, it just needs a pair of free C++ hands.

  On 23/12/2023 at 12:17 AM, Boston said:

It would be hard to add an isometric camera to 0 A.D. because sometimes you would want the isometric camera and other times (such as during cutscenes) you'd want the perspective camera.

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It's not really a problem for our engine. We can automatically switch them for cutscenes.

  On 14/12/2023 at 8:12 AM, Boston said:

new:          camera.SetPerspectiveProjection(1, 512, 0.1);

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We have a separate method to set an ortho projection (a classic isometric view is a special case of an orthographic projection).

[Boston]

  On 23/12/2023 at 12:35 PM, vladislavbelov said:

We have a separate method to set an ortho projection (a classic isometric view is a special case of an orthographic projection).

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I've seen that. I do plan on using it in future, but setting a narrow field of view meant making less changes to the code.

I have a question. If I do use this to create a bunch of 2d animations, how do I distribute them under the terms of the creative commons licence? 

Edited December 24, 2023 by Boston

[Stan`]

  On 24/12/2023 at 12:18 AM, Boston said:

I have a question. If I do use this to create a bunch of 2d animations, how do I distribute them under the terms of the creative commons licence? 

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I suppose they fall in the "derivative works" category so they would be CC BY SA 3.0 as long as you give credit to wildfiregames it should be fine