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]

23 hours ago, alre said:

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

*atlas is the in-game editor

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]

2 hours ago, 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

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]

1 hour ago, 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.

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]

1 hour ago, Boston said:

true orthogonal camera with various export settings

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]

8 minutes ago, 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.

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 9:01 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.

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.

12 hours ago, 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.

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

On 14/12/2023 at 9:12 AM, Boston said:

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

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

[Boston]

11 hours ago, vladislavbelov said:

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

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`]

14 hours ago, 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? 

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