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  • Spine in Z axis - XNA

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I have read samething about Z axis in Unity, but I use XNA (FNA) runtime...
is it possibile to use Spine skeleton in Z axis?
so instead of parallax I would like to be able to use the z axis
I hope I explained myself
regards
Cristian Zerbinati

You can set to Z component of your skeleton translations via the world matrix: effect.World = yourRotationTranslationScaleMatrix;
Then as the second part, you need the camera projection matrix to not be orthogonal, but perspective. You can set this via

effect.Projection = Matrix.CreatePerspectiveFieldOfView(..);

Documentation can be found here, a thirdparty forum thread found here (just don't set the near and far planes that far apart, the far plane could be at e.g. 100 units distance to not waste precision unnecessarily).

Thank you Harald,
I do tests and I see what will be better to choose for my project 🙂
By any chance do you know if someone has already done a test with Spine and perspective camera? in your opinion it would make sense, or there are contraindications?
bye
Cristian Zerbinati

It would be perfectly valid to use a perspective camera, I see no problems with this!

Just be sure to reserve some time for getting it right, and be sure to first set the near plane rather close (e.g. 0.1) and check that all your skeletons .World translation matrices are placing the Skeleton in front of your camera according to the .View matrix. Here the camera is located at Z = 1 and looks along the negative Z axis:

effect.View = Matrix.CreateLookAt(new Vector3(0.0f, 0.0f, 1.0f), Vector3.Zero, Vector3.Up);

So any Skeleton located at Z = 0 or Z = -20 will be in front of the camera (and also in front of the near plane) and will therefore be visible. If the Skeleton were at Z = 1 it would not be visible (that's the camera eye position, behind the near plane).

8 meses depois

After write code and rewrite part of spine runtime, now I'm eable to use spine in 3D space 8)
Our target is to create a product ar least as Ori and the blind forest.
The downside is that I have to rewrite a ton of code of our engine, already done for OrthographicCamera :tmi:
https://screencast-o-matic.com/watch/cYXDXiLcXv

eprime escreveu

After write code and rewrite part of spine runtime, now I'm eable to use spine in 3D space

Great to hear! Was the normal use of the effect.World matrix not sufficient for your tasks (as pointed out in my first task)? I'm just curious why a rewrite was necessary for you here, just offsetting an object in Z direction is normally done via the object's world matrix (elsewhere called model matrix).

Harald escreveu
eprime escreveu

After write code and rewrite part of spine runtime, now I'm eable to use spine in 3D space

Great to hear! Was the normal use of the effect.World matrix not sufficient for your tasks (as pointed out in my first task)? I'm just curious why a rewrite was necessary for you here, just offsetting an object in Z direction is normally done via the object's world matrix (elsewhere called model matrix).

I have only add the proprity Z position to skeleton and add it to the SkeletonRender on the Draw funtion 🙂
now I can set z for every single Skeleton.
"rewrite" it's too big a term, I should have added a few lines of code :nod:
now I must find appropriate settings of the camera for render spine model without scale too much.
Our target is to create an engine editor for create a videogame like Ori and the blind forest, and for now it's going great

could you add the code in github too? they are few rows
with this anyone who wants use perspective camera can do it

in Skeleton.cs
row 48
internal float x, y, z; //add z float
...
after Y row 65
public float Z { get { return z; } set { z = value; } }

in SkeletonRenderer.cs
row 214
itemVertices[ii].Position.Z = attachmentZOffset + skeleton.Z;//add Z

the only thing to do if use a perspective camera is to flip Y skeleton bone, in orthographic instead are correct

eprime escreveu

"rewrite" it's too big a term, I should have added a few lines of code

Ok 🙂.

eprime escreveu

Would you add the code in github too? they are few rows
with this anyone who wants use perspective camera can do it

I think we will add a Z value for consistency. We will let you know once it's in.

eprime escreveu

the only thing to do if use a perspective camera is to flip Y skeleton bone, in orthographic instead are correct

Please note that if you only changed the projection matrix and suddenly the Y axis is inverted, then most likely your perspective projection matrix has been setup incorrectly, or the previous orthographic projection matrix was wrong.

Harald escreveu

could you add the code in github too? they are few rows
with this anyone who wants use perspective camera can do it

in Skeleton.cs
row 48
internal float x, y, z; //add z float
...
after Y row 65
public float Z { get { return z; } set { z = value; } }

in SkeletonRenderer.cs
row 214
itemVertices[ii].Position.Z = attachmentZOffset + skeleton.Z;//add Z

At first sight I missed that you were talking about adding a z value to the Skeleton.cs class of the spine-csharp core runtime, at first glance I thought it was about adding the value to the xna-specific SkeletonRenderer. Unfortunately we cannot add this value, as it will affect all runtimes based on spine-csharp, including spine-unity.

I have just added a Z property to the SkeletonRenderer instead, which will have the same effect.

For reference: the modification can be found in this commit:
https://github.com/EsotericSoftware/spine-runtimes/commit/968a7b5777d16ff41ede42946f101e12efed6e07

ok! thank you 🙂

You're welcome. 🙂