Rotation Support

[JeroenoBoy]

For the game I am making, I need sprites to be able to rotate.

Could this feature be added to the library?

[Antoshidza]

Yes, it can be implemented, but it should be a part of Transform2D and have all stuff like parent -> child rotation computations OR foundation should refuse to use 2D and instead use all 3D Unity.Transform components and instead of constructing matrix in shader just pass it in. So I need to think what is a better way.

If you want it right here and now, then you can implement it by yourself. There are 3 possible ways I can imagine of how it can be done. (as a shader reference I will use https://github.com/Antoshidza/NSprites-Foundation/blob/main/Graphics/Regular%20Render/RegularNSprites_Shader.shader)

• Sending rotation float4 struct to StructuredBuffer<float4> in your shader and then in setup function apply this structure as a rotation (quaternion) in float4x4 matrix construction. Though I'm not sure of how to apply rotation to matrix (seems we can use this as an example)
• Using unity built-in Unity.Transform systems to have float4x4 matrix and pass this value to shader (in this way all we need is to just stop using Transform2D from this foundation and use built-in solution + register it's matrix component as instanced, if I'm not mistaken it called something like LocalToWorld)
• Constructing 2D matrix as it goes in built-in Unity.Transforms matrix but only for 2D needs. It can be smaller matrix or just leave unused 4x4 matrix components in default values. Then as previous way says - pass it in shader as StructuredBuffer<float4x4>.

[Antoshidza]

After a bit thinking I've decide that

• If you want to use 2D it is better to implement 2D rotation to avoid passing and allocate unnecessary data + still possible to do this
• If you want to use 3D then it is better to stick with unity's Unity.Transforms and register theirs components as instanced components for NSprites.

What type of game you developing? 2D / 2,5D / 3D ?

[JeroenoBoy]

Hi, the game I'm currently making is 2d. If you want an idea of what I'm trying to make, think reassembly, but way bigger.

[JeroenoBoy]

After some fiddeling around, I've got it to work on my fork https://github.com/JeroenoBoy/Fundering

[Antoshidza]

That's good. I've been on vacation, so now can return to work. I need to complete authoring refactoring, and then merge your changes, because I see that you also find and fix those bugs.

[Antoshidza]

From now this package allows rotations (merged). Thanks for @JeroenoBoy