How to use Sprite.overrideGeometry?

Basically the same question as this thread: http://forum.unity3d.com/threads/how-to-make-sprite-overridegeometry-work.297505/

But that was posted in the Unity5-beta only forums which I assume aren't being followed as closely now that Unity 5 is released (I also can't reply to that thread).

When attempting to use Sprite.overrideGeometry, I get the following error:

Not allowed to override geometry on sprite ''

It seems like a hold-over from the Pro vs Free feature limitations of Unity 4.x, but maybe there is something I'm missing.

 

Yes I was. My goal is to make a tile-map editor extension. I've actually got a fair amount of progress, but the underlying system uses 3D meshes, mesh-renderers and textures.

I saw this method and thought I could use it to convert the visual representation to custom 2D sprites, and leverage the sprite-specific bits of Unity's workflow (sprite editor, pixels-per-unit, etc).

Apparently, this isn't possible. I also would have needed to provide custom uvs to the sprite's mesh, which I wasn't sure how to accomplish with Sprite.OverrideGeometry, but the point it moot now.

 

I see. Does Unity have any plans (near or long-term) to extend this functionality to Editor time, or even runtime?

As an aside, I'm kinda surprised that there is no way to override the UVs, even at import time. My use-case may be atypical but certainly anybody who is tweaking/altering a sprite's mesh is going to want to be able to tweak the UVs at the same time? Otherwise we're at the mercy of whatever mapping algorithm Unity uses for the new geometry.

 

Good to hear! Thanks for the info, Kuan

 

any progress on this, I would also like to be able to edit the Sprite class vertices, triangles, uv and texture used.
Thanks

 

Try to override the geometry in AssetPostprocessor.OnPostprocessSprites in Editor
It should be working!

 

I need to do this at runtime, for sprites loaded dynamically (from a TexturePacker sheet, if you must know).

Is there really (still) no way to do this?

 

I want to override Sprite's uv, too.

 

@Kuan Any progress on this since 2015?

 

or 2019?

 

Or 2020?

 

can you give some simple sample code that shows how to use SetVertexAttribute.
Why is there no way to simply assign all mesh vertices to a sprite?

 

There is example here:
https://forum.unity.com/threads/vector-graphics-preview-package.529845/page-5#post-3604917

Here a minimalist code:

Code (CSharp):

1.  var uv = sprite.GetVertexAttribute<Vector2>(VertexAttribute.TexCoord0);
2. var uvs = new NativeArray<Vector2>(uv.Length, Allocator.Temp);
3. uvs.CopyFrom(spriteUV);
4. sprite.SetVertexAttribute(VertexAttribute.TexCoord0, uvs);