Can I apply a scale-transformation to an instanced mesh without it affecting the aabb?

[Saetch]

Hello!
I'm using InstancedMesh with a lot of instances to render 2D images to the screen. It works really well for the most part, but I wondered if I can somehow prevent the aabb from shrinking when I scale the instanced mesh down, which is what I suspect is what resulted in the weird behavior I ran into. Maybe it is something else tho, but this is what I suspect.

So, my images are too large and I applied a Mat4::from_scale transformation to the instancedMesh. This works fine for the most part, but it seems to shrink the aabb down aswell. I inspected this and it is way lower. I guess this is what results in this behavior when I run it (note that it is completely fine when I don't scale it down):

rendering.mp4

My guess what happens is that the aabb shrinks down due to the scaling but the Mat4::from_translation that I use on the instances doesn't result in correctly updating it? Different translations for my instances result in different sizes for the aabb, but as soon as I move them a bit further from the center, they very easily stop being rendered when I move the camera.
I tried manually setting the aabb, but instanced_mesh.aabb() seems to create a new object and doesn't let me modify the one that is actually being used for rendering.
Now, it works fine again, when I instead use the scale transformation on every single instance and remove it from the instanced mesh, the aabb then seems to be fine aswell. But I would like to know if I can set this once for all of the instances, which is what InstancedMesh::set_transformation seems to be meant for, and make it work in a way that is expected.

Thanks in advance :)

[asny]

Hi. Thanks for the report 🙏 You actually discovered a bug, the bounding box calculations are wrong in the case where you apply a global transformation and a transformation for each instance and when one affect the other. I managed to reproduce it by changing the instanced_shapes example slightly. I created this issue and hopefully fixed it in #528. Maybe I can get you to test it before I make a release?

[Saetch]

@asny
Hey, thanks for the quick update!
I tested my use-case with the new rev and it works flawlessly :)

[asny]

Perfect, thanks for testing 👌 I'll make a minor release soon.

[asny]

Released 0.18.1 with the fix 💪