Is GaussianSplatComponent different than other Components?

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Created 22h

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I have been analyzing Apple's Gaussian-Splats-on-visionOS demo project, and it appears that the GaussianSplatComponent is treated differently than other Components.

In the function makeSplatEntity(), a GaussianSplatComponent is created and added to an Entity's components:

let comp = try assembleSplatComponent(from: buffers, isLinear: isLinear)
let entity = Entity()
entity.components.set(comp)

But when I check the entity's components collection before and after the add/set, nothing has changed. The entity still has the same children.

Is the GaussianSplatComponent stored in a different location in the Entity? If so, is it a public property I can inspect?

(Or is my interpretation of the components system wrong?)

Here are the results of print statements before and after the set()

BEFORE ADDING COMPONENT
Entity number of components: 2
Component: Transform(scale: SIMD3<Float>(1.0, 1.0, 1.0), rotation: simd_quatf(real: 1.0, imag: SIMD3<Float>(0.0, 0.0, 0.0)), translation: SIMD3<Float>(0.0, 0.0, 0.0))
Component: RealityKit.SynchronizationComponent

AFTER ADDING COMPONENT
Entity number of components: 2
Component: Transform(scale: SIMD3<Float>(1.0, 1.0, 1.0), rotation: simd_quatf(real: 1.0, imag: SIMD3<Float>(0.0, 0.0, 0.0)), translation: SIMD3<Float>(0.0, 0.0, 0.0))
Component: RealityKit.SynchronizationComponent

Answer 1

Vision Pro Engineer OP

Apple

14h

Hey @THeberlein,

It seems to me that this is unexpected. I'd greatly appreciate it if you could open a bug report for this issue and post the FB number here once you do.

Bug Reporting: How and Why? has tips on creating your bug report.

You can check if an entity has this component and inspect the component properties using the following APIs:

entity.components.has(GaussianSplatComponent.self)
entity.components[GaussianSplatComponent.self]?.splatResource.projectionMode

Thanks,
Michael