RealityKit – Text mesh resource performance warning

Question

I have an object in RealityKit that I hover some text over. I make the text using the built in static function on MeshResource like this.

let textMesh = MeshResource.generateText("Some text", extrusionDepth: 0.01, font: MeshResource.Font.systemFont(ofSize: 0.05), containerFrame: .zero, alignment: .center, lineBreakMode: .byTruncatingTail)
let material = SimpleMaterial(color: .green, isMetallic: false)
let textEntity = ModelEntity(mesh: textMesh, materials: [material])

The text shows up but I get warnings from ARKit (RealityKit) about using a wrong font type and something about performance? These logs fill up my terminal because I actually update the text in the ARView regularly. This is how I update the text.

let textMesh = MeshResource.generateText("Some new text", extrusionDepth: 0.01, font: MeshResource.Font.systemFont(ofSize: 0.05), containerFrame: .zero, alignment: .center, lineBreakMode: .byTruncatingTail)
//textEntity variable gets stored in my app so I can keep track of it / them out side ARView
textEntity?.model?.mesh = textMesh

Here is the warning. I get hundreds of them but I'll only burden you with one.

CoreText performance note: Client called CTFontCreateWithName() using name "System Font Regular" and got font with PostScript name ".SFUI-Regular". For best performance, only use PostScript names when calling this API.

I would prefer to resolve this warning but if I can't and it's just something I have to live with until Apple iterates this framework can I at least silence it somehow?

Answer 1

Solution

You can try Helvetica font. But there's no 100% guarantee that it'll fix the issue in any Xcode version.

let textEntity = ModelEntity(mesh: .generateText("RealityKit", 
                             font: .init(name: "Helvetica", size: 0.5)!))

But 99% of the time it worked.

About warnings

Console warnings come from RealityKit .cpp files. To silence them, go to Xcode menu Product –> Scheme –> Edit Scheme and add to environment dictionary OS_ACTIVITY_MODE key with its corresponding disable value.

OS_ACTIVITY_MODE = disable

At the moment, it's the most efficient way to disable RealityKit 2.0 warnings.

You can check this in ViewController with:

print(ProcessInfo.processInfo.environment["OS_ACTIVITY_MODE"])

// Result:  disable