I'm converting my game from SceneKit to RealityKit. It has a SpriteKit overlay that according to Explore advanced rendering with RealityKit 2 I can add with the code below.
The code runs fine if the SKScene only contains a SKSpriteNode (see the commented out line), but when I add a SKShapeNode with a fillColor instead, the app crashes with this error:
-[MTLDebugRenderCommandEncoder validateCommonDrawErrors:]:5970: failed assertion `Draw Errors Validation
MTLDepthStencilDescriptor uses frontFaceStencil but MTLRenderPassDescriptor has a nil stencilAttachment texture
MTLDepthStencilDescriptor uses backFaceStencil but MTLRenderPassDescriptor has a nil stencilAttachment texture
'
I don't know enough about low-level graphics and stencils yet to figure out a quick solution, so I would appreciate if anyone could share an easy fix or explanation of what's wrong. Thanks!
class ViewController: NSViewController {
var device: MTLDevice!
var renderer: SKRenderer!
override func loadView() {
let arView = ARView(frame: NSScreen.main!.frame)
view = arView
arView.renderCallbacks.prepareWithDevice = { [weak self] device in
guard let self = self else { return }
self.device = device
renderer = SKRenderer(device: MTLCreateSystemDefaultDevice()!)
let scene = SKScene()
let shape = SKShapeNode(rectOf: CGSize(width: 10, height: 10))
shape.fillColor = .red
scene.addChild(shape)
// scene.addChild(SKSpriteNode(color: .red, size: CGSize(width: 10, height: 10)))
renderer.scene = scene
}
arView.renderCallbacks.postProcess = { [weak self] context in
guard let self = self else { return }
let encoder = context.commandBuffer.makeBlitCommandEncoder()
encoder?.copy(from: context.sourceColorTexture, to: context.targetColorTexture)
encoder?.endEncoding()
renderer.update(atTime: context.time)
let descriptor = MTLRenderPassDescriptor()
descriptor.colorAttachments[0].loadAction = .load
descriptor.colorAttachments[0].storeAction = .store
descriptor.colorAttachments[0].texture = context.targetColorTexture
renderer.render(withViewport: CGRect(x: 0, y: 0, width: context.targetColorTexture.width, height: context.targetColorTexture.height), commandBuffer: context.commandBuffer, renderPassDescriptor: descriptor)
}
}
}
