MetalByTutorials/09-scene-graph/README.md

Chapter 9: The Scene Graph

As I read this book, I summarize what I think is wrong. If you think my comments are wrong then please let me know. We can dicuss more and update your opinion.

The scene graph

• You can also remove the light when you cleanup your code. In Scene.swift, add this:

var lighting = Lighting()

In Renderer.swift, in func draw(in view: MTKView), replace:

var lights = lighting.lights

With:

var lights = scene.lighting.lights

• If you remove a camera in 'Renderer', you need to update override func scrollWheel(with event: NSEvent) in ViewControllerExtension.swift, replace:

override func scrollWheel(with event: NSEvent) {
  renderer?.camera.zoom(delta: Float(event.deltaY))
}

With:

override func scrollWheel(with event: NSEvent) {
  renderer?.scene?.camera.zoom(delta: Float(event.deltaY))
}