carlyn (@carlynorama@mastodon.social)

2y

A week later... Day 6 of learning the USD file format ended up being a bit of a rehash of Day one, but using a Swift script instead of a Python script. Having the validation tools installed and ready also helped! (Still no beta software required)

https://www.whynotestflight.com/excuses/hello-usd-part-6-same-as-part-1...-but-swift/

#SwiftLang #Swift #OpenUSD #visionOSDev #visonOS #macOS #Scripting

Blobby amalgam of 13 spheres, each a different color. The image is a screen shot of a "QuickLook" window.

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2y

Part 7: Getting to (non-beta) ARKit compliance for my scripted usda outputs is going to be uglier than I had hoped since usdc files are required.

Figured that out by coaxing the Apple provided usdARKitChecker to pass through a little more info from usdchecker util, and then smooshed the files together using usdcat. Unclear on how to do this all in Swift down the line, but works for now!

https://www.whynotestflight.com/excuses/hello-usd-part-7-where-my-error-messages-at/

#shellScript #openUSD #python #macos #visionOs #ARKit #USDZTools

A clump of 13 spheres that looks remarkably like the previous post's clump of spheres, but the title on the QuickLook window holding it has a file name that ends with .usdc now.

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2y

Part 8: So I did A LOT yesterday, but worked too late on it to really write it up. So today all that gets written up is switching my Swift effort over to a Package with dual-targets (library and executable CLI) using ArgumentParser. It requires more setup than Part 6, Future Me will be relieved to have `--help` when she comes back to her script and does't remember what she did.

image from `swift run sketchpad -sc 4`

#ArgumentParser #SwiftLang #OpenUSD

https://www.whynotestflight.com/excuses/hello-usd-part-8-multiball-moves-to-a-package/

More spheres in a QuickLook window. Only 4, plus the "blue origin" one, this time.

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2y

Part 9: Okay, champion of the delaying tactic that I am… In order to understand USD I _have_ to make a Domain Specific Language for it? Riiight?? I used the attached code to make the attached image. The files it makes are still a bit of a puddle... but they do render.

https://www.whynotestflight.com/excuses/hello-usd-part-9-parlez-vous-multiball-dsl-starts-here/

#SwiftLang #Swift #GenerativeArt #CreativeCoding #OpenUSD #ResultBuilder #3D #DomainSpecificLanguage

$CODE ``` public struct MultiBallStage { public init(count:Int) { self.count = count } let count:Int let minTranslate = -4.0 let maxTranslate = 4.0 let minRadius = 0.8 let maxRadius = 2.0 public func buildStage() -> Canvas3D { Canvas3D { //blue origin sphere Sphere(radius: 1.0).color(red: 0, green: 0, blue: 1.0) //the multi in multiball for _ in 0..<count { Sphere(radius: Double.random(in: minRadius...maxRadius)) .color( red: Double.random(in: 0...1), green: Double.random(in: 0...1), blue: Double.random(in: 0...1) ) .translateBy(Vector.random(range: minTranslate...maxTranslate)) } } } } ```$

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Screenshot of randomly sized, colored and placed spheres… AGAIN. Still 13 of them. New colors and new layout.

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2y

Part 10: Turns out yesterday was a Reading Day. I have the libraries up and running, but it’s time to truly get the picture as to why USD is even a thing, and what made Apple choose it. A lot of the existing literature is for VFX folks, which I am not, so in addition to my Top Pick references there’s some added color for programmers.

https://www.whynotestflight.com/excuses/hello-usd-part-10-reading-day/

If you watch nothing else (39 min): https://www.nvidia.com/en-us/on-demand/session/gtcspring23-s52054/

Top WAT: https://developer.nvidia.com/isaac-sim

#nVidiaUSD #USD #OpenUSD #ReadTheDocs

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2y

Part 11: Wrote a Domain Specific Language... to write Domain Specific Languages! ha! An enum based tree and a Result Builder allowed me to write the attached code to produce the attached output.

playground ready code: https://gist.github.com/carlynorama/088fd2bb77cb9d4fabb0c55e50f780b5

process getting there: https://www.whynotestflight.com/excuses/hello-usd-part-11-gotta-make-it-easier-to-write-file-builders/

#SwiftLang, #DSL, #OpenUSD, #ResultBuilder, #Swift, #Enum, #DataStructures

<CODE> let document = Document {
"Header"
oneMoreDown
FunTag(content: bracketedMessage)
AttributedTag(name: "MEANING", attribute: 42) {
FunTag {
"Test"
bracketedMessage
}
}
Repeater(count: 3) {
"Hi!"
}
"Footer"
}

print(document.render())</CODE>

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<CODE> <FUNTAG>
<p>
I have a message
</p>
</FUNTAG>
<MEANING attribute="42">
<FUNTAG>
Test
<p>
I have a message
</p>
</FUNTAG>
</MEANING>
Hi!
Hi!
Hi!
Footer
<FUNTAG><p>I have a message</p></FUNTAG><MEANING attribute="42"><FUNTAG>Test<p>I have a message</p></FUNTAG></MEANING>Hi!Hi!Hi!Footer </CODE>

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2y

Part 12: Applying Part 11 to the actual FileBuilder’s will make making adding features to my 3D model builder so much easier.

Case and point the `sphereBuilder` func from the X3D file is so much prettier now, and I can make my openUSD files use the expanded bracket style to their hearts content without having to manage the `\n\t\t` mess myself.

https://www.whynotestflight.com/excuses/hello-usd-part-12-lets-make-these-filebuilders-cleaner/

#SwiftLang #Swift #X3D #OpenUSD #String #ResultBuilders

$<CODE> @StringBuilder func sphereBuilder(shape:Sphere) -> String { if !shape.transformations.isEmpty { for transform in shape.transformations { transformStart(transform:transform) } } "<shape>" "\t<appearance>" if !shape.surfaces.isEmpty { materialString(shape.surfaces) } "\t</appearance>" "\t<sphere radius='\(shape.radius)'></sphere>" "</shape>" if !shape.transformations.isEmpty { for _ in 0..<shape.transformations.count { transformClose() } } } func transformStart(transform:Transformation) -> String { switch transform { case .translate(let v): return "<transform translation='\(v.x) \(v.y) \(v.z)'>" // default: // fatalError() } } func transformClose() -> String { "</transform>" } </CODE>$

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$<CODE> func sphereBuilder(shape:Sphere) -> StringNodeable { var content = Tag("Shape") { Tag("Appearance") { if !shape.surfaces.isEmpty { //function unchanged from previous code for now //still needs updating at this point. materialString(shape.surfaces) } } "<Sphere radius='\(shape.radius)'></Sphere>" } if !shape.transformations.isEmpty { //Last closest to the content. let orderedTransforms = shape.transformations.reversed() for item in orderedTransforms { let attributes = transformAttribute(transform: item) content = Tag("Transform", attributes:attributes) { content } } } return content } func transformAttribute(transform:Transformation) -> Dictionary<String,String> { switch transform { case .translate(let v): return ["translation":"\(v.x) \(v.y) \(v.z)"] } } </CODE>$

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$<CODE> func sphereBuilder(shape:Sphere) -> StringNodeable { CurlyBraced(opening: "def Xform \"\(shape.id)\"", style: .expanded) { if !shape.transformations.isEmpty { transformString(shape:shape) } CurlyBraced(opening: "def \(shape.shapeName) \"\(shape.id.lowercased())\"", style: .expanded) { "\(extentString(shape: shape))" if !shape.surfaces.isEmpty { colorString(shape:shape) } "\(radiusString(shape.radius))" } } </CODE>$

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1y

“The best time to build a test was before the first commit. The next best time is now.” – Proverbious the Commitor, probably

https://www.whynotestflight.com/excuses/hello-usd-part-13-test-test-test/

#XCode #XCTest #SwiftLang #UnitTesting #Equatable

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1y

Part 14: Confirming everything runs on Linux with a GitHub Action and VM.

https://www.whynotestflight.com/excuses/hello-usd-part-14-now-to-get-github-to-run-the-tests/

#SwiftLang #SwiftOnLinux #GitHubActions

<code>
jobs:
build:
name: Build Linux
runs-on: ubuntu-latest
container:
image: swift:latest
steps:
- name: Checkout
uses: actions/checkout@v3
- name: Build
run: |
swift build -v
- name: Test
run: |
swift test -v
</code>

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1y

Part 15: Now, before I forget everything… Can a GitHub Action build and then cache OpenUSD? Yes, Virginia, it can.

EDIT: THE LINK!!! https://www.whynotestflight.com/excuses/hello-usd-part-15-can-a-github-action-cache-a-openusd-build/

#GitHubAction #Caching #OpenUSD

Screenshot of a GitHub repo’s Action cache control panel with several caches including one for a python build. Python caching not discussed in the article (yet?) but code available in the repo linked to in the article.

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1y

Part 16: Duct-tape, string and pieces of gum all the way down, but I can make Swift, via Process(), run anything from a OpenUSD build I want!! usdcat, usdchecker, python scripts that import pxr... THE WORKS! **(MacOS & Linux only)

https://www.whynotestflight.com/excuses/hello-usd-part-16-swift-just-sipping-openusd-through...-a-pipe/

#OpenUSD #SwiftLang #shell #python

Composite of two screenshots: A text editor with basic hello world text, and a QuickView window with our friend the sphere, once again. The usda file was generated with the code in the other attached image.

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$``` public func saveHelloWorld(to outputLocation:String) { let current = URL(string: #file) let dir = current!.deletingLastPathComponent() let message = try? shell("python3 \(dir)/python_scripts/hello_world.py \(outputLocation)") print("message:\(message ?? "no message")") } ```$

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1y

Part 17: In case anyone needs the data point, building OpenUSD on a Linux VM with only one processor allocated to it takes ~7 hours... BUT it did make it, and the code I thought would work on Linux is truly code I know works on Linux now:

https://www.whynotestflight.com/excuses/hello-usd-part-17-ill-build-openusd-on-my-vm-how-long-could-it-take/

#OpenUSD #Ubuntu #Linux #SwiftLang

Screenshot of Ubuntu desktop with VSCode open to USDTestingCLI.swift with the same output in the console as yesterday's post had from the MacOS build.

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1y

Part 18: It's not all refactoring and compiling after all! Made a sphere… out of Spheres!!!

https://www.whynotestflight.com/excuses/hello-usd-part-18-i-can-make-a-sphere-out-of-spheres/

#SwiftLang #Swift #OpenUSD #x3d #GenerativeArt #CreativeCoding #sphere #fibonacci

A QuickLook screen shot of a Sphere, made out of Spheres! It uses a fibonacci spiral algorithm to do the positional layout. The colors are based on the magnitude of x, y and z coordinates.

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<code>
func generatePoints(count:Int, radius:Double) -> [Vector] {
var points:[Vector] = []
for i in 0..<count {
let shiftedIndex = Double(i)+0.5

let polar:Double = acos(1 - 2*shiftedIndex/Double(count))
let azimuthal:Double = goldenAngle * shiftedIndex

// y-axis spindle instead.
points.append(Vector(
x: cos(azimuthal) * sin(polar),
y: cos(polar),
z: sin(azimuthal) * sin(polar)
).scaled(by: radius))
}
return points
} </code>

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1y

Part 19: Lat/Long layout was feeling left out. Had to go back and get it.

https://www.whynotestflight.com/excuses/hello-usd-part-19-i-just-plain-skipped-over-latitude-and-longitude/

#SwiftLang #Swift #OpenUSD #x3d #GenerativeArt #CreativeCoding #sphere

QuickLook window screenshot. Sphere of 82 spheres, each at a latitude/longtitude point. The spheres are sage/olive green at the top and blend to kind of perwinkle.

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QuickLook window screenshot. Sphere of 82 spheres, each sphere ring is at slice point. The spheres are sage/olive green at the top and blend to kind of perwinkle.

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1y

Part 20: I do like the quaint charm of a usd in a QuickLook window, but wow, the png's from usdrecord are dreamy. Not a stray pixel anywhere. And the highlight! So pretty.

For those who are interested - it uses stb, not libpng, to get a large number of image formats for very little code debt.

https://www.whynotestflight.com/excuses/hello-usd-part-20-hello-usdrecord/

https://github.com/nothings/stb

#OpenUSD #png #codehunting #usdrecord

Two rings side by side, each made from a collection of rainbow colored spheres. The one on the left rests on the velvety black background of the image. The one of the right lives in a light gray box that betrays its origin as a screen grab from QuickLook. The spheres in that one have jagged, polygonal edges. The one on the left each sphere has dorodango levels of polish and care.

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1y

Part 21: Inching forward on a refactor of the 3DCanvas so my usda file generator can do something other than Spheres! I'm not sure it’s the answer, but I did make a proof-of-concept SwiftUI/View style version. Modeled on work by @objcio (Thank you!)

https://www.whynotestflight.com/excuses/hello-usd-part-21-what-if-i-refactored-sketchpad-to-work-like-swiftui/

TL;DR: https://gist.github.com/carlynorama/3e6765d4a87aaaf3fe2f69abb14764ca

#SwiftLang #SwiftUI #FunWithResultBuilder

Code snippet that says it should never be called. Offered as humor. Actually real though. Lines 34-36 in linked gist.

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1y

Part 22: The transformation from Canvas -> Layer using a protocol based result builder is complete and now I can... drum roll please… still run multiball. But now I know about usdrecord so it’s prettier!

https://www.whynotestflight.com/excuses/hello-usd-part-22-the-control-flow-is-a-lie./

#SwiftLang #ResultBuilder #ForLoopMafia #OpenUSD

A collection of around a dozen spheres of various sizes and colors in a clump. This time it is not a screen shot of QuickLook so they’re all smooth and pretty on a transparent background.

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