carlyn (@carlynorama@mastodon.social)

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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Edited 1y ago

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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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