Post · Encryptr.net Social

@carlynorama@mastodon.social · 3 years ago

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.

carlyn

@carlynorama@mastodon.social replied · 3 years ago

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/

Hello USD - Part 8: Multiball moves to a Package

A list of distractions

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

carlyn

@carlynorama@mastodon.social replied · 3 years ago

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

Hello USD - Part 9: Parlez vous MultiBall? DSL starts here

A list of distractions

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

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))
}
}
}
}
``` — 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)) } } } } ```

carlyn

@carlynorama@mastodon.social replied · 3 years ago

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

NVIDIA Developer

Isaac Sim

Design, simulate, test, and train AI-based robots in a physically-based virtual environment.

NVIDIA

An Overview of Universal Scene Description (USD) for Building Virtual Worlds S52054 | GTC Digital Spring 2023 | NVIDIA On-Demand

Universal Scene Description is much more than just a file format

Hello USD - Part 10: Reading Day

A list of distractions

carlyn

@carlynorama@mastodon.social replied · 3 years ago

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

Hello USD - Part 11: Gotta make it easier to write file builders

A list of distractions

<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> — <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>

<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> — <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>

carlyn

@carlynorama@mastodon.social replied · 3 years ago

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

Hello USD - Part 12: Lets make these FileBuilders cleaner

A list of distractions

<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> — <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>

<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> — <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>

<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> — <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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