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/
Edited 2y ago
![<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>](/proxy/post_attachment/165515/949ac410f3.png "<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 {
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>](/proxy/post_attachment/165516/fd84c1608d.png "<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 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>](/proxy/post_attachment/165501/52764df6b4.png "<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>")
