WIP Add union model

Cargo.toml

@@ -15,6 +15,7 @@ members = [
  "models/group",
  "models/spacer",
  "models/star",
+ "models/union",
 
  "tools/export-validator",
  "tools/release-operator",

crates/fj-kernel/src/algorithms/intersection/curve_face.rs

@@ -3,7 +3,7 @@ use fj_math::Scalar;
 use crate::{geometry::Curve, topology::Face};
 
 /// Determine the intersection between a [`Curve`] and a [`Face`]
-pub fn curve_face(curve: &Curve, face: &Face) -> Vec<[Scalar; 2]> {
+pub fn curve_face(curve: &Curve<3>, face: &Face) -> Vec<[Scalar; 2]> {
  let line = match curve {
  Curve::Line(line) => line,
  _ => todo!("Curve-face intersection only supports lines"),

models/union/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "union"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies.fj]
+path = "../../crates/fj"

models/union/README.md

@@ -0,0 +1,11 @@
+# Fornjot - Union
+
+A model that demonstrates unions of bodies.
+
+To display this model, run the following from the repository root:
+``` sh
+cargo run -- --model union
+```
+
+**TASK: Add screenshot.**o
+![Screenshot of the union model](union.png)

models/union/src/lib.rs

@@ -0,0 +1,21 @@
+use std::collections::HashMap;
+
+use fj::syntax::*;
+
+#[no_mangle]
+pub extern "C" fn model(_: &HashMap<String, String>) -> fj::Shape {
+ #[rustfmt::skip]
+ let points = vec![
+ [-0.5, -0.5],
+ [ 0.5, -0.5],
+ [ 0.5, 0.5],
+ [-0.5, 0.5],
+ ];
+
+ let a = fj::Sketch::from_points(points).sweep([0., 0., 1.]);
+ let b = a.clone().translate([0.5, 0.5, 0.5]);
+
+ let union = a.union(&b);
+
+ union.into()
+}