Extract fj-export from fj-app

fj-app/Cargo.toml

@@ -18,7 +18,6 @@ futures = "0.3.21"
 nalgebra = "0.30.0"
 parry3d-f64 = "0.8.0"
 thiserror = "1.0.30"
-threemf = "0.2.0"
 tracing = "0.1.33"
 wgpu = "0.12.0"
 wgpu_glyph = "0.16.0"
@@ -36,6 +35,10 @@ features = ["env", "toml"]
 version = "0.5.0"
 path = "../fj"
 
+[dependencies.fj-export]
+version = "0.5.0"
+path = "../fj-export"
+
 [dependencies.fj-host]
 version = "0.5.0"
 path = "../fj-host"

fj-app/src/main.rs

@@ -9,6 +9,7 @@ use std::path::PathBuf;
 use std::time::Instant;
 
 use anyhow::anyhow;
+use fj_export::export;
 use fj_host::{Model, Parameters};
 use fj_operations::shape_processor::ShapeProcessor;
 use futures::executor::block_on;
@@ -65,27 +66,7 @@ fn main() -> anyhow::Result<()> {
         let shape = model.load_once(&parameters)?;
         let shape = shape_processor.process(&shape);
 
-        let vertices =
-            shape.mesh.vertices().map(|vertex| vertex.into()).collect();
-
-        let indices: Vec<_> = shape.mesh.indices().collect();
-        let triangles = indices
-            .chunks(3)
-            .map(|triangle| {
-                [
-                    triangle[0] as usize,
-                    triangle[1] as usize,
-                    triangle[2] as usize,
-                ]
-            })
-            .collect();
-
-        let mesh = threemf::TriangleMesh {
-            vertices,
-            triangles,
-        };
-
-        threemf::write(path, &mesh)?;
+        export(&shape.mesh, &path)?;
 
         return Ok(());
     }

fj-export/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "fj-export"
+version = "0.5.0"
+edition = "2021"
+
+description = "The world needs another CAD program."
+readme = "../README.md"
+repository = "https://github.com/hannobraun/fornjot"
+license = "0BSD"
+keywords = ["cad", "programmatic", "code-cad"]
+categories = ["encoding"]
+
+
+[dependencies]
+threemf = "0.3.0"
+
+[dependencies.fj-interop]
+version = "0.5.0"
+path = "../fj-interop"
+
+[dependencies.fj-math]
+version = "0.5.0"
+path = "../fj-math"

fj-export/src/lib.rs

@@ -0,0 +1,39 @@
+//! Exporting Fornjot models to external files
+
+#![deny(missing_docs)]
+
+use std::path::Path;
+
+use fj_interop::mesh::Mesh;
+use fj_math::Point;
+
+/// Export the provided mesh to the file at the given path
+///
+/// Currently only 3MF is supported as an export format. The file extension of
+/// the provided path is ignored.
+pub fn export(mesh: &Mesh<Point<3>>, path: &Path) -> Result<(), Error> {
+    let vertices = mesh.vertices().map(|vertex| vertex.into()).collect();
+
+    let indices: Vec<_> = mesh.indices().collect();
+    let triangles = indices
+        .chunks(3)
+        .map(|triangle| {
+            [
+                triangle[0] as usize,
+                triangle[1] as usize,
+                triangle[2] as usize,
+            ]
+        })
+        .collect();
+
+    let mesh = threemf::TriangleMesh {
+        vertices,
+        triangles,
+    };
+
+    threemf::write(path, &mesh)?;
+
+    Ok(())
+}
+
+pub use threemf::Error;