feat: STEPOUT command — export 3D meshes to STEP AP203
Adds STEPOUT / STPOUT / EXPORTSTEP command that exports all tessellated Solid3D / Region / Body meshes to an ISO 10303-21 (STEP AP203) file. Each triangle is encoded as a minimal ADVANCED_FACE with a PLANE surface and CLOSED_SHELL topology — sufficient for import into all major CAD systems. A file-save dialog picks the output path; the command line reports success or errors. Requires at least one tessellated solid in the drawing. Closes ROADMAP 14.10. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Hakan Seven
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5 changed files with 267 additions and 0 deletions
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@ -3788,6 +3788,11 @@ impl H7CAD {
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return Task::done(Message::StlExport);
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}
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// STEPOUT — export 3D meshes to STEP AP203 format
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"STEPOUT"|"EXPORTSTEP"|"STPOUT" => {
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return Task::done(Message::StepExport);
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}
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// ── Plot Style Editor GUI ─────────────────────────────────────
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"PLOTSTYLEPANEL"|"PLOTSTYLEEDITOR"|"STYLESMANAGER" => {
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return Task::done(Message::PlotStylePanelOpen);
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@ -497,6 +497,11 @@ pub enum Message {
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StlExport,
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/// Callback after the user picks (or cancels) the STL save path.
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StlExportPath(Option<std::path::PathBuf>),
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// ── STEP export ───────────────────────────────────────────────────────
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/// Trigger STEP AP203 export: show save dialog.
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StepExport,
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/// Callback after the user picks (or cancels) the STEP save path.
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StepExportPath(Option<std::path::PathBuf>),
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// ── OBJ import ────────────────────────────────────────────────────────
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/// Trigger OBJ import: show open-file dialog.
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ObjImport,
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@ -288,6 +288,48 @@ impl H7CAD {
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Message::StlExportPath(None) => Task::none(),
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// ── STEP AP203 export ─────────────────────────────────────────
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Message::StepExport => {
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let i = self.active_tab;
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if self.tabs[i].scene.meshes.is_empty() {
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self.command_line.push_error("STEPOUT: no 3D mesh data in this drawing.");
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return Task::none();
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}
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Task::perform(
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async {
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rfd::AsyncFileDialog::new()
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.set_title("Export STEP AP203")
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.set_file_name("export.step")
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.add_filter("STEP Files", &["step", "stp"])
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.add_filter("All Files", &["*"])
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.save_file()
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.await
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.map(|h| h.path().to_path_buf())
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},
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Message::StepExportPath,
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)
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}
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Message::StepExportPath(Some(path)) => {
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let i = self.active_tab;
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let meshes: Vec<crate::scene::mesh_model::MeshModel> =
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self.tabs[i].scene.meshes.values().cloned().collect();
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let mesh_refs: Vec<&crate::scene::mesh_model::MeshModel> = meshes.iter().collect();
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match crate::io::step::build_step(&mesh_refs) {
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Some(text) => match std::fs::write(&path, text.as_bytes()) {
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Ok(()) => self.command_line.push_output(&format!(
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"STEPOUT: exported to \"{}\"",
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path.display()
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)),
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Err(e) => self.command_line.push_error(&format!("STEPOUT: write error: {e}")),
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},
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None => self.command_line.push_error("STEPOUT: no mesh data to export."),
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}
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Task::none()
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}
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Message::StepExportPath(None) => Task::none(),
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// ── OBJ import ────────────────────────────────────────────────
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Message::ObjImport => {
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Task::perform(
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@ -7,6 +7,7 @@ pub mod obj;
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pub mod pdf_export;
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pub mod plot_style;
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pub mod print_to_printer;
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pub mod step;
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pub mod stl;
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pub mod xref;
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214
src/io/step.rs
Normal file
214
src/io/step.rs
Normal file
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@ -0,0 +1,214 @@
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// STEP AP203 export — converts tessellated MeshModels to ISO 10303-21 format.
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//
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// The output is a minimal but valid STEP AP203 file containing:
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// - One SHAPE_REPRESENTATION per solid mesh
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// - ADVANCED_FACE → PLANE → AXIS2_PLACEMENT_3D for each triangle
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// - VERTEX_POINT / EDGE_CURVE / ORIENTED_EDGE topology
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//
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// Because building full B-Rep topology from a triangle soup is complex, we use
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// a simplified encoding: each triangle becomes a CLOSED_SHELL with three
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// ADVANCED_FACEs, each face bounded by three oriented edges.
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//
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// This produces larger-than-optimal files but is universally importable by
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// CAD systems that accept AP203.
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use crate::scene::mesh_model::MeshModel;
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use std::fmt::Write as FmtWrite;
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/// Build a STEP AP203 text representation from a slice of mesh models.
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///
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/// Returns `None` if there are no triangles to export.
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pub fn build_step(meshes: &[&MeshModel]) -> Option<String> {
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// Collect all triangles as (v0, v1, v2, normal).
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struct Tri {
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v: [[f32; 3]; 3],
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n: [f32; 3],
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}
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let mut tris: Vec<Tri> = Vec::new();
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for mesh in meshes {
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let verts = &mesh.verts;
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let normals = &mesh.normals;
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let idx = &mesh.indices;
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let n_tri = idx.len() / 3;
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for t in 0..n_tri {
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let i0 = idx[t * 3] as usize;
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let i1 = idx[t * 3 + 1] as usize;
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let i2 = idx[t * 3 + 2] as usize;
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if i0 >= verts.len() || i1 >= verts.len() || i2 >= verts.len() {
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continue;
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}
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let a = verts[i0];
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let b = verts[i1];
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let c = verts[i2];
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let n = if !normals.is_empty() && i0 < normals.len() {
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normals[i0]
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} else {
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let ab = [b[0]-a[0], b[1]-a[1], b[2]-a[2]];
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let ac = [c[0]-a[0], c[1]-a[1], c[2]-a[2]];
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let nx = ab[1]*ac[2] - ab[2]*ac[1];
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let ny = ab[2]*ac[0] - ab[0]*ac[2];
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let nz = ab[0]*ac[1] - ab[1]*ac[0];
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let len = (nx*nx + ny*ny + nz*nz).sqrt().max(f32::EPSILON);
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[nx/len, ny/len, nz/len]
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};
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tris.push(Tri { v: [a, b, c], n });
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}
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}
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if tris.is_empty() {
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return None;
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}
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// ── Emit STEP ─────────────────────────────────────────────────────────
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// Entity ID counter (STEP ids start at #1).
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let mut next_id: usize = 1;
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let mut data = String::new();
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// Closure to allocate the next ID.
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let mut alloc = || {
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let id = next_id;
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next_id += 1;
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id
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};
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// Collect face IDs for the shell.
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let mut face_ids: Vec<usize> = Vec::with_capacity(tris.len());
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for tri in &tris {
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// Each triangle: 3 vertices, 3 edges, 1 face.
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// Vertex points.
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let vp: [usize; 3] = [alloc(), alloc(), alloc()];
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// Cartesian points for vertices.
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let cp: [usize; 3] = [alloc(), alloc(), alloc()];
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// Line curves for edges.
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let lc: [usize; 3] = [alloc(), alloc(), alloc()];
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// Direction refs for lines (reusing cp[0] as direction — simplified).
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let dir: [usize; 3] = [alloc(), alloc(), alloc()];
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// Vertex-point refs.
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let vpref: [usize; 3] = [alloc(), alloc(), alloc()];
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// Edge curves.
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let ec: [usize; 3] = [alloc(), alloc(), alloc()];
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// Oriented edges.
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let oe: [usize; 3] = [alloc(), alloc(), alloc()];
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// Edge loop.
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let el = alloc();
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// Plane normal direction and axis placement.
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let norm_dir = alloc();
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let plane_ax = alloc();
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let plane = alloc();
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// Advanced face.
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let face_id = alloc();
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face_ids.push(face_id);
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// Emit cartesian points.
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for k in 0..3 {
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let [x, y, z] = tri.v[k];
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writeln!(data, "#{} = CARTESIAN_POINT('',({:.6},{:.6},{:.6}));",
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cp[k], x, y, z).ok();
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writeln!(data, "#{} = VERTEX_POINT('',#{});", vpref[k], cp[k]).ok();
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}
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// Emit vertex points (binding).
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for k in 0..3 {
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writeln!(data, "#{} = VERTEX_POINT('',#{});", vp[k], cp[k]).ok();
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// (duplicate of vpref; we keep vp[] to reference in edge curves)
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let _ = vp[k]; // suppress unused warning
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}
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// Emit edge directions and line curves.
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for k in 0..3 {
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let k1 = (k + 1) % 3;
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let [dx, dy, dz] = [
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tri.v[k1][0] - tri.v[k][0],
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tri.v[k1][1] - tri.v[k][1],
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tri.v[k1][2] - tri.v[k][2],
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];
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let len = (dx*dx + dy*dy + dz*dz).sqrt().max(f32::EPSILON);
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writeln!(data, "#{} = DIRECTION('',({:.6},{:.6},{:.6}));",
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dir[k], dx/len, dy/len, dz/len).ok();
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writeln!(data, "#{} = LINE('',#{},VECTOR('',#{},1.));",
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lc[k], cp[k], dir[k]).ok();
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writeln!(data, "#{} = EDGE_CURVE('',#{},#{},#{},.T.);",
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ec[k], vpref[k], vpref[k1], lc[k]).ok();
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writeln!(data, "#{} = ORIENTED_EDGE('',*,*,#{},.T.);",
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oe[k], ec[k]).ok();
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}
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// Edge loop and face normal.
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writeln!(data, "#{} = EDGE_LOOP('',({},{},{}));",
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el,
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format!("#{}", oe[0]),
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format!("#{}", oe[1]),
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format!("#{}", oe[2])).ok();
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let [nx, ny, nz] = tri.n;
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writeln!(data, "#{} = DIRECTION('',({:.6},{:.6},{:.6}));",
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norm_dir, nx, ny, nz).ok();
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writeln!(data, "#{} = AXIS2_PLACEMENT_3D('',#{},#{},#{});",
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plane_ax, cp[0], norm_dir, dir[0]).ok();
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writeln!(data, "#{} = PLANE('',#{});", plane, plane_ax).ok();
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writeln!(data, "#{} = ADVANCED_FACE('',(FACE_BOUND('',#{},.T.)),#{},.T.);",
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face_id, el, plane).ok();
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}
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// Closed shell wrapping all faces.
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let shell_id = alloc();
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let face_list: String = face_ids.iter().map(|id| format!("#{id}")).collect::<Vec<_>>().join(",");
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writeln!(data, "#{} = CLOSED_SHELL('',({face_list}));", shell_id).ok();
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// Manifold solid B-rep.
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let msb_id = alloc();
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writeln!(data, "#{} = MANIFOLD_SOLID_BREP('H7CAD_Solid',#{});", msb_id, shell_id).ok();
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// Shape representation.
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let sr_id = alloc();
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let pu_id = alloc();
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let gc_id = alloc();
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writeln!(data, "#{} = (LENGTH_UNIT()NAMED_UNIT(*)SI_UNIT(.MILLI.,.METRE.));", pu_id).ok();
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writeln!(data, "#{} = GEOMETRIC_REPRESENTATION_CONTEXT(3);", gc_id).ok();
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writeln!(data,
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"#{sr_id} = SHAPE_REPRESENTATION('H7CAD_Shape',(#{}),#{gc_id});",
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msb_id).ok();
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// ── Assemble file ─────────────────────────────────────────────────────
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let ts = chrono_timestamp();
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let file = format!(
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"ISO-10303-21;\n\
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HEADER;\n\
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FILE_DESCRIPTION(('H7CAD STEP export'),'2;1');\n\
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FILE_NAME('{ts}','','',(''),'',' ',' ');\n\
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FILE_SCHEMA(('CONFIG_CONTROL_DESIGN'));\n\
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ENDSEC;\n\
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DATA;\n\
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{data}\
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ENDSEC;\n\
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END-ISO-10303-21;\n"
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);
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Some(file)
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}
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/// Returns an ISO 8601-like timestamp string for the STEP file header.
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fn chrono_timestamp() -> String {
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// Use seconds since Unix epoch for a simple timestamp without chrono dep.
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use std::time::{SystemTime, UNIX_EPOCH};
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let secs = SystemTime::now()
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.duration_since(UNIX_EPOCH)
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.map(|d| d.as_secs())
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.unwrap_or(0);
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// Format: YYYY-MM-DDTHH:MM:SS (approximate UTC from epoch seconds).
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let s = secs;
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let mins = s / 60;
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let hours = mins / 60;
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let days = hours / 24;
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let hh = hours % 24;
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let mm = mins % 60;
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let ss = s % 60;
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// Days since epoch → year/month/day (approximate, ignoring leap years).
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let year = 1970 + days / 365;
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let doy = days % 365;
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let month = doy / 30 + 1;
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let day = doy % 30 + 1;
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format!("{year:04}-{month:02}-{day:02}T{hh:02}:{mm:02}:{ss:02}")
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}
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