From f51c7b02f28f8bcea6663bd6a2762e9877c30dfc Mon Sep 17 00:00:00 2001
From: Adam Chalmers <adam.chalmers@zoo.dev>
Date: Wed, 12 Aug 2026 13:07:17 -0500
Subject: [PATCH 1/2] WIP

---
 modeling-cmds/openapi/api.json   | 28 ++++++++++++++++++++++++++++
 modeling-cmds/src/format/step.rs | 26 ++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/modeling-cmds/openapi/api.json b/modeling-cmds/openapi/api.json
index 7fba1ff8..34cfe9ac 100644
--- a/modeling-cmds/openapi/api.json
+++ b/modeling-cmds/openapi/api.json
@@ -2416,6 +2416,15 @@
                 "default": false,
                 "type": "boolean"
               },
+              "target_representation": {
+                "description": "What representation should be used for this file after it's imported?",
+                "default": "mesh",
+                "allOf": [
+                  {
+                    "$ref": "#/components/schemas/StepImportTargetRepresentation"
+                  }
+                ]
+              },
               "type": {
                 "type": "string",
                 "enum": [
@@ -9457,6 +9466,25 @@
           "path_id"
         ]
       },
+      "StepImportTargetRepresentation": {
+        "description": "After importing, how should this model's data be represented?",
+        "oneOf": [
+          {
+            "description": "Mesh of 2D geometry",
+            "type": "string",
+            "enum": [
+              "mesh"
+            ]
+          },
+          {
+            "description": "Boundary representation",
+            "type": "string",
+            "enum": [
+              "brep"
+            ]
+          }
+        ]
+      },
       "StepPresentation": {
         "description": "Describes the presentation style of the EXPRESS exchange format.",
         "oneOf": [
diff --git a/modeling-cmds/src/format/step.rs b/modeling-cmds/src/format/step.rs
index 9f53cee1..b8a54f62 100644
--- a/modeling-cmds/src/format/step.rs
+++ b/modeling-cmds/src/format/step.rs
@@ -5,6 +5,27 @@ use serde::{Deserialize, Serialize};
 
 use crate::coord;
 
+/// After importing, how should this model's data be represented?
+#[derive(Clone, Debug, Eq, Hash, PartialEq, Serialize, Deserialize, JsonSchema)]
+#[serde(rename = "StepImportTargetRepresentation", rename_all = "snake_case")]
+#[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
+#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
+#[cfg_attr(feature = "ts-rs", ts(export_to = "ModelingCmd.ts"))]
+#[cfg_attr(
+    feature = "python",
+    pyo3_stub_gen::derive::gen_stub_pyclass_enum,
+    pyo3::pyclass(name = "StepImportTargetRepresentation", from_py_object)
+)]
+#[cfg_attr(not(feature = "unstable_exhaustive"), non_exhaustive)]
+pub enum TargetRepresentation {
+    /// Mesh of 2D geometry
+    Mesh,
+    /// Boundary representation
+    Brep,
+}
+
+const DEFAULT_REPR: TargetRepresentation = TargetRepresentation::Mesh;
+
 /// Import models in STEP format.
 pub mod import {
     use super::*;
@@ -35,6 +56,10 @@ pub mod import {
         /// Defaults to `false` but is implicitly `true` when importing into the engine.
         #[builder(default)]
         pub split_closed_faces: bool,
+
+        /// What representation should be used for this file after it's imported?
+        #[builder(default = DEFAULT_REPR)]
+        pub target_representation: TargetRepresentation,
     }
 
     #[cfg(feature = "python")]
@@ -51,6 +76,7 @@ pub mod import {
     impl Default for Options {
         fn default() -> Self {
             Self {
+                target_representation: DEFAULT_REPR,
                 coords: *coord::KITTYCAD,
                 split_closed_faces: false,
             }

From 79dfbcb5da0ad9cd1072dd6a61965affa7c3c155 Mon Sep 17 00:00:00 2001
From: Adam Chalmers <adam.chalmers@zoo.dev>
Date: Wed, 12 Aug 2026 13:21:14 -0500
Subject: [PATCH 2/2] Change default to brep

---
 modeling-cmds/openapi/api.json   | 2 +-
 modeling-cmds/src/format/step.rs | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/modeling-cmds/openapi/api.json b/modeling-cmds/openapi/api.json
index 34cfe9ac..7d86cfbc 100644
--- a/modeling-cmds/openapi/api.json
+++ b/modeling-cmds/openapi/api.json
@@ -2418,7 +2418,7 @@
               },
               "target_representation": {
                 "description": "What representation should be used for this file after it's imported?",
-                "default": "mesh",
+                "default": "brep",
                 "allOf": [
                   {
                     "$ref": "#/components/schemas/StepImportTargetRepresentation"
diff --git a/modeling-cmds/src/format/step.rs b/modeling-cmds/src/format/step.rs
index b8a54f62..c0804c14 100644
--- a/modeling-cmds/src/format/step.rs
+++ b/modeling-cmds/src/format/step.rs
@@ -24,7 +24,7 @@ pub enum TargetRepresentation {
     Brep,
 }
 
-const DEFAULT_REPR: TargetRepresentation = TargetRepresentation::Mesh;
+const DEFAULT_REPR: TargetRepresentation = TargetRepresentation::Brep;
 
 /// Import models in STEP format.
 pub mod import {