diff --git a/modeling-cmds/openapi/api.json b/modeling-cmds/openapi/api.json
index 67c40729..12d5defa 100644
--- a/modeling-cmds/openapi/api.json
+++ b/modeling-cmds/openapi/api.json
@@ -7373,6 +7373,46 @@
               "type"
             ]
           },
+          {
+            "description": "A general exact curve segment. Start at the current path \"pen\" and end at the final control point. In the first pass this is used for non-rational open-uniform spline curves.",
+            "type": "object",
+            "properties": {
+              "degree": {
+                "description": "Degree of the curve.",
+                "type": "integer",
+                "format": "uint32",
+                "minimum": 0
+              },
+              "points": {
+                "description": "Ordered control points for the curve. The final 3D point becomes the new path \"pen\" position.",
+                "type": "array",
+                "items": {
+                  "$ref": "#/components/schemas/Point4d"
+                }
+              },
+              "rational": {
+                "description": "Whether to use the homogeneous `w` component as a rational weight.",
+                "type": "boolean"
+              },
+              "relative": {
+                "description": "Whether or not this curve is a relative offset",
+                "type": "boolean"
+              },
+              "type": {
+                "type": "string",
+                "enum": [
+                  "curve"
+                ]
+              }
+            },
+            "required": [
+              "degree",
+              "points",
+              "rational",
+              "relative",
+              "type"
+            ]
+          },
           {
             "description": "Adds a tangent arc from current pen position with the given radius and angle.",
             "type": "object",
@@ -7733,20 +7773,16 @@
         "type": "object",
         "properties": {
           "w": {
-            "type": "number",
-            "format": "float"
+            "$ref": "#/components/schemas/LengthUnit"
           },
           "x": {
-            "type": "number",
-            "format": "float"
+            "$ref": "#/components/schemas/LengthUnit"
           },
           "y": {
-            "type": "number",
-            "format": "float"
+            "$ref": "#/components/schemas/LengthUnit"
           },
           "z": {
-            "type": "number",
-            "format": "float"
+            "$ref": "#/components/schemas/LengthUnit"
           }
         },
         "required": [
diff --git a/modeling-cmds/src/def_enum.rs b/modeling-cmds/src/def_enum.rs
index 374171d3..d0d010a0 100644
--- a/modeling-cmds/src/def_enum.rs
+++ b/modeling-cmds/src/def_enum.rs
@@ -1600,7 +1600,7 @@ define_modeling_cmd_enum! {
             /// The default color to use for highlight
             #[serde(default)]
             pub highlight_color: Option<Color>,
-            /// The default color to use for selection 
+            /// The default color to use for selection
             #[serde(default)]
             pub selection_color: Option<Color>,
         }
diff --git a/modeling-cmds/src/shared.rs b/modeling-cmds/src/shared.rs
index a8efb471..0fc31332 100644
--- a/modeling-cmds/src/shared.rs
+++ b/modeling-cmds/src/shared.rs
@@ -620,7 +620,7 @@ pub enum CameraDragInteractionType {
 
 /// A segment of a path.
 /// Paths are composed of many segments.
-#[derive(Debug, Clone, Copy, Serialize, Deserialize, JsonSchema, PartialEq)]
+#[derive(Debug, Clone, Serialize, Deserialize, JsonSchema, PartialEq)]
 #[serde(rename_all = "snake_case", tag = "type")]
 #[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
 #[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
@@ -662,6 +662,20 @@ pub enum PathSegment {
         ///Whether or not this bezier is a relative offset
         relative: bool,
     },
+    /// A general exact curve segment.
+    /// Start at the current path "pen" and end at the final control point.
+    /// In the first pass this is used for non-rational open-uniform spline curves.
+    Curve {
+        /// Degree of the curve.
+        degree: u32,
+        /// Whether to use the homogeneous `w` component as a rational weight.
+        rational: bool,
+        /// Ordered control points for the curve.
+        /// The final 3D point becomes the new path "pen" position.
+        points: Vec<Point4d<LengthUnit>>,
+        ///Whether or not this curve is a relative offset
+        relative: bool,
+    },
     /// Adds a tangent arc from current pen position with the given radius and angle.
     TangentialArc {
         /// Radius of the arc.