fix(grid): remove implicit drawing limits

Cargo.lock

@@ -78,7 +78,7 @@ checksum = "366ffbaa4442f4684d91e2cd7c5ea7c4ed8add41959a31447066e279e432b618"
 [[package]]
 name = "acadrust"
 version = "0.4.0"
-source = "git+https://github.com/OpenAEC-Foundation/acadifc.git?rev=a66b0d9#a66b0d994c052e446fd0d6168bef9ec2b2aceed8"
+source = "git+https://github.com/OpenAEC-Foundation/acadifc.git?rev=5a2069a#5a2069a7abe6b440fbd3bbacb4dfff8555f082c9"
 dependencies = [
  "ahash 0.8.12",
  "anyhow",
@@ -3259,7 +3259,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b577e2d69827c4740cba2b52efaad1c4cc7c73042860b199710b3575c68438d"
 dependencies = [
  "bytecount",
- "memchr 2.8.3",
+ "memchr 1.0.2",
  "nom 8.0.0",
 ]
 

Cargo.toml

@@ -98,7 +98,7 @@ windows-sys = { version = "0.61", features = ["Win32_UI_Shell", "Win32_UI_Window
 
 [patch.crates-io]
 # Track standard DWG object relationships used by the scene integration.
-acadrust = { git = "https://github.com/OpenAEC-Foundation/acadifc.git", rev = "a66b0d9" }
+acadrust = { git = "https://github.com/OpenAEC-Foundation/acadifc.git", rev = "5a2069a" }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 # Native enables the plugin host runtime (out-of-process plugins).

src/app/document.rs

@@ -438,7 +438,7 @@ impl DocumentTab {
     pub(super) fn new_drawing(n: usize) -> Self {
         let mut scene = Scene::new();
         linetypes::populate_document(&mut scene.document);
-        // Override acadrust's imperial default limits (12×9) with A4 landscape.
+        // Paper layouts start as A4 landscape.
         for obj in scene.document.objects.values_mut() {
             if let acadrust::objects::ObjectType::Layout(l) = obj {
                 if l.name != "Model" {

src/ui/overlay.rs

@@ -1589,6 +1589,28 @@ fn draw_grid(
             }
         }
         draw_segments(frame, &segments);
+
+        // LIMITS bounds the grid, not the UCS axes. Size the axes from the
+        // visible grid plane so X/Y/Z still span the viewport even when the
+        // finite grid rectangle is small or currently off-screen.
+        let axis_extent = samples.iter().fold(0.0_f32, |extent, (_, world)| {
+            let delta = (*world - grid_origin).as_vec3();
+            extent
+                .max(delta.dot(axis1).abs())
+                .max(delta.dot(axis2).abs())
+        });
+        if axis_extent > 0.0 {
+            let extent = (axis_extent + s) * 1.5;
+            draw_axes(
+                frame,
+                view_rot,
+                eye,
+                bounds,
+                extent.max(10.0),
+                grid_origin,
+                (gx, gy, gz),
+            );
+        }
         return;
     }