feat: improve screen alighment on show/hide

src/backend/common.rs

@@ -499,3 +499,23 @@ pub fn raycast_cylinder(
 
     Some((t, hit_local.xy()))
 }
+
+pub fn snap_upright(transform: Affine3A, up_dir: Vec3A) -> Affine3A {
+    if transform.x_axis.dot(up_dir).abs() < 0.2 {
+        let scale = transform.x_axis.length();
+        let col_z = transform.z_axis.normalize();
+        let col_y = up_dir;
+        let col_x = col_y.cross(col_z);
+        let col_y = col_z.cross(col_x).normalize();
+        let col_x = col_x.normalize();
+
+        Affine3A::from_cols(
+            col_x * scale,
+            col_y * scale,
+            col_z * scale,
+            transform.translation,
+        )
+    } else {
+        transform
+    }
+}