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+        <article data-uid="Release-Upgrading-GeometryRendering">
+          <h1 id="geometry-rendering-and-native-stability">Geometry, rendering and native stability</h1>
+
+<ul>
+<li><strong>Disposing a display or geometry object still in use no longer crashes the process.</strong> A client
+disconnect, a meshed-geometry reset or an app shutdown could take the process down with an access
+violation. <a class="xref" href="../../api/Hi.Disp.DispEngine.html">DispEngine</a> and <a class="xref" href="../../api/Hi.Cbtr.CubeTree.html">CubeTree</a> native calls are now gated against
+a concurrent dispose, and disposals run serialized on a single background chain —
+<a class="xref" href="../../api/Hi.Cbtr.CubeTree.html#Hi_Cbtr_CubeTree_IsDisposed">IsDisposed</a> reports the state and
+<a class="xref" href="../../api/Hi.Cbtr.CubeTree.html#Hi_Cbtr_CubeTree_DisposeBackground_">DisposeBackground</a> enqueues a tree, or a collection of its attachments,
+onto that chain.</li>
+<li><strong>Large geometry no longer freezes the UI.</strong> <a class="xref" href="../../api/Hi.NcMech.Solids.Solid.html">Solid</a> builds its display
+topology off-thread and draws a wire bounding box with a &ldquo;Loading&rdquo; mark until it is ready.</li>
+<li><strong><a class="xref" href="../../api/Hi.CutterLocations.ClStrips.ClStrip.html">ClStrip</a> raises a <code>Cleared</code> event after <code>Clear</code></strong>, pairing with
+the existing <code>PosAdded</code>.</li>
+<li><strong>A P/Invoke correctness sweep</strong> reconciled the managed declarations against the real export table.
+It fixed a non-existent export (<code>substraction_ExpandToBox3d</code>), two <code>void</code> natives declared as
+struct returns (a garbage register read), two <code>ToString</code> marshals that made the CLR free foreign
+memory, and a log-callback delegate nothing rooted against GC — native could call a dead thunk long
+after the P/Invoke returned. These are the crashes a user reports as &ldquo;it crashes randomly&rdquo;.</li>
+<li><strong>Milled step colours no longer go stale at random.</strong> Step colours are baked into the native cube-tree
+attachment, but the refresh only flagged the strip while the display cache was freed immediately, so a
+frame landing in that window rebuilt the cache from stale colours and nothing cleaned it again. The
+service now cleans the cache once more after the re-stamp. A paired fix stops an empty strip display
+window swallowing a pending recolor indefinitely.</li>
+<li><strong>The dimension bar reads on any background.</strong> It was a single hard-coded near-black stroke left over
+from the light-host era, invisible once the front end went dark. It is now drawn as a wider dark halo
+under a white main stroke, with the halo pushed back whole depth steps rather than the white pass
+nudged forward by half a depth LSB — which intermittently lost the depth test.</li>
+<li><strong>New geometry API.</strong> <a class="xref" href="../../api/Hi.Geom.Topo.CarveStl.html">CarveStl</a> is the managed face of the native exact
+triangle-CSG container. <a class="xref" href="../../api/Hi.Cbtr.CubeTree.html#Hi_Cbtr_CubeTree_Add_">Add</a> is the boolean-union counterpart of <code>Substract</code>,
+returning <a class="xref" href="../../api/Hi.Cbtr.UnmanagedAddition.html">UnmanagedAddition</a>, and <a class="xref" href="../../api/Hi.Machining.SweptableUtil.html#Hi_Machining_SweptableUtil_AddBySweepingVolume_">AddBySweepingVolume</a>
+mirrors <code>RemoveBySweepingVolume</code> — the geometry-layer symmetric point for additive processes. There is
+no deposition step in the machining runner yet, so this is a geometry-level API only.</li>
+<li><strong><a class="xref" href="../../api/Hi.Milling.FluteContours.FreeformBottomContour.html">FreeformBottomContour</a></strong> is the user-editable point-list bottom
+contour, mirroring the side contour with the key axis switched to radius.</li>
+</ul>
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