Fix precomputed mesh positions (#6588)

* fix precomputed mesh positions by scaling the whole group instead of each chunk on its own
* update changelog
* Merge branch 'master' into fix-mesh-positions
* Merge branch 'master' into fix-mesh-positions

CHANGELOG.unreleased.md

@@ -17,6 +17,7 @@ For upgrade instructions, please check the [migration guide](MIGRATIONS.released
 
 ### Fixed
 - Fixed a rare crash in newer Firefox versions. [#6561](https://github.com/scalableminds/webknossos/pull/6561)
+- Fixed the positions of precomputed meshes when using a v3 mesh file. [#6588](https://github.com/scalableminds/webknossos/pull/6588)
 
 ### Removed
 

frontend/javascripts/oxalis/controller/scene_controller.ts

@@ -270,6 +270,7 @@ class SceneController {
     segmentationId: number,
     passive: boolean = false,
     offset: Vector3 | null = null,
+    scale: Vector3 | null = null,
   ): void {
     if (this.isosurfacesGroupsPerSegmentationId[segmentationId] == null) {
       const newGroup = new THREE.Group();
@@ -279,6 +280,9 @@ class SceneController {
       newGroup.cellId = segmentationId;
       // @ts-ignore
       newGroup.passive = passive;
+      if (scale != null) {
+        newGroup.scale.copy(new THREE.Vector3(...scale));
+      }
     }
     const mesh = this.constructIsosurfaceMesh(segmentationId, geometry, passive);
     if (offset) {

frontend/javascripts/oxalis/model/sagas/isosurface_saga.ts

@@ -680,17 +680,15 @@ function* loadPrecomputedMeshForSegmentId(
           const geometry = yield* call(loader.decodeDracoFileAsync, dracoData);
           // Compute vertex normals to achieve smooth shading
           geometry.computeVertexNormals();
-          // Apply the scale from the segment info, which includes dataset scale and mag
-          if (scale != null) {
-            geometry.scale(...scale);
-          }
 
           yield* call(
             { context: sceneController, fn: sceneController.addIsosurfaceFromGeometry },
             geometry,
             id,
             false,
             chunk.position,
+            // Apply the scale from the segment info, which includes dataset scale and mag
+            scale,
           );
         } else {
           // V0