source/blender/io/usd/intern/usd_capi_export.cc

@@ -215,6 +215,15 @@ static pxr::UsdStageRefPtr export_to_stage(const USDExportParams &params,
   Scene *scene = DEG_get_input_scene(depsgraph);
   Main *bmain = DEG_get_bmain(depsgraph);
 
+  /* This whole `export_to_stage` function is assumed to cover about 80% of the whole export
+   * process, from 0.1f to 0.9f. */
+  if (progress) {
+    *progress = 0.10f;
+  }
+  if (do_update) {
+    *do_update = true;
+  }
+
   usd_stage->SetMetadata(pxr::UsdGeomTokens->metersPerUnit, double(scene->unit.scale_length));
   usd_stage->GetRootLayer()->SetDocumentation(std::string("Blender v") +
                                               BKE_blender_version_string());
@@ -237,9 +246,16 @@ static pxr::UsdStageRefPtr export_to_stage(const USDExportParams &params,
 
   USDHierarchyIterator iter(bmain, depsgraph, usd_stage, params);
 
+  if (progress) {
+    *progress = 0.11f;
+  }
+  if (do_update) {
+    *do_update = true;
+  }
+
   if (params.export_animation) {
-    /* Writing the animated frames is not 100% of the work, but it's our best guess. */
-    float progress_per_frame = 1.0f / std::max(1, (scene->r.efra - scene->r.sfra + 1));
+    /* Writing the animated frames is not 100% of the work, here it's assumed to be 75% of it. */
+    float progress_per_frame = 0.75f / std::max(1, (scene->r.efra - scene->r.sfra + 1));
 
     for (float frame = scene->r.sfra; frame <= scene->r.efra; frame++) {
       if (G.is_break || (stop != nullptr && *stop)) {
@@ -267,6 +283,13 @@ static pxr::UsdStageRefPtr export_to_stage(const USDExportParams &params,
     iter.iterate_and_write();
   }
 
+  if (progress) {
+    *progress = 0.86f;
+  }
+  if (do_update) {
+    *do_update = true;
+  }
+
   iter.release_writers();
 
   /* Set the default prim if it doesn't exist */
@@ -281,12 +304,26 @@ static pxr::UsdStageRefPtr export_to_stage(const USDExportParams &params,
 
   call_export_hooks(usd_stage, depsgraph);
 
+  if (progress) {
+    *progress = 0.88f;
+  }
+  if (do_update) {
+    *do_update = true;
+  }
+
   /* Finish up by going back to the keyframe that was current before we started. */
   if (scene->r.cfra != orig_frame) {
     scene->r.cfra = orig_frame;
     BKE_scene_graph_update_for_newframe(depsgraph);
   }
 
+  if (progress) {
+    *progress = 0.9f;
+  }
+  if (do_update) {
+    *do_update = true;
+  }
+
   return usd_stage;
 }
 
@@ -314,6 +351,9 @@ static void export_startjob(void *customdata,
   }
   G.is_break = false;
 
+  *progress = 0.01f;
+  *do_update = true;
+
   /* Evaluate the despgraph for exporting.
    *
    * Note that, unlike with its building, this is expected to be safe to perform from worker
@@ -323,7 +363,7 @@ static void export_startjob(void *customdata,
    * #USD_export. */
   BKE_scene_graph_update_tagged(data->depsgraph, data->bmain);
 
-  *progress = 0.0f;
+  *progress = 0.1f;
   *do_update = true;
 
   pxr::UsdStageRefPtr usd_stage = export_to_stage(
@@ -340,6 +380,9 @@ static void export_startjob(void *customdata,
 
   usd_stage->GetRootLayer()->Save();
 
+  *progress = 0.98f;
+  *do_update = true;
+
   if (data->targets_usdz()) {
     bool usd_conversion_success = perform_usdz_conversion(data);
     if (!usd_conversion_success) {