Rename mesh_assetpathadr to mesh_pathadr and move it to the end of the mesh section.

PiperOrigin-RevId: 568911603
Change-Id: I8f21c3d1cc9c73b6a95292a50f262b1a199d0898

src/engine/engine_io.c

@@ -1867,7 +1867,7 @@ const char* mj_validateReferences(const mjModel* m) {
   X(name_textadr,       ntext,         nnames       , 0                      ) \
   X(name_tupleadr,      ntuple,        nnames       , 0                      ) \
   X(name_keyadr,        nkey,          nnames       , 0                      ) \
-  X(mesh_assetpathadr,  nmesh,         npaths       , 0                      )
+  X(mesh_pathadr,       nmesh,         npaths       , 0                      )
 
   #define X(adrarray, nadrs, ntarget, numarray) {             \
     int *nums = (numarray);                                   \

src/user/user_model.cc

@@ -1332,10 +1332,10 @@ void mjCModel::CopyPaths(mjModel* m) {
 
   for (unsigned int i=0; i<meshes.size(); i++) {
     if (meshes[i]->file().empty()) {
-      m->mesh_assetpathadr[i] = -1;
+      m->mesh_pathadr[i] = -1;
       continue;
     }
-    m->mesh_assetpathadr[i] = adr;
+    m->mesh_pathadr[i] = adr;
 
     // copy path
     size_t path_size = meshes[i]->file().size();