intern/cycles/blender/curves.cpp

@@ -334,7 +334,8 @@ static void ExportCurveSegments(Scene *scene, Hair *hair, ParticleCurveData *CDa
           attr_intercept->add(time);
 
         if (attr_normal) {
-          /* TODO: compute geometry normals. */
+          /* NOTE: the geometry normals are not computed for legacy particle hairs. This hair
+           * system is expected to be discarded. */
           attr_normal->add(make_float3(1.0f, 0.0f, 0.0f));
         }
 

source/blender/blenloader/intern/versioning_400.cc

@@ -687,6 +687,7 @@ void blo_do_versions_400(FileData *fd, Library * /*lib*/, Main *bmain)
    */
   {
     /* Keep this block, even when empty. */
+
     if (!DNA_struct_find(fd->filesdna, "NodeShaderHairPrincipled")) {
       FOREACH_NODETREE_BEGIN (bmain, ntree, id) {
         if (ntree->type == NTREE_SHADER) {