source/blender/render/hydra/final_engine.cc

@@ -246,13 +246,13 @@ void FinalEngineGL::render1(Depsgraph *depsgraph)
 {
   prepare_for_render(depsgraph);
 
-  //pxr::TraceCollector::GetInstance().SetEnabled(true);
+  // pxr::TraceCollector::GetInstance().SetEnabled(true);
 
   auto d = pxr::GlfDrawTarget::New(resolution_);
   d->Bind();
   d->AddAttachment("color", GL_RGBA, GL_FLOAT, GL_RGBA);
   engine_->Execute(render_index_.get(), &tasks_);
-  //d->Unbind();
+  // d->Unbind();
 
   std::vector<float> &pixels = render_images_["Combined"];
   char elapsed_time[32];
@@ -281,8 +281,8 @@ void FinalEngineGL::render1(Depsgraph *depsgraph)
 
   GLuint rendered_texture;
 
-  //glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, pixels.data());
+  // glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, pixels.data());
-  //update_render_result();
+  // update_render_result();
   pxr::TraceCollector::GetInstance().SetEnabled(false);
 }
 

source/blender/render/hydra/scene_delegate/blender_scene_delegate.cc

@@ -178,7 +178,7 @@ bool BlenderSceneDelegate::GetDoubleSided(pxr::SdfPath const &id)
 pxr::HdCullStyle BlenderSceneDelegate::GetCullStyle(pxr::SdfPath const &id)
 {
   CLOG_INFO(LOG_RENDER_HYDRA_SCENE, 3, "%s", id.GetText());
-  return mesh_data(id)->cull_style;
+  return mesh_data(id)->cull_style(id);
 }
 
 pxr::SdfPath BlenderSceneDelegate::GetInstancerId(pxr::SdfPath const &prim_id)

source/blender/render/hydra/scene_delegate/image.cc

@@ -45,7 +45,7 @@ static std::string cache_image_file(Image *image,
       BKE_image_path_ext_from_imformat(&scene->r.im_format, &r_ext);
       opts.im_format = scene->r.im_format;
     }
-    
+
     snprintf(file_name, sizeof(file_name), "img_%016llx%s", (uintptr_t)image, r_ext);
 
     file_path = get_cache_file(file_name);

source/blender/render/hydra/scene_delegate/material.cc

@@ -89,6 +89,11 @@ pxr::VtValue MaterialData::get_material_resource() const
   return material_network_map_;
 }
 
+pxr::HdCullStyle MaterialData::cull_style() const
+{
+  return double_sided ? pxr::HdCullStyle::HdCullStyleNothing : pxr::HdCullStyle::HdCullStyleBack;
+}
+
 void MaterialData::export_mtlx()
 {
   /* Call of python function hydra.export_mtlx() */

source/blender/render/hydra/scene_delegate/material.h

@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include "pxr/base/tf/hashmap.h"
+#include <pxr/imaging/hd/enums.h>
 #include <pxr/usd/sdf/assetPath.h>
 #include <pxr/usd/sdf/path.h>
 
@@ -27,6 +27,7 @@ class MaterialData : public IdData {
 
   pxr::VtValue get_data(pxr::TfToken const &key) const override;
   pxr::VtValue get_material_resource() const;
+  pxr::HdCullStyle cull_style() const;
 
   bool double_sided = true;
 

source/blender/render/hydra/scene_delegate/mesh.cc

@@ -149,6 +149,15 @@ pxr::SdfPath MeshData::material_id(pxr::SdfPath const &id) const
   return sm.mat_data->prim_id;
 }
 
+pxr::HdCullStyle MeshData::cull_style(pxr::SdfPath const &id) const
+{
+  const SubMesh &sm = submesh(id);
+  if (sm.mat_data) {
+    return sm.mat_data->cull_style();
+  }
+  return pxr::HdCullStyle::HdCullStyleDontCare;
+}
+
 bool MeshData::double_sided(pxr::SdfPath const &id) const
 {
   const SubMesh &sm = submesh(id);
@@ -163,7 +172,8 @@ void MeshData::update_double_sided(MaterialData *mat_data)
   for (int i = 0; i < submeshes_.size(); ++i) {
     if (submeshes_[i].mat_data == mat_data) {
       scene_delegate_->GetRenderIndex().GetChangeTracker().MarkRprimDirty(
-          submesh_prim_id(i), pxr::HdChangeTracker::DirtyDoubleSided);
+          submesh_prim_id(i),
+          pxr::HdChangeTracker::DirtyDoubleSided | pxr::HdChangeTracker::DirtyCullStyle);
       ID_LOG(1, "%d", i);
     }
   }

source/blender/render/hydra/scene_delegate/mesh.h

@@ -38,13 +38,12 @@ class MeshData : public ObjectData {
   pxr::HdMeshTopology mesh_topology(pxr::SdfPath const &id) const;
   pxr::HdPrimvarDescriptorVector primvar_descriptors(pxr::HdInterpolation interpolation) const;
   pxr::SdfPath material_id(pxr::SdfPath const &id) const;
+  pxr::HdCullStyle cull_style(pxr::SdfPath const &id) const;
   bool double_sided(pxr::SdfPath const &id) const;
   void update_double_sided(MaterialData *mat_data);
   void available_materials(Set<pxr::SdfPath> &paths) const;
   pxr::SdfPathVector submesh_paths() const;
 
-  pxr::HdCullStyle cull_style = pxr::HdCullStyleBack;
-
  private:
   pxr::SdfPath submesh_prim_id(int index) const;
   const SubMesh &submesh(pxr::SdfPath const &id) const;

source/blender/render/hydra/scene_delegate/world.cc

@@ -176,11 +176,8 @@ void WorldData::write_transform()
 {
   transform = pxr::GfMatrix4d(pxr::GfRotation(pxr::GfVec3d(1.0, 0.0, 0.0), -90), pxr::GfVec3d());
 
-  transform *= pxr::GfMatrix4d(pxr::GfRotation(pxr::GfVec3d(1.0, 0.0, 0.0), -180),
+  transform *= pxr::GfMatrix4d(pxr::GfRotation(pxr::GfVec3d(1.0, 0.0, 0.0), -180), pxr::GfVec3d());
-                                pxr::GfVec3d());
+  transform *= pxr::GfMatrix4d(pxr::GfRotation(pxr::GfVec3d(0.0, 0.0, 1.0), 90.0), pxr::GfVec3d());
-  transform *= pxr::GfMatrix4d(pxr::GfRotation(pxr::GfVec3d(0.0, 0.0, 1.0), 90.0),
-                                pxr::GfVec3d());
-
 }
 
 }  // namespace blender::render::hydra