Blender  V3.3
file_reader.cpp
Go to the documentation of this file.
1 /* SPDX-License-Identifier: Apache-2.0
2  * Copyright 2011-2022 Blender Foundation */
3 
4 #include "hydra/file_reader.h"
5 #include "hydra/camera.h"
7 
8 #include "util/path.h"
9 #include "util/unique_ptr.h"
10 
11 #include "scene/scene.h"
12 
13 #include <pxr/base/plug/registry.h>
14 #include <pxr/imaging/hd/dirtyList.h>
15 #include <pxr/imaging/hd/renderDelegate.h>
16 #include <pxr/imaging/hd/renderIndex.h>
17 #include <pxr/imaging/hd/rprimCollection.h>
18 #include <pxr/imaging/hd/task.h>
19 #include <pxr/usd/usd/stage.h>
20 #include <pxr/usd/usdGeom/camera.h>
21 #include <pxr/usd/usdGeom/metrics.h>
22 #include <pxr/usdImaging/usdImaging/delegate.h>
23 
25 
26 /* Dummy task whose only purpose is to provide render tag tokens to the render index. */
27 class DummyHdTask : public HdTask {
28  public:
29  DummyHdTask(HdSceneDelegate *delegate, SdfPath const &id)
30  : HdTask(id), tags({HdRenderTagTokens->geometry, HdRenderTagTokens->render})
31  {
32  }
33 
34  protected:
35  void Sync(HdSceneDelegate *delegate, HdTaskContext *ctx, HdDirtyBits *dirtyBits) override
36  {
37  }
38 
39  void Prepare(HdTaskContext *ctx, HdRenderIndex *render_index) override
40  {
41  }
42 
43  void Execute(HdTaskContext *ctx) override
44  {
45  }
46 
47  const TfTokenVector &GetRenderTags() const override
48  {
49  return tags;
50  }
51 
52  TfTokenVector tags;
53 };
54 
55 void HdCyclesFileReader::read(Session *session, const char *filepath, const bool use_camera)
56 {
57  /* Initialize USD. */
58  PlugRegistry::GetInstance().RegisterPlugins(path_get("usd"));
59 
60  /* Open Stage. */
61  UsdStageRefPtr stage = UsdStage::Open(filepath);
62  if (!stage) {
63  fprintf(stderr, "%s read error\n", filepath);
64  return;
65  }
66 
67  /* Init paths. */
68  SdfPath root_path = SdfPath::AbsoluteRootPath();
69  SdfPath task_path("/_hdCycles/DummyHdTask");
70 
71  /* Create render delegate. */
72  HdRenderSettingsMap settings_map;
73  settings_map.insert(std::make_pair(HdCyclesRenderSettingsTokens->stageMetersPerUnit,
74  VtValue(UsdGeomGetStageMetersPerUnit(stage))));
75 
76  HdCyclesDelegate render_delegate(settings_map, session, true);
77 
78  /* Create render index and scene delegate. */
79  unique_ptr<HdRenderIndex> render_index(HdRenderIndex::New(&render_delegate, {}));
80  unique_ptr<UsdImagingDelegate> scene_delegate = make_unique<UsdImagingDelegate>(
81  render_index.get(), root_path);
82 
83  /* Add render tags and collection to render index. */
84  HdRprimCollection collection(HdTokens->geometry, HdReprSelector(HdReprTokens->smoothHull));
85  collection.SetRootPath(root_path);
86 
87  render_index->InsertTask<DummyHdTask>(scene_delegate.get(), task_path);
88 
89 #if PXR_VERSION < 2111
90  HdDirtyListSharedPtr dirty_list = std::make_shared<HdDirtyList>(collection,
91  *(render_index.get()));
92  render_index->EnqueuePrimsToSync(dirty_list, collection);
93 #else
94  render_index->EnqueueCollectionToSync(collection);
95 #endif
96 
97  /* Create prims. */
98  const UsdPrim &stage_root = stage->GetPseudoRoot();
99  scene_delegate->Populate(stage_root.GetStage()->GetPrimAtPath(root_path), {});
100 
101  /* Sync prims. */
102  HdTaskContext task_context;
103  HdTaskSharedPtrVector tasks;
104  tasks.push_back(render_index->GetTask(task_path));
105 
106  render_index->SyncAll(&tasks, &task_context);
107  render_delegate.CommitResources(&render_index->GetChangeTracker());
108 
109  /* Use first camera in stage.
110  * TODO: get camera from UsdRender if available. */
111  if (use_camera) {
112  for (UsdPrim const &prim : stage->Traverse()) {
113  if (prim.IsA<UsdGeomCamera>()) {
114  HdSprim *sprim = render_index->GetSprim(HdPrimTypeTokens->camera, prim.GetPath());
115  if (sprim) {
116  HdCyclesCamera *camera = dynamic_cast<HdCyclesCamera *>(sprim);
117  camera->ApplyCameraSettings(render_delegate.GetRenderParam(), session->scene->camera);
118  break;
119  }
120  }
121  }
122  }
123 }
124 
in reality light always falls off quadratically Particle Retrieve the data of the particle that spawned the object for example to give variation to multiple instances of an object Point Retrieve information about points in a point cloud Retrieve the edges of an object as it appears to Cycles topology will always appear triangulated Convert a blackbody temperature to an RGB value Normal Generate a perturbed normal from an RGB normal map image Typically used for faking highly detailed surfaces Generate an OSL shader from a file or text data block Image Sample an image file as a texture Sky Generate a procedural sky texture Noise Generate fractal Perlin noise Wave Generate procedural bands or rings with noise Voronoi Generate Worley noise based on the distance to random points Typically used to generate textures such as or biological cells Brick Generate a procedural texture producing bricks Texture Retrieve multiple types of texture coordinates nTypically used as inputs for texture nodes Vector Convert a or normal between camera
const TfTokenVector & GetRenderTags() const override
Definition: file_reader.cpp:47
void Sync(HdSceneDelegate *delegate, HdTaskContext *ctx, HdDirtyBits *dirtyBits) override
Definition: file_reader.cpp:35
void Execute(HdTaskContext *ctx) override
Definition: file_reader.cpp:43
void Prepare(HdTaskContext *ctx, HdRenderIndex *render_index) override
Definition: file_reader.cpp:39
TfTokenVector tags
Definition: file_reader.cpp:52
DummyHdTask(HdSceneDelegate *delegate, SdfPath const &id)
Definition: file_reader.cpp:29
PXR_NS::HdRenderParam * GetRenderParam() const override
void CommitResources(PXR_NS::HdChangeTracker *tracker) override
static void read(Session *session, const char *filepath, const bool use_camera=true)
Definition: file_reader.cpp:55
Scene * scene
EvaluationStage stage
Definition: deg_eval.cc:89
#define HDCYCLES_NAMESPACE_CLOSE_SCOPE
Definition: hydra/config.h:17
string path_get(const string &sub)
Definition: path.cpp:338
struct Object * camera