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USD: Skeleton and blend shape import #110912

Merged
Michael Kowalski merged 38 commits from makowalski/blender:usdskel_import into main 2023-08-17 20:11:58 +02:00
Conversation 28 Commits 38 Files Changed 15 +29 -22
4 changed files with 29 additions and 22 deletions
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6
source/blender/io/usd/intern/usd_reader_mesh.cc
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@ -1144,8 +1144,10 @@ std::optional<XformResult> USDMeshReader::get_local_usd_xform(const float time)
if (skel_api.GetGeomBindTransformAttr().HasAuthoredValue()) {
pxr::GfMatrix4d bind_xf;
if (skel_api.GetGeomBindTransformAttr().Get(&bind_xf)) {
/* Assume that if a bind transform is defined, then the
* transform is constant. */
/* The USD bind transform is a matrix of doubles,
* but we cast it to GfMatrix4f because Blender expects
* a matrix of floats. Also, we assume the transform
* is constant over time. */
return XformResult(pxr::GfMatrix4f(bind_xf), true);
}
else {

2
source/blender/io/usd/intern/usd_reader_mesh.h
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@ -110,7 +110,7 @@ class USDMeshReader : public USDGeomReader {
* Override transform computation to account for the binding
* transformation for skinned meshes.
*/
std::optional<XformResult> get_local_usd_xform(const float time) const override;
std::optional<XformResult> get_local_usd_xform(float time) const override;
};
} // namespace blender::io::usd

39
source/blender/io/usd/intern/usd_reader_stage.cc
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@ -350,25 +350,28 @@ void USDStageReader::process_armature_modifiers() const
if (!reader->object()) {
continue;
}
if (const USDMeshReader *mesh_reader = dynamic_cast<const USDMeshReader *>(reader)) {
/* Check if the mesh object has an armature modifier. */
ModifierData *md = BKE_modifiers_findby_type(reader->object(), eModifierType_Armature);
if (!md) {
continue;
}
ArmatureModifierData *amd = reinterpret_cast<ArmatureModifierData *>(md);
/* Assign the armature based on the bound USD skeleton path of the skinned mesh. */
std::string skel_path = mesh_reader->get_skeleton_path();
std::map<std::string, Object *>::const_iterator it = usd_path_to_armature.find(skel_path);
if (it == usd_path_to_armature.end()) {
WM_reportf(RPT_WARNING,
"%s: Couldn't find armature object corresponding to USD skeleton %s",
__func__,
skel_path.c_str());
}
amd->object = it->second;
const USDMeshReader *mesh_reader = dynamic_cast<const USDMeshReader *>(reader);
if (!mesh_reader) {
continue;
}
/* Check if the mesh object has an armature modifier. */
ModifierData *md = BKE_modifiers_findby_type(reader->object(), eModifierType_Armature);
if (!md) {
continue;
}
ArmatureModifierData *amd = reinterpret_cast<ArmatureModifierData *>(md);
/* Assign the armature based on the bound USD skeleton path of the skinned mesh. */
std::string skel_path = mesh_reader->get_skeleton_path();
std::map<std::string, Object *>::const_iterator it = usd_path_to_armature.find(skel_path);
if (it == usd_path_to_armature.end()) {
WM_reportf(RPT_WARNING,
"%s: Couldn't find armature object corresponding to USD skeleton %s",
__func__,
skel_path.c_str());
}
amd->object = it->second;
}
}

4
source/blender/io/usd/intern/usd_reader_xform.h
View File

@ -12,6 +12,8 @@
namespace blender::io::usd {
/** A transformation matrix and a boolean indicating
* whether the matrix is constant over time. */
using XformResult = std::tuple<pxr::GfMatrix4f, bool>;
class USDXformReader : public USDPrimReader {
@ -63,7 +65,7 @@ class USDXformReader : public USDPrimReader {
* - A boolean flag indicating whether the matrix
* is constant over time.
*/
virtual std::optional<XformResult> get_local_usd_xform(const float time) const;
virtual std::optional<XformResult> get_local_usd_xform(float time) const;
};
} // namespace blender::io::usd