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test/source/blender/io/usd/intern/usd_reader_mesh.cc
Hans Goudey 976eaae02f Cleanup: Move BKE_object.hh to C++ 
Simplifies the fix to #111120, where the object bounds functions
may return a C++ type instead of `BoundBox`.

Pull Request: https://projects.blender.org/blender/blender/pulls/113462
2023-10-09 23:41:53 +02:00

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/* SPDX-FileCopyrightText: 2023 Blender Authors
*
* SPDX-License-Identifier: GPL-2.0-or-later
* Adapted from the Blender Alembic importer implementation.
* Modifications Copyright 2021 Tangent Animation and
* NVIDIA Corporation. All rights reserved. */
#include "usd_reader_mesh.h"
#include "usd_reader_material.h"
#include "usd_skel_convert.h"
#include "BKE_attribute.hh"
#include "BKE_customdata.h"
#include "BKE_main.h"
#include "BKE_material.h"
#include "BKE_mesh.hh"
#include "BKE_object.hh"
#include "BLI_math_color.hh"
#include "BLI_math_geom.h"
#include "BLI_math_vector_types.hh"
#include "BLI_span.hh"
#include "BLI_string.h"
#include "usd_hash_types.h"
#include "DNA_customdata_types.h"
#include "DNA_material_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "DNA_windowmanager_types.h"
#include "WM_api.hh"
#include "MEM_guardedalloc.h"
#include <pxr/base/vt/array.h>
#include <pxr/base/vt/types.h>
#include <pxr/base/vt/value.h>
#include <pxr/usd/sdf/types.h>
#include <pxr/usd/usdGeom/mesh.h>
#include <pxr/usd/usdGeom/primvarsAPI.h>
#include <pxr/usd/usdGeom/subset.h>
#include <pxr/usd/usdShade/materialBindingAPI.h>
#include <pxr/usd/usdSkel/bindingAPI.h>
#include <iostream>
namespace usdtokens {
/* Materials */
static const pxr::TfToken st("st", pxr::TfToken::Immortal);
static const pxr::TfToken UVMap("UVMap", pxr::TfToken::Immortal);
static const pxr::TfToken Cd("Cd", pxr::TfToken::Immortal);
static const pxr::TfToken displayColor("displayColor", pxr::TfToken::Immortal);
static const pxr::TfToken normalsPrimvar("normals", pxr::TfToken::Immortal);
} // namespace usdtokens
namespace utils {
static pxr::UsdShadeMaterial compute_bound_material(const pxr::UsdPrim &prim)
{
pxr::UsdShadeMaterialBindingAPI api = pxr::UsdShadeMaterialBindingAPI(prim);
/* Compute generically bound ('allPurpose') materials. */
pxr::UsdShadeMaterial mtl = api.ComputeBoundMaterial();
/* If no generic material could be resolved, also check for 'preview' and
* 'full' purpose materials as fallbacks. */
if (!mtl) {
mtl = api.ComputeBoundMaterial(pxr::UsdShadeTokens->preview);
}
if (!mtl) {
mtl = api.ComputeBoundMaterial(pxr::UsdShadeTokens->full);
}
return mtl;
}
static void assign_materials(Main *bmain,
Object *ob,
const std::map<pxr::SdfPath, int> &mat_index_map,
const USDImportParams &params,
pxr::UsdStageRefPtr stage,
std::map<std::string, Material *> &mat_name_to_mat,
std::map<std::string, std::string> &usd_path_to_mat_name)
{
if (!(stage && bmain && ob)) {
return;
}
if (mat_index_map.size() > MAXMAT) {
return;
}
blender::io::usd::USDMaterialReader mat_reader(params, bmain);
for (std::map<pxr::SdfPath, int>::const_iterator it = mat_index_map.begin();
it != mat_index_map.end();
++it)
{
Material *assigned_mat = blender::io::usd::find_existing_material(
it->first, params, mat_name_to_mat, usd_path_to_mat_name);
if (!assigned_mat) {
/* Blender material doesn't exist, so create it now. */
/* Look up the USD material. */
pxr::UsdPrim prim = stage->GetPrimAtPath(it->first);
pxr::UsdShadeMaterial usd_mat(prim);
if (!usd_mat) {
std::cout << "WARNING: Couldn't construct USD material from prim " << it->first
<< std::endl;
continue;
}
/* Add the Blender material. */
assigned_mat = mat_reader.add_material(usd_mat);
if (!assigned_mat) {
std::cout << "WARNING: Couldn't create Blender material from USD material " << it->first
<< std::endl;
continue;
}
const std::string mat_name = pxr::TfMakeValidIdentifier(assigned_mat->id.name + 2);
mat_name_to_mat[mat_name] = assigned_mat;
if (params.mtl_name_collision_mode == USD_MTL_NAME_COLLISION_MAKE_UNIQUE) {
/* Record the name of the Blender material we created for the USD material
* with the given path. */
usd_path_to_mat_name[it->first.GetAsString()] = mat_name;
}
}
if (assigned_mat) {
BKE_object_material_assign_single_obdata(bmain, ob, assigned_mat, it->second);
}
else {
/* This shouldn't happen. */
std::cout << "WARNING: Couldn't assign material " << it->first << std::endl;
}
}
if (ob->totcol > 0) {
ob->actcol = 1;
}
}
} // namespace utils
namespace blender::io::usd {
USDMeshReader::USDMeshReader(const pxr::UsdPrim &prim,
const USDImportParams &import_params,
const ImportSettings &settings)
: USDGeomReader(prim, import_params, settings),
mesh_prim_(prim),
is_left_handed_(false),
is_time_varying_(false),
is_initial_load_(false)
{
}
static std::optional<eCustomDataType> convert_usd_type_to_blender(
const pxr::SdfValueTypeName usd_type)
{
static const blender::Map<pxr::SdfValueTypeName, eCustomDataType> type_map = []() {
blender::Map<pxr::SdfValueTypeName, eCustomDataType> map;
map.add_new(pxr::SdfValueTypeNames->FloatArray, CD_PROP_FLOAT);
map.add_new(pxr::SdfValueTypeNames->Double, CD_PROP_FLOAT);
map.add_new(pxr::SdfValueTypeNames->IntArray, CD_PROP_INT32);
map.add_new(pxr::SdfValueTypeNames->Float2Array, CD_PROP_FLOAT2);
map.add_new(pxr::SdfValueTypeNames->TexCoord2dArray, CD_PROP_FLOAT2);
map.add_new(pxr::SdfValueTypeNames->TexCoord2fArray, CD_PROP_FLOAT2);
map.add_new(pxr::SdfValueTypeNames->TexCoord2hArray, CD_PROP_FLOAT2);
map.add_new(pxr::SdfValueTypeNames->TexCoord3dArray, CD_PROP_FLOAT2);
map.add_new(pxr::SdfValueTypeNames->TexCoord3fArray, CD_PROP_FLOAT2);
map.add_new(pxr::SdfValueTypeNames->TexCoord3hArray, CD_PROP_FLOAT2);
map.add_new(pxr::SdfValueTypeNames->Float3Array, CD_PROP_FLOAT3);
map.add_new(pxr::SdfValueTypeNames->Vector3fArray, CD_PROP_FLOAT3);
map.add_new(pxr::SdfValueTypeNames->Vector3hArray, CD_PROP_FLOAT3);
map.add_new(pxr::SdfValueTypeNames->Vector3dArray, CD_PROP_FLOAT3);
map.add_new(pxr::SdfValueTypeNames->Color3fArray, CD_PROP_COLOR);
map.add_new(pxr::SdfValueTypeNames->Color3hArray, CD_PROP_COLOR);
map.add_new(pxr::SdfValueTypeNames->Color3dArray, CD_PROP_COLOR);
map.add_new(pxr::SdfValueTypeNames->StringArray, CD_PROP_STRING);
map.add_new(pxr::SdfValueTypeNames->BoolArray, CD_PROP_BOOL);
map.add_new(pxr::SdfValueTypeNames->QuatfArray, CD_PROP_QUATERNION);
return map;
}();
const eCustomDataType *value = type_map.lookup_ptr(usd_type);
if (value == nullptr) {
WM_reportf(RPT_WARNING, "Unsupported type %s for mesh data", usd_type.GetAsToken().GetText());
return std::nullopt;
}
return *value;
}
static const std::optional<eAttrDomain> convert_usd_varying_to_blender(
const pxr::TfToken usd_domain)
{
static const blender::Map<pxr::TfToken, eAttrDomain> domain_map = []() {
blender::Map<pxr::TfToken, eAttrDomain> map;
map.add_new(pxr::UsdGeomTokens->faceVarying, ATTR_DOMAIN_CORNER);
map.add_new(pxr::UsdGeomTokens->vertex, ATTR_DOMAIN_POINT);
map.add_new(pxr::UsdGeomTokens->varying, ATTR_DOMAIN_POINT);
map.add_new(pxr::UsdGeomTokens->face, ATTR_DOMAIN_FACE);
/* As there's no "constant" type in Blender, for now we're
* translating into a point Attribute. */
map.add_new(pxr::UsdGeomTokens->constant, ATTR_DOMAIN_POINT);
map.add_new(pxr::UsdGeomTokens->uniform, ATTR_DOMAIN_FACE);
/* Notice: Edge types are not supported! */
return map;
}();
const eAttrDomain *value = domain_map.lookup_ptr(usd_domain);
if (value == nullptr) {
WM_reportf(RPT_WARNING, "Unsupported domain for mesh data type %s", usd_domain.GetText());
return std::nullopt;
}
return *value;
}
void USDMeshReader::create_object(Main *bmain, const double /*motionSampleTime*/)
{
Mesh *mesh = BKE_mesh_add(bmain, name_.c_str());
object_ = BKE_object_add_only_object(bmain, OB_MESH, name_.c_str());
object_->data = mesh;
}
void USDMeshReader::read_object_data(Main *bmain, const double motionSampleTime)
{
Mesh *mesh = (Mesh *)object_->data;
is_initial_load_ = true;
const USDMeshReadParams params = create_mesh_read_params(motionSampleTime,
import_params_.mesh_read_flag);
Mesh *read_mesh = this->read_mesh(mesh, params, nullptr);
is_initial_load_ = false;
if (read_mesh != mesh) {
BKE_mesh_nomain_to_mesh(read_mesh, mesh, object_);
}
readFaceSetsSample(bmain, mesh, motionSampleTime);
if (mesh_prim_.GetPointsAttr().ValueMightBeTimeVarying()) {
is_time_varying_ = true;
}
if (is_time_varying_) {
add_cache_modifier();
}
if (import_params_.import_subdiv) {
pxr::TfToken subdivScheme;
mesh_prim_.GetSubdivisionSchemeAttr().Get(&subdivScheme, motionSampleTime);
if (subdivScheme == pxr::UsdGeomTokens->catmullClark) {
add_subdiv_modifier();
}
}
if (import_params_.import_blendshapes) {
import_blendshapes(bmain, object_, prim_);
}
if (import_params_.import_skeletons) {
import_mesh_skel_bindings(bmain, object_, prim_);
}
USDXformReader::read_object_data(bmain, motionSampleTime);
} // namespace blender::io::usd
bool USDMeshReader::valid() const
{
return bool(mesh_prim_);
}
bool USDMeshReader::topology_changed(const Mesh *existing_mesh, const double motionSampleTime)
{
/* TODO(makowalski): Is it the best strategy to cache the mesh
* geometry in this function? This needs to be revisited. */
mesh_prim_.GetFaceVertexIndicesAttr().Get(&face_indices_, motionSampleTime);
mesh_prim_.GetFaceVertexCountsAttr().Get(&face_counts_, motionSampleTime);
mesh_prim_.GetPointsAttr().Get(&positions_, motionSampleTime);
pxr::UsdGeomPrimvarsAPI primvarsAPI(mesh_prim_);
/* TODO(makowalski): Reading normals probably doesn't belong in this function,
* as this is not required to determine if the topology has changed. */
/* If 'normals' and 'primvars:normals' are both specified, the latter has precedence. */
pxr::UsdGeomPrimvar primvar = primvarsAPI.GetPrimvar(usdtokens::normalsPrimvar);
if (primvar.HasValue()) {
primvar.ComputeFlattened(&normals_, motionSampleTime);
normal_interpolation_ = primvar.GetInterpolation();
}
else {
mesh_prim_.GetNormalsAttr().Get(&normals_, motionSampleTime);
normal_interpolation_ = mesh_prim_.GetNormalsInterpolation();
}
return positions_.size() != existing_mesh->totvert ||
face_counts_.size() != existing_mesh->faces_num ||
face_indices_.size() != existing_mesh->totloop;
}
void USDMeshReader::read_mpolys(Mesh *mesh)
{
MutableSpan<int> face_offsets = mesh->face_offsets_for_write();
MutableSpan<int> corner_verts = mesh->corner_verts_for_write();
int loop_index = 0;
for (int i = 0; i < face_counts_.size(); i++) {
const int face_size = face_counts_[i];
face_offsets[i] = loop_index;
/* Polygons are always assumed to be smooth-shaded. If the mesh should be flat-shaded,
* this is encoded in custom loop normals. */
if (is_left_handed_) {
int loop_end_index = loop_index + (face_size - 1);
for (int f = 0; f < face_size; ++f, ++loop_index) {
corner_verts[loop_index] = face_indices_[loop_end_index - f];
}
}
else {
for (int f = 0; f < face_size; ++f, ++loop_index) {
corner_verts[loop_index] = face_indices_[loop_index];
}
}
}
BKE_mesh_calc_edges(mesh, false, false);
}
template<typename T>
pxr::VtArray<T> get_prim_attribute_array(const pxr::UsdGeomPrimvar &primvar,
const double motionSampleTime)
{
pxr::VtArray<T> array;
pxr::VtValue primvar_val;
if (!primvar.ComputeFlattened(&primvar_val, motionSampleTime)) {
WM_reportf(
RPT_WARNING, "Unable to get array values for primvar %s", primvar.GetName().GetText());
return array;
}
if (!primvar_val.CanCast<pxr::VtArray<T>>()) {
WM_reportf(RPT_WARNING,
"USD Import: can't cast attribute '%s' to array",
primvar.GetName().GetText());
return array;
}
array = primvar_val.Cast<pxr::VtArray<T>>().template UncheckedGet<pxr::VtArray<T>>();
return array;
}
void USDMeshReader::read_color_data_primvar(Mesh *mesh,
const pxr::UsdGeomPrimvar &primvar,
const double motionSampleTime)
{
if (!(mesh && primvar && primvar.HasValue())) {
return;
}
pxr::VtArray<pxr::GfVec3f> usd_colors = get_prim_attribute_array<pxr::GfVec3f>(primvar,
motionSampleTime);
if (usd_colors.empty()) {
return;
}
pxr::TfToken interp = primvar.GetInterpolation();
if ((interp == pxr::UsdGeomTokens->faceVarying && usd_colors.size() != mesh->totloop) ||
(interp == pxr::UsdGeomTokens->varying && usd_colors.size() != mesh->totloop) ||
(interp == pxr::UsdGeomTokens->vertex && usd_colors.size() != mesh->totvert) ||
(interp == pxr::UsdGeomTokens->constant && usd_colors.size() != 1) ||
(interp == pxr::UsdGeomTokens->uniform && usd_colors.size() != mesh->faces_num))
{
WM_reportf(RPT_WARNING,
"USD Import: color attribute value '%s' count inconsistent with interpolation type",
primvar.GetName().GetText());
return;
}
const StringRef primvar_name(primvar.GetBaseName().GetString());
bke::MutableAttributeAccessor attributes = mesh->attributes_for_write();
eAttrDomain color_domain = ATTR_DOMAIN_POINT;
if (ELEM(interp,
pxr::UsdGeomTokens->varying,
pxr::UsdGeomTokens->faceVarying,
pxr::UsdGeomTokens->uniform))
{
color_domain = ATTR_DOMAIN_CORNER;
}
bke::SpanAttributeWriter<ColorGeometry4f> color_data;
color_data = attributes.lookup_or_add_for_write_only_span<ColorGeometry4f>(primvar_name,
color_domain);
if (!color_data) {
WM_reportf(RPT_WARNING,
"USD Import: couldn't add color attribute '%s'",
primvar.GetBaseName().GetText());
return;
}
if (ELEM(interp, pxr::UsdGeomTokens->constant)) {
/* For situations where there's only a single item, flood fill the object. */
color_data.span.fill(
ColorGeometry4f(usd_colors[0][0], usd_colors[0][1], usd_colors[0][2], 1.0f));
}
/* Check for situations that allow for a straight-forward copy by index. */
else if (interp == pxr::UsdGeomTokens->vertex ||
(interp == pxr::UsdGeomTokens->faceVarying && !is_left_handed_))
{
for (int i = 0; i < usd_colors.size(); i++) {
ColorGeometry4f color = ColorGeometry4f(
usd_colors[i][0], usd_colors[i][1], usd_colors[i][2], 1.0f);
color_data.span[i] = color;
}
}
else {
/* Catch all for the remaining cases. */
/* Special case: we will expand uniform color into corner color.
* Uniforms in USD come through as single colors, face-varying. Since Blender does not
* support this particular combination for paintable color attributes, we convert the type
* here to make sure that the user gets the same visual result.
*/
const OffsetIndices faces = mesh->faces();
const Span<int> corner_verts = mesh->corner_verts();
for (const int i : faces.index_range()) {
const IndexRange &face = faces[i];
for (int j = 0; j < face.size(); ++j) {
int loop_index = face[j];
/* Default for constant interpolation. */
int usd_index = 0;
if (interp == pxr::UsdGeomTokens->vertex) {
usd_index = corner_verts[loop_index];
}
else if (interp == pxr::UsdGeomTokens->faceVarying) {
usd_index = face.start();
if (is_left_handed_) {
usd_index += face.size() - 1 - j;
}
else {
usd_index += j;
}
}
else if (interp == pxr::UsdGeomTokens->uniform) {
/* Uniform varying uses the face index. */
usd_index = i;
}
if (usd_index >= usd_colors.size()) {
continue;
}
ColorGeometry4f color = ColorGeometry4f(
usd_colors[usd_index][0], usd_colors[usd_index][1], usd_colors[usd_index][2], 1.0f);
color_data.span[loop_index] = color;
}
}
}
color_data.finish();
}
void USDMeshReader::read_uv_data_primvar(Mesh *mesh,
const pxr::UsdGeomPrimvar &primvar,
const double motionSampleTime)
{
const StringRef primvar_name(primvar.StripPrimvarsName(primvar.GetName()).GetString());
pxr::VtArray<pxr::GfVec2f> usd_uvs = get_prim_attribute_array<pxr::GfVec2f>(primvar,
motionSampleTime);
if (usd_uvs.empty()) {
return;
}
const pxr::TfToken varying_type = primvar.GetInterpolation();
BLI_assert(ELEM(varying_type,
pxr::UsdGeomTokens->vertex,
pxr::UsdGeomTokens->faceVarying,
pxr::UsdGeomTokens->varying));
if ((varying_type == pxr::UsdGeomTokens->faceVarying && usd_uvs.size() != mesh->totloop) ||
(varying_type == pxr::UsdGeomTokens->vertex && usd_uvs.size() != mesh->totvert) ||
(varying_type == pxr::UsdGeomTokens->varying && usd_uvs.size() != mesh->totloop))
{
WM_reportf(RPT_WARNING,
"USD Import: UV attribute value '%s' count inconsistent with interpolation type",
primvar.GetName().GetText());
return;
}
bke::MutableAttributeAccessor attributes = mesh->attributes_for_write();
bke::SpanAttributeWriter<float2> uv_data = attributes.lookup_or_add_for_write_only_span<float2>(
primvar_name, ATTR_DOMAIN_CORNER);
if (!uv_data) {
WM_reportf(RPT_WARNING,
"USD Import: couldn't add UV attribute '%s'",
primvar.GetBaseName().GetText());
return;
}
if (ELEM(varying_type, pxr::UsdGeomTokens->faceVarying, pxr::UsdGeomTokens->varying)) {
if (is_left_handed_) {
/* Reverse the index order. */
const OffsetIndices faces = mesh->faces();
for (const int i : faces.index_range()) {
const IndexRange face = faces[i];
for (int j : face.index_range()) {
const int rev_index = face.last(j);
uv_data.span[face.start() + j] = float2(usd_uvs[rev_index][0], usd_uvs[rev_index][1]);
}
}
}
else {
for (int i = 0; i < uv_data.span.size(); ++i) {
uv_data.span[i] = float2(usd_uvs[i][0], usd_uvs[i][1]);
}
}
}
else {
/* Handle vertex interpolation. */
const Span<int> corner_verts = mesh->corner_verts();
BLI_assert(mesh->totvert == usd_uvs.size());
for (int i = 0; i < uv_data.span.size(); ++i) {
/* Get the vertex index for this corner. */
int vi = corner_verts[i];
uv_data.span[i] = float2(usd_uvs[vi][0], usd_uvs[vi][1]);
}
}
uv_data.finish();
}
template<typename USDT, typename BlenderT> inline BlenderT convert_value(const USDT &value)
{
/* Default is no conversion. */
return value;
}
template<> inline float2 convert_value(const pxr::GfVec2f &value)
{
return float2(value[0], value[1]);
}
template<> inline float3 convert_value(const pxr::GfVec3f &value)
{
return float3(value[0], value[1], value[2]);
}
template<> inline ColorGeometry4f convert_value(const pxr::GfVec3f &value)
{
return ColorGeometry4f(value[0], value[1], value[2], 1.0f);
}
template<typename USDT, typename BlenderT>
void USDMeshReader::copy_prim_array_to_blender_attribute(const Mesh *mesh,
const pxr::UsdGeomPrimvar &primvar,
const double motionSampleTime,
MutableSpan<BlenderT> attribute)
{
const pxr::TfToken interp = primvar.GetInterpolation();
pxr::VtArray<USDT> primvar_array = get_prim_attribute_array<USDT>(primvar, motionSampleTime);
if (primvar_array.empty()) {
WM_reportf(
RPT_WARNING, "Unable to get array values for primvar %s", primvar.GetName().GetText());
return;
}
if (interp == pxr::UsdGeomTokens->constant) {
/* For situations where there's only a single item, flood fill the object. */
attribute.fill(convert_value<USDT, BlenderT>(primvar_array[0]));
}
else if (interp == pxr::UsdGeomTokens->faceVarying) {
if (is_left_handed_) {
/* Reverse the index order. */
const OffsetIndices faces = mesh->faces();
for (const int i : faces.index_range()) {
const IndexRange face = faces[i];
for (int j : face.index_range()) {
const int rev_index = face.last(j);
attribute[face.start() + j] = convert_value<USDT, BlenderT>(primvar_array[rev_index]);
}
}
}
else {
for (const int64_t i : attribute.index_range()) {
attribute[i] = convert_value<USDT, BlenderT>(primvar_array[i]);
}
}
}
else {
/* Assume direct one-to-one mapping. */
if (primvar_array.size() == attribute.size()) {
if constexpr (std::is_same_v<USDT, BlenderT>) {
const Span<USDT> src(primvar_array.data(), primvar_array.size());
attribute.copy_from(src);
}
else {
for (const int64_t i : attribute.index_range()) {
attribute[i] = convert_value<USDT, BlenderT>(primvar_array[i]);
}
}
}
}
}
void USDMeshReader::read_generic_data_primvar(Mesh *mesh,
const pxr::UsdGeomPrimvar &primvar,
const double motionSampleTime)
{
const pxr::SdfValueTypeName sdf_type = primvar.GetTypeName();
const pxr::TfToken varying_type = primvar.GetInterpolation();
const pxr::TfToken name = pxr::UsdGeomPrimvar::StripPrimvarsName(primvar.GetPrimvarName());
const std::optional<eAttrDomain> domain = convert_usd_varying_to_blender(varying_type);
const std::optional<eCustomDataType> type = convert_usd_type_to_blender(sdf_type);
if (!domain.has_value() || !type.has_value()) {
return;
}
bke::MutableAttributeAccessor attributes = mesh->attributes_for_write();
bke::GSpanAttributeWriter attribute = attributes.lookup_or_add_for_write_span(
name.GetText(), *domain, *type);
switch (*type) {
case CD_PROP_FLOAT:
copy_prim_array_to_blender_attribute<float>(
mesh, primvar, motionSampleTime, attribute.span.typed<float>());
break;
case CD_PROP_INT32:
copy_prim_array_to_blender_attribute<int32_t>(
mesh, primvar, motionSampleTime, attribute.span.typed<int>());
break;
case CD_PROP_FLOAT2:
copy_prim_array_to_blender_attribute<pxr::GfVec2f>(
mesh, primvar, motionSampleTime, attribute.span.typed<float2>());
break;
case CD_PROP_FLOAT3:
copy_prim_array_to_blender_attribute<pxr::GfVec3f>(
mesh, primvar, motionSampleTime, attribute.span.typed<float3>());
break;
case CD_PROP_COLOR:
copy_prim_array_to_blender_attribute<pxr::GfVec3f>(
mesh, primvar, motionSampleTime, attribute.span.typed<ColorGeometry4f>());
break;
case CD_PROP_BOOL:
copy_prim_array_to_blender_attribute<bool>(
mesh, primvar, motionSampleTime, attribute.span.typed<bool>());
break;
default:
WM_reportf(RPT_ERROR,
"Generic primvar %s: invalid type %s",
primvar.GetName().GetText(),
sdf_type.GetAsToken().GetText());
break;
}
attribute.finish();
}
void USDMeshReader::read_vertex_creases(Mesh *mesh, const double motionSampleTime)
{
pxr::VtIntArray corner_indices;
if (!mesh_prim_.GetCornerIndicesAttr().Get(&corner_indices, motionSampleTime)) {
return;
}
pxr::VtIntArray corner_sharpnesses;
if (!mesh_prim_.GetCornerSharpnessesAttr().Get(&corner_sharpnesses, motionSampleTime)) {
return;
}
/* It is fine to have fewer indices than vertices, but never the other way other. */
if (corner_indices.size() > mesh->totvert) {
std::cerr << "WARNING: too many vertex crease for mesh " << prim_path_ << std::endl;
return;
}
if (corner_indices.size() != corner_sharpnesses.size()) {
std::cerr << "WARNING: vertex crease indices and sharpnesses count mismatch for mesh "
<< prim_path_ << std::endl;
return;
}
bke::MutableAttributeAccessor attributes = mesh->attributes_for_write();
bke::SpanAttributeWriter creases = attributes.lookup_or_add_for_write_span<float>(
"crease_vert", ATTR_DOMAIN_POINT);
for (size_t i = 0; i < corner_indices.size(); i++) {
creases.span[corner_indices[i]] = corner_sharpnesses[i];
}
creases.finish();
}
void USDMeshReader::process_normals_vertex_varying(Mesh *mesh)
{
if (!mesh) {
return;
}
if (normals_.empty()) {
return;
}
if (normals_.size() != mesh->totvert) {
std::cerr << "WARNING: vertex varying normals count mismatch for mesh " << prim_path_
<< std::endl;
return;
}
BLI_STATIC_ASSERT(sizeof(normals_[0]) == sizeof(float3), "Expected float3 normals size");
bke::mesh_vert_normals_assign(
*mesh, Span(reinterpret_cast<const float3 *>(normals_.data()), int64_t(normals_.size())));
}
void USDMeshReader::process_normals_face_varying(Mesh *mesh)
{
if (normals_.empty()) {
return;
}
/* Check for normals count mismatches to prevent crashes. */
if (normals_.size() != mesh->totloop) {
std::cerr << "WARNING: loop normal count mismatch for mesh " << mesh->id.name << std::endl;
return;
}
mesh->flag |= ME_AUTOSMOOTH;
long int loop_count = normals_.size();
float(*lnors)[3] = static_cast<float(*)[3]>(
MEM_malloc_arrayN(loop_count, sizeof(float[3]), "USD::FaceNormals"));
const OffsetIndices faces = mesh->faces();
for (const int i : faces.index_range()) {
const IndexRange face = faces[i];
for (int j : face.index_range()) {
int blender_index = face.start() + j;
int usd_index = face.start();
if (is_left_handed_) {
usd_index += face.size() - 1 - j;
}
else {
usd_index += j;
}
lnors[blender_index][0] = normals_[usd_index][0];
lnors[blender_index][1] = normals_[usd_index][1];
lnors[blender_index][2] = normals_[usd_index][2];
}
}
BKE_mesh_set_custom_normals(mesh, lnors);
MEM_freeN(lnors);
}
void USDMeshReader::process_normals_uniform(Mesh *mesh)
{
if (normals_.empty()) {
return;
}
/* Check for normals count mismatches to prevent crashes. */
if (normals_.size() != mesh->faces_num) {
std::cerr << "WARNING: uniform normal count mismatch for mesh " << mesh->id.name << std::endl;
return;
}
float(*lnors)[3] = static_cast<float(*)[3]>(
MEM_malloc_arrayN(mesh->totloop, sizeof(float[3]), "USD::FaceNormals"));
const OffsetIndices faces = mesh->faces();
for (const int i : faces.index_range()) {
for (const int corner : faces[i]) {
lnors[corner][0] = normals_[i][0];
lnors[corner][1] = normals_[i][1];
lnors[corner][2] = normals_[i][2];
}
}
mesh->flag |= ME_AUTOSMOOTH;
BKE_mesh_set_custom_normals(mesh, lnors);
MEM_freeN(lnors);
}
void USDMeshReader::read_mesh_sample(ImportSettings *settings,
Mesh *mesh,
const double motionSampleTime,
const bool new_mesh)
{
/* Note that for new meshes we always want to read verts and faces,
* regardless of the value of the read_flag, to avoid a crash downstream
* in code that expect this data to be there. */
if (new_mesh || (settings->read_flag & MOD_MESHSEQ_READ_VERT) != 0) {
MutableSpan<float3> vert_positions = mesh->vert_positions_for_write();
for (int i = 0; i < positions_.size(); i++) {
vert_positions[i] = {positions_[i][0], positions_[i][1], positions_[i][2]};
}
BKE_mesh_tag_positions_changed(mesh);
read_vertex_creases(mesh, motionSampleTime);
}
if (new_mesh || (settings->read_flag & MOD_MESHSEQ_READ_POLY) != 0) {
read_mpolys(mesh);
if (normal_interpolation_ == pxr::UsdGeomTokens->faceVarying) {
process_normals_face_varying(mesh);
}
else if (normal_interpolation_ == pxr::UsdGeomTokens->uniform) {
process_normals_uniform(mesh);
}
}
/* Process point normals after reading faces. */
if ((settings->read_flag & MOD_MESHSEQ_READ_VERT) != 0 &&
normal_interpolation_ == pxr::UsdGeomTokens->vertex)
{
process_normals_vertex_varying(mesh);
}
/* Custom Data layers. */
if ((settings->read_flag & MOD_MESHSEQ_READ_VERT) ||
(settings->read_flag & MOD_MESHSEQ_READ_COLOR) ||
(settings->read_flag & MOD_MESHSEQ_READ_ATTRIBUTES))
{
read_custom_data(settings, mesh, motionSampleTime, new_mesh);
}
}
void USDMeshReader::read_custom_data(const ImportSettings *settings,
Mesh *mesh,
const double motionSampleTime,
const bool new_mesh)
{
if (!(mesh && mesh_prim_ && mesh->totloop > 0)) {
return;
}
pxr::UsdGeomPrimvarsAPI pv_api = pxr::UsdGeomPrimvarsAPI(mesh_prim_);
std::vector<pxr::UsdGeomPrimvar> primvars = pv_api.GetPrimvarsWithValues();
pxr::TfToken active_color_name;
pxr::TfToken active_uv_set_name;
/* Convert primvars to custom layer data. */
for (pxr::UsdGeomPrimvar &pv : primvars) {
if (!pv.HasValue()) {
WM_reportf(RPT_WARNING,
"Skipping primvar %s, mesh %s -- no value",
pv.GetName().GetText(),
&mesh->id.name[2]);
continue;
}
const pxr::SdfValueTypeName type = pv.GetTypeName();
const pxr::TfToken varying_type = pv.GetInterpolation();
const pxr::TfToken name = pv.StripPrimvarsName(pv.GetPrimvarName());
/* To avoid unnecessarily reloading static primvars during animation,
* early out if not first load and this primvar isn't animated. */
if (!new_mesh && primvar_varying_map_.find(name) != primvar_varying_map_.end() &&
!primvar_varying_map_.at(name))
{
continue;
}
/* Read Color primvars. */
if (convert_usd_type_to_blender(type) == CD_PROP_COLOR) {
if ((settings->read_flag & MOD_MESHSEQ_READ_COLOR) != 0) {
/* Set the active color name to 'displayColor', if a color primvar
* with this name exists. Otherwise, use the name of the first
* color primvar we find for the active color. */
if (active_color_name.IsEmpty() || name == usdtokens::displayColor) {
active_color_name = name;
}
read_color_data_primvar(mesh, pv, motionSampleTime);
}
}
/* Read UV primvars. */
else if (ELEM(varying_type,
pxr::UsdGeomTokens->vertex,
pxr::UsdGeomTokens->faceVarying,
pxr::UsdGeomTokens->varying) &&
convert_usd_type_to_blender(type) == CD_PROP_FLOAT2)
{
if ((settings->read_flag & MOD_MESHSEQ_READ_UV) != 0) {
/* Set the active uv set name to 'st', if a uv set primvar
* with this name exists. Otherwise, use the name of the first
* uv set primvar we find for the active uv set. */
if (active_uv_set_name.IsEmpty() || name == usdtokens::st) {
active_uv_set_name = name;
}
read_uv_data_primvar(mesh, pv, motionSampleTime);
}
}
/* Read all other primvars. */
else {
if ((settings->read_flag & MOD_MESHSEQ_READ_ATTRIBUTES) != 0) {
read_generic_data_primvar(mesh, pv, motionSampleTime);
}
}
/* Record whether the primvar attribute might be time varying. */
if (primvar_varying_map_.find(name) == primvar_varying_map_.end()) {
bool might_be_time_varying = pv.ValueMightBeTimeVarying();
primvar_varying_map_.insert(std::make_pair(name, might_be_time_varying));
if (might_be_time_varying) {
is_time_varying_ = true;
}
}
} /* End primvar attribute loop. */
if (!active_color_name.IsEmpty()) {
BKE_id_attributes_default_color_set(&mesh->id, active_color_name.GetText());
BKE_id_attributes_active_color_set(&mesh->id, active_color_name.GetText());
}
if (!active_uv_set_name.IsEmpty()) {
int layer_index = CustomData_get_named_layer_index(
&mesh->loop_data, CD_PROP_FLOAT2, active_uv_set_name.GetText());
if (layer_index > -1) {
CustomData_set_layer_active_index(&mesh->loop_data, CD_PROP_FLOAT2, layer_index);
CustomData_set_layer_render_index(&mesh->loop_data, CD_PROP_FLOAT2, layer_index);
}
}
}
void USDMeshReader::assign_facesets_to_material_indices(double motionSampleTime,
MutableSpan<int> material_indices,
std::map<pxr::SdfPath, int> *r_mat_map)
{
if (r_mat_map == nullptr) {
return;
}
/* Find the geom subsets that have bound materials.
* We don't call #pxr::UsdShadeMaterialBindingAPI::GetMaterialBindSubsets()
* because this function returns only those subsets that are in the 'materialBind'
* family, but, in practice, applications (like Houdini) might export subsets
* in different families that are bound to materials.
* TODO(makowalski): Reassess if the above is the best approach. */
const std::vector<pxr::UsdGeomSubset> subsets = pxr::UsdGeomSubset::GetAllGeomSubsets(
mesh_prim_);
int current_mat = 0;
if (!subsets.empty()) {
for (const pxr::UsdGeomSubset &subset : subsets) {
pxr::UsdShadeMaterial subset_mtl = utils::compute_bound_material(subset.GetPrim());
if (!subset_mtl) {
continue;
}
pxr::SdfPath subset_mtl_path = subset_mtl.GetPath();
if (subset_mtl_path.IsEmpty()) {
continue;
}
if (r_mat_map->find(subset_mtl_path) == r_mat_map->end()) {
(*r_mat_map)[subset_mtl_path] = 1 + current_mat++;
}
const int mat_idx = (*r_mat_map)[subset_mtl_path] - 1;
pxr::UsdAttribute indicesAttribute = subset.GetIndicesAttr();
pxr::VtIntArray indices;
indicesAttribute.Get(&indices, motionSampleTime);
for (const int i : indices) {
material_indices[i] = mat_idx;
}
}
}
if (r_mat_map->empty()) {
pxr::UsdShadeMaterial mtl = utils::compute_bound_material(prim_);
if (mtl) {
pxr::SdfPath mtl_path = mtl.GetPath();
if (!mtl_path.IsEmpty()) {
r_mat_map->insert(std::make_pair(mtl.GetPath(), 1));
}
}
}
}
void USDMeshReader::readFaceSetsSample(Main *bmain, Mesh *mesh, const double motionSampleTime)
{
if (!import_params_.import_materials) {
return;
}
std::map<pxr::SdfPath, int> mat_map;
bke::MutableAttributeAccessor attributes = mesh->attributes_for_write();
bke::SpanAttributeWriter<int> material_indices = attributes.lookup_or_add_for_write_span<int>(
"material_index", ATTR_DOMAIN_FACE);
this->assign_facesets_to_material_indices(motionSampleTime, material_indices.span, &mat_map);
material_indices.finish();
/* Build material name map if it's not built yet. */
if (this->settings_->mat_name_to_mat.empty()) {
build_material_map(bmain, &this->settings_->mat_name_to_mat);
}
utils::assign_materials(bmain,
object_,
mat_map,
this->import_params_,
this->prim_.GetStage(),
this->settings_->mat_name_to_mat,
this->settings_->usd_path_to_mat_name);
}
Mesh *USDMeshReader::read_mesh(Mesh *existing_mesh,
const USDMeshReadParams params,
const char ** /*err_str*/)
{
if (!mesh_prim_) {
return existing_mesh;
}
mesh_prim_.GetOrientationAttr().Get(&orientation_);
if (orientation_ == pxr::UsdGeomTokens->leftHanded) {
is_left_handed_ = true;
}
Mesh *active_mesh = existing_mesh;
bool new_mesh = false;
/* TODO(makowalski): implement the optimization of only updating the mesh points when
* the topology is consistent, as in the Alembic importer. */
ImportSettings settings;
settings.read_flag |= params.read_flags;
if (topology_changed(existing_mesh, params.motion_sample_time)) {
new_mesh = true;
active_mesh = BKE_mesh_new_nomain_from_template(
existing_mesh, positions_.size(), 0, face_counts_.size(), face_indices_.size());
}
read_mesh_sample(
&settings, active_mesh, params.motion_sample_time, new_mesh || is_initial_load_);
if (new_mesh) {
/* Here we assume that the number of materials doesn't change, i.e. that
* the material slots that were created when the object was loaded from
* USD are still valid now. */
if (active_mesh->faces_num != 0 && import_params_.import_materials) {
std::map<pxr::SdfPath, int> mat_map;
bke::MutableAttributeAccessor attributes = active_mesh->attributes_for_write();
bke::SpanAttributeWriter<int> material_indices =
attributes.lookup_or_add_for_write_span<int>("material_index", ATTR_DOMAIN_FACE);
assign_facesets_to_material_indices(
params.motion_sample_time, material_indices.span, &mat_map);
material_indices.finish();
}
}
return active_mesh;
}
std::string USDMeshReader::get_skeleton_path() const
{
/* Make sure we can apply UsdSkelBindingAPI to the prim.
* Attempting to apply the API to instance proxies generates
* a USD error. */
if (!prim_ || prim_.IsInstanceProxy()) {
return "";
}
pxr::UsdSkelBindingAPI skel_api = pxr::UsdSkelBindingAPI::Apply(prim_);
if (!skel_api) {
return "";
}
if (pxr::UsdSkelSkeleton skel = skel_api.GetInheritedSkeleton()) {
return skel.GetPath().GetAsString();
}
return "";
}
std::optional<XformResult> USDMeshReader::get_local_usd_xform(const float time) const
{
if (!import_params_.import_skeletons || prim_.IsInstanceProxy()) {
/* Use the standard transform computation, since we are ignoring
* skinning data. Note that applying the UsdSkelBinding API to an
* instance proxy generates a USD error. */
return USDXformReader::get_local_usd_xform(time);
}
if (pxr::UsdSkelBindingAPI skel_api = pxr::UsdSkelBindingAPI::Apply(prim_)) {
if (skel_api.GetGeomBindTransformAttr().HasAuthoredValue()) {
pxr::GfMatrix4d bind_xf;
if (skel_api.GetGeomBindTransformAttr().Get(&bind_xf)) {
/* 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 {
WM_reportf(RPT_WARNING,
"%s: Couldn't compute geom bind transform for %s",
__func__,
prim_.GetPath().GetAsString().c_str());
}
}
}
return USDXformReader::get_local_usd_xform(time);
}
} // namespace blender::io::usd
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