6c11811710
Instead of converting to a string immediately, only convert to a string when necessary, like for trace logging. This reduces the size of the `USDPrimReader` base class by 24 bytes, makes several Vectors and Maps smaller at runtime, and reduces some unnecessary string allocations and conversions in various other places. The recently added python Hook `get_prim_path` dictionary will now contain `SdfPath` objects rather than strings; removing the string conversion cost when calling other USD APIs like `GetPrimAtPath` which take in `SdfPath` objects to begin with. This also makes the code a bit more self explanatory since the type makes it clear what kind of path you are dealing with. Pull Request: https://projects.blender.org/blender/blender/pulls/133954
116 lines
3.9 KiB
C++
116 lines
3.9 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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* Adapted from the Blender Alembic importer implementation.
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* Modifications Copyright 2021 Tangent Animation and. NVIDIA Corporation. All rights reserved. */
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#pragma once
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#include "BLI_map.hh"
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#include "BLI_span.hh"
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#include "usd.hh"
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#include "usd_reader_geom.hh"
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#include <pxr/usd/usdGeom/mesh.h>
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namespace blender::io::usd {
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class USDMeshReader : public USDGeomReader {
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private:
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pxr::UsdGeomMesh mesh_prim_;
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blender::Map<const pxr::TfToken, bool> primvar_varying_map_;
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/* TODO(makowalski): Is it the best strategy to cache the
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* mesh geometry in the following members? It appears these
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* arrays are never cleared, so this might bloat memory. */
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pxr::VtIntArray face_indices_;
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pxr::VtIntArray face_counts_;
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pxr::VtVec3fArray positions_;
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pxr::VtVec3fArray normals_;
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pxr::TfToken normal_interpolation_;
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pxr::TfToken orientation_;
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bool is_left_handed_ = false;
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bool is_time_varying_ = false;
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/* This is to ensure we load all data once, because we reuse the read_mesh function
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* in the mesh seq modifier, and in initial load. Ideally, a better fix would be
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* implemented. Note this will break if faces or positions vary. */
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bool is_initial_load_ = false;
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public:
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USDMeshReader(const pxr::UsdPrim &prim,
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const USDImportParams &import_params,
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const ImportSettings &settings)
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: USDGeomReader(prim, import_params, settings), mesh_prim_(prim)
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{
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}
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bool valid() const override
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{
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return bool(mesh_prim_);
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}
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void create_object(Main *bmain, double motionSampleTime) override;
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void read_object_data(Main *bmain, double motionSampleTime) override;
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void read_geometry(bke::GeometrySet &geometry_set,
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USDMeshReadParams params,
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const char **r_err_str) override;
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bool topology_changed(const Mesh *existing_mesh, double motionSampleTime) override;
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/**
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* If the USD mesh prim has a valid `UsdSkel` schema defined, return the USD path
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* string to the bound skeleton, if any. Returns the empty string if no skeleton
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* binding is defined.
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*
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* The returned path is currently used to match armature modifiers with armature
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* objects during import.
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*/
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pxr::SdfPath get_skeleton_path() const;
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private:
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void process_normals_vertex_varying(Mesh *mesh);
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void process_normals_face_varying(Mesh *mesh) const;
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/** Set USD uniform (per-face) normals as Blender loop normals. */
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void process_normals_uniform(Mesh *mesh) const;
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void readFaceSetsSample(Main *bmain, Mesh *mesh, double motionSampleTime);
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void assign_facesets_to_material_indices(double motionSampleTime,
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MutableSpan<int> material_indices,
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blender::Map<pxr::SdfPath, int> *r_mat_map);
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void read_mpolys(Mesh *mesh) const;
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void read_subdiv();
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void read_vertex_creases(Mesh *mesh, double motionSampleTime);
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void read_edge_creases(Mesh *mesh, double motionSampleTime);
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void read_velocities(Mesh *mesh, double motionSampleTime);
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void read_mesh_sample(ImportSettings *settings,
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Mesh *mesh,
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double motionSampleTime,
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bool new_mesh);
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Mesh *read_mesh(struct Mesh *existing_mesh,
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const USDMeshReadParams params,
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const char **r_err_str);
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void read_custom_data(const ImportSettings *settings,
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Mesh *mesh,
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double motionSampleTime,
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bool new_mesh);
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void read_uv_data_primvar(Mesh *mesh,
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const pxr::UsdGeomPrimvar &primvar,
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const double motionSampleTime);
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/**
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* Override transform computation to account for the binding
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* transformation for skinned meshes.
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*/
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std::optional<XformResult> get_local_usd_xform(float time) const override;
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};
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} // namespace blender::io::usd
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