92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
/* SPDX-FileCopyrightText: 2021 Tangent Animation. All rights reserved.
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* 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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*
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* Adapted from the Blender Alembic importer implementation. */
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#include "usd_reader_camera.h"
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#include "DNA_camera_types.h"
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#include "DNA_object_types.h"
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#include "BLI_math_base.h"
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#include "BKE_camera.h"
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#include "BKE_object.h"
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#include <pxr/pxr.h>
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#include <pxr/usd/usdGeom/camera.h>
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namespace blender::io::usd {
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void USDCameraReader::create_object(Main *bmain, const double /*motionSampleTime*/)
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{
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Camera *bcam = static_cast<Camera *>(BKE_camera_add(bmain, name_.c_str()));
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object_ = BKE_object_add_only_object(bmain, OB_CAMERA, name_.c_str());
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object_->data = bcam;
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}
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void USDCameraReader::read_object_data(Main *bmain, const double motionSampleTime)
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{
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Camera *bcam = (Camera *)object_->data;
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pxr::UsdGeomCamera cam_prim(prim_);
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if (!cam_prim) {
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return;
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}
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pxr::VtValue val;
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cam_prim.GetFocalLengthAttr().Get(&val, motionSampleTime);
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pxr::VtValue verApOffset;
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cam_prim.GetVerticalApertureOffsetAttr().Get(&verApOffset, motionSampleTime);
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pxr::VtValue horApOffset;
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cam_prim.GetHorizontalApertureOffsetAttr().Get(&horApOffset, motionSampleTime);
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pxr::VtValue clippingRangeVal;
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cam_prim.GetClippingRangeAttr().Get(&clippingRangeVal, motionSampleTime);
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pxr::VtValue focalDistanceVal;
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cam_prim.GetFocusDistanceAttr().Get(&focalDistanceVal, motionSampleTime);
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pxr::VtValue fstopVal;
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cam_prim.GetFStopAttr().Get(&fstopVal, motionSampleTime);
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pxr::VtValue projectionVal;
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cam_prim.GetProjectionAttr().Get(&projectionVal, motionSampleTime);
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pxr::VtValue verAp;
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cam_prim.GetVerticalApertureAttr().Get(&verAp, motionSampleTime);
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pxr::VtValue horAp;
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cam_prim.GetHorizontalApertureAttr().Get(&horAp, motionSampleTime);
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/*
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* For USD, these camera properties are in tenths of a world unit.
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* https://graphics.pixar.com/usd/release/api/class_usd_geom_camera.html#UsdGeom_CameraUnits
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* tenth_of_unit = stage_meters_per_unit / 10
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* val_in_meters = val.Get<float>() * tenth_of_unit
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* val_in_millimeters = val_in_meters * 1000
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*/
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const double scale_to_mm = 100.0 * settings_->stage_meters_per_unit;
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bcam->lens = val.Get<float>() * scale_to_mm;
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bcam->sensor_x = horAp.Get<float>() * scale_to_mm;
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bcam->sensor_y = verAp.Get<float>() * scale_to_mm;
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bcam->shiftx = verApOffset.Get<float>() * scale_to_mm;
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bcam->shifty = horApOffset.Get<float>() * scale_to_mm;
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bcam->type = (projectionVal.Get<pxr::TfToken>().GetString() == "perspective") ? CAM_PERSP :
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CAM_ORTHO;
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/* Calling UncheckedGet() to silence compiler warnings. */
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bcam->clip_start = max_ff(0.1f, clippingRangeVal.UncheckedGet<pxr::GfVec2f>()[0]);
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bcam->clip_end = clippingRangeVal.UncheckedGet<pxr::GfVec2f>()[1];
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bcam->dof.focus_distance = focalDistanceVal.Get<float>();
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bcam->dof.aperture_fstop = float(fstopVal.Get<float>());
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if (bcam->type == CAM_ORTHO) {
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bcam->ortho_scale = max_ff(verAp.Get<float>(), horAp.Get<float>());
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}
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USDXformReader::read_object_data(bmain, motionSampleTime);
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}
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} // namespace blender::io::usd
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