f92bfe0f0b
Make use of our sparse value writer in more places. Namely, when using animated Camera or Light properties, this will prevent a needless stream of unchanging values being written into the USD file [1]. Skeletons and armatures benefit too but less so as typically the primary benefit only applies to the comparatively small `scale` transform attribute, which typically remains unchanged from frame to frame. The newly added `set_attribute` common code can, and eventually will, be used to reduce boilerplate elsewhere where we do the same sparse writing dance. Ref #130759 Pull Request: https://projects.blender.org/blender/blender/pulls/131333
126 lines
4.6 KiB
C++
126 lines
4.6 KiB
C++
/* SPDX-FileCopyrightText: 2019 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "usd_writer_camera.hh"
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#include "usd_attribute_utils.hh"
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#include "usd_hierarchy_iterator.hh"
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#include <pxr/usd/usdGeom/camera.h>
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#include <pxr/usd/usdGeom/tokens.h>
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#include "BKE_camera.h"
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#include "BLI_assert.h"
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#include "DEG_depsgraph_query.hh"
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#include "DNA_camera_types.h"
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#include "DNA_scene_types.h"
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namespace blender::io::usd {
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USDCameraWriter::USDCameraWriter(const USDExporterContext &ctx) : USDAbstractWriter(ctx) {}
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bool USDCameraWriter::is_supported(const HierarchyContext *context) const
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{
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const Camera *camera = static_cast<const Camera *>(context->object->data);
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return camera->type == CAM_PERSP;
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}
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static void camera_sensor_size_for_render(const Camera *camera,
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const RenderData *rd,
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float *r_sensor,
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float *r_sensor_x,
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float *r_sensor_y)
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{
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/* Compute the final image size in pixels. */
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float sizex = rd->xsch * rd->xasp;
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float sizey = rd->ysch * rd->yasp;
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int sensor_fit = BKE_camera_sensor_fit(camera->sensor_fit, sizex, sizey);
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float sensor_size = BKE_camera_sensor_size(
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camera->sensor_fit, camera->sensor_x, camera->sensor_y);
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*r_sensor = sensor_size;
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switch (sensor_fit) {
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case CAMERA_SENSOR_FIT_HOR:
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*r_sensor_x = sensor_size;
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*r_sensor_y = sensor_size * sizey / sizex;
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break;
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case CAMERA_SENSOR_FIT_VERT:
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*r_sensor_x = sensor_size * sizex / sizey;
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*r_sensor_y = sensor_size;
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break;
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case CAMERA_SENSOR_FIT_AUTO:
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BLI_assert_msg(0, "Camera fit should be either horizontal or vertical");
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break;
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}
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}
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void USDCameraWriter::do_write(HierarchyContext &context)
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{
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pxr::UsdTimeCode timecode = get_export_time_code();
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pxr::UsdGeomCamera usd_camera = pxr::UsdGeomCamera::Define(usd_export_context_.stage,
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usd_export_context_.usd_path);
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const Camera *camera = static_cast<const Camera *>(context.object->data);
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const Scene *scene = DEG_get_evaluated_scene(usd_export_context_.depsgraph);
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usd_camera.CreateProjectionAttr().Set(pxr::UsdGeomTokens->perspective);
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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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*
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* tenth_unit_to_meters = stage_meters_per_unit / 10
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* tenth_unit_to_millimeters = 1000 * unit_to_tenth_unit
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* = 100 * stage_meters_per_unit
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*/
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const float tenth_unit_to_mm = 100.0f * scene->unit.scale_length;
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float sensor_size, aperture_x, aperture_y;
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camera_sensor_size_for_render(camera, &scene->r, &sensor_size, &aperture_x, &aperture_y);
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set_attribute(usd_camera.CreateFocalLengthAttr(pxr::VtValue(), true),
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camera->lens / tenth_unit_to_mm,
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timecode,
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usd_value_writer_);
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set_attribute(usd_camera.CreateHorizontalApertureAttr(pxr::VtValue(), true),
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aperture_x / tenth_unit_to_mm,
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timecode,
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usd_value_writer_);
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set_attribute(usd_camera.CreateVerticalApertureAttr(pxr::VtValue(), true),
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aperture_y / tenth_unit_to_mm,
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timecode,
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usd_value_writer_);
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set_attribute(usd_camera.CreateHorizontalApertureOffsetAttr(pxr::VtValue(), true),
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sensor_size * camera->shiftx / tenth_unit_to_mm,
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timecode,
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usd_value_writer_);
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set_attribute(usd_camera.CreateVerticalApertureOffsetAttr(pxr::VtValue(), true),
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sensor_size * camera->shifty / tenth_unit_to_mm,
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timecode,
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usd_value_writer_);
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set_attribute(usd_camera.CreateClippingRangeAttr(pxr::VtValue(), true),
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pxr::GfVec2f(camera->clip_start, camera->clip_end),
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timecode,
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usd_value_writer_);
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/* Write DoF-related attributes. */
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if (camera->dof.flag & CAM_DOF_ENABLED) {
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const float focus_distance = BKE_camera_object_dof_distance(context.object);
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set_attribute(usd_camera.CreateFStopAttr(pxr::VtValue(), true),
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camera->dof.aperture_fstop,
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timecode,
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usd_value_writer_);
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set_attribute(usd_camera.CreateFocusDistanceAttr(pxr::VtValue(), true),
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focus_distance,
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timecode,
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usd_value_writer_);
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}
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auto prim = usd_camera.GetPrim();
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write_id_properties(prim, camera->id, timecode);
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}
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} // namespace blender::io::usd
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