Differential D6287 Diff 19841 source/blender/usd/intern/usd_writer_light.cc

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source/blender/usd/intern/usd_writer_light.cc

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				/*
				* This program is free software; you can redistribute it and/or
				* modify it under the terms of the GNU General Public License
				* as published by the Free Software Foundation; either version 2
				* of the License, or (at your option) any later version.
				*
				* This program is distributed in the hope that it will be useful,
				* but WITHOUT ANY WARRANTY; without even the implied warranty of
				* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
				* GNU General Public License for more details.
				*
				* You should have received a copy of the GNU General Public License
				* along with this program; if not, write to the Free Software Foundation,
				* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
				*
				* The Original Code is Copyright (C) 2019 Blender Foundation.
				* All rights reserved.
				*/
				#include "usd_writer_light.h"
				#include "usd_hierarchy_iterator.h"

				#include <pxr/usd/usdLux/diskLight.h>
				#include <pxr/usd/usdLux/distantLight.h>
				#include <pxr/usd/usdLux/rectLight.h>
				#include <pxr/usd/usdLux/sphereLight.h>

				extern "C" {
				#include "BLI_assert.h"
				#include "BLI_utildefines.h"

				#include "DNA_light_types.h"
				#include "DNA_object_types.h"
				}

				USDLightWriter::USDLightWriter(const USDExporterContext &ctx) : USDAbstractWriter(ctx)
				{
				}

				bool USDLightWriter::is_supported(const Object *object) const
				{
				Light light = static_cast<Light >(object->data);
				return ELEM(light->type, LA_AREA, LA_LOCAL, LA_SUN);
				}

				void USDLightWriter::do_write(HierarchyContext &context)
				{
				pxr::UsdStageRefPtr stage = usd_export_context_.stage;
				const pxr::SdfPath &usd_path = usd_export_context_.usd_path;
				pxr::UsdTimeCode timecode = get_export_time_code();

				Light light = static_cast<Light >(context.object->data);
				pxr::UsdLuxLight usd_light;

				switch (light->type) {
				case LA_AREA:
				switch (light->area_shape) {
				case LA_AREA_DISK:
				case LA_AREA_ELLIPSE: { /* An ellipse light will deteriorate into a disk light. */
				pxr::UsdLuxDiskLight disk_light = pxr::UsdLuxDiskLight::Define(stage, usd_path);
				disk_light.CreateRadiusAttr().Set(light->area_size, timecode);
				usd_light = disk_light;
				break;
				}
				case LA_AREA_RECT: {
				pxr::UsdLuxRectLight rect_light = pxr::UsdLuxRectLight::Define(stage, usd_path);
				rect_light.CreateWidthAttr().Set(light->area_size, timecode);
				rect_light.CreateHeightAttr().Set(light->area_sizey, timecode);
				usd_light = rect_light;
				break;
				}
				case LA_AREA_SQUARE: {
				pxr::UsdLuxRectLight rect_light = pxr::UsdLuxRectLight::Define(stage, usd_path);
				rect_light.CreateWidthAttr().Set(light->area_size, timecode);
				rect_light.CreateHeightAttr().Set(light->area_size, timecode);
				usd_light = rect_light;
				break;
				}
				}
				break;
				case LA_LOCAL: {
				pxr::UsdLuxSphereLight sphere_light = pxr::UsdLuxSphereLight::Define(stage, usd_path);
				sphere_light.CreateRadiusAttr().Set(light->area_size, timecode);
				usd_light = sphere_light;
				break;
				}
				case LA_SUN:
				usd_light = pxr::UsdLuxDistantLight::Define(stage, usd_path);
				break;
				default:
				BLI_assert(!"is_supported() returned true for unsupported light type");
				}

				/* Scale factor to get to somewhat-similar illumination. Since the USDViewer had similar
				* over-exposure as Blender Internal with the same values, this code applies the reverse of the
				* versioning code in light_emission_unify(). */
				float usd_intensity;
				if (light->type == LA_SUN) {
				/* Untested, as the Hydra GL viewport of USDViewer doesn't support distant lights. */
				usd_intensity = light->energy;
				}
				else {
				usd_intensity = light->energy / 100.f;
				}
				sergeyUnsubmitted Done Inline Actions `100.0f`. Any way to verify it outside of Hydra? sergey: `100.0f`. Any way to verify it outside of Hydra?
				sybrenAuthorUnsubmitted Done Inline Actions Not as a far as I know. sybren: Not as a far as I know.
				usd_light.CreateIntensityAttr().Set(usd_intensity, timecode);

				usd_light.CreateColorAttr().Set(pxr::GfVec3f(light->r, light->g, light->b), timecode);
				usd_light.CreateSpecularAttr().Set(light->spec_fac, timecode);
				}