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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) 2020 Blender Foundation.
* All rights reserved.
*/
#include "usd_reader_light.h"
#include "BLI_assert.h"
#include "BLI_math_base.h"
#include "BLI_math_matrix.h"
#include "BLI_math_rotation.h"
#include "BLI_utildefines.h"
#include "BKE_light.h"
#include "BKE_object.h"
#include "DNA_light_types.h"
#include "DNA_object_types.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>
#include <iostream>
namespace blender::io::usd {
USDLightReader::USDLightReader(const pxr::UsdPrim &prim, const USDImporterContext &context)
: USDXformableReader(prim, context), light_(prim)
{
}
bool USDLightReader::valid() const
{
return static_cast<bool>(light_);
}
void USDLightReader::create_object(Main *bmain, double time, USDDataCache *data_cache)
{
if (!this->valid()) {
return;
}
/* Determine prim visibility.
* TODO(makowalski): Consider optimizations to avoid this expensive call,
* for example, by determining visibility during stage traversal. */
pxr::TfToken vis_tok = this->light_.ComputeVisibility();
if (vis_tok == pxr::UsdGeomTokens->invisible) {
return;
}
std::string obj_name = get_object_name();
if (obj_name.empty()) {
/* Sanity check. */
std::cerr << "Warning: couldn't determine object name for " << this->prim_path() << std::endl;
}
this->object_ = BKE_object_add_only_object(bmain, OB_LAMP, obj_name.c_str());
std::string light_name = get_data_name();
if (light_name.empty()) {
/* Sanity check. */
std::cerr << "Warning: couldn't determine light name for " << this->prim_path() << std::endl;
}
Light *light = (Light *)BKE_light_add(bmain, light_name.c_str());
this->object_->data = light;
if (prim_.IsA<pxr::UsdLuxDiskLight>()) {
light->type = LA_AREA;
light->area_shape = LA_AREA_DISK;
pxr::UsdLuxDiskLight disk_light(this->prim_);
if (disk_light) {
if (pxr::UsdAttribute radius_attr = disk_light.GetRadiusAttr()) {
float radius = 1.0;
radius_attr.Get(&radius, time);
light->area_size = radius;
}
}
}
else if (prim_.IsA<pxr::UsdLuxDistantLight>()) {
light->type = LA_SUN;
}
else if (prim_.IsA<pxr::UsdLuxRectLight>()) {
light->type = LA_AREA;
light->area_shape = LA_AREA_RECT;
pxr::UsdLuxRectLight rect_light(this->prim_);
if (rect_light) {
if (pxr::UsdAttribute width_attr = rect_light.GetWidthAttr()) {
float width = 1.0;
width_attr.Get(&width, time);
light->area_size = width;
}
if (pxr::UsdAttribute height_attr = rect_light.GetHeightAttr()) {
float height = 1.0;
height_attr.Get(&height, time);
light->area_sizey = height;
}
}
}
else if (prim_.IsA<pxr::UsdLuxSphereLight>()) {
light->type = LA_LOCAL;
pxr::UsdLuxSphereLight sphere_light(this->prim_);
if (sphere_light) {
if (pxr::UsdAttribute radius_attr = sphere_light.GetRadiusAttr()) {
float radius = 1.0;
radius_attr.Get(&radius, time);
light->area_size = radius;
}
}
}
if (pxr::UsdAttribute intensity_attr = light_.GetIntensityAttr()) {
float intensity = 1.0;
intensity_attr.Get(&intensity, time);
light->energy = intensity * context_.import_params.light_intensity_scale;
/* Apply inverse of scaling applied on export in USDLightWriter::do_write().
* TODO(makowalski): confirm that this scaling is correct. */
if (light->type != LA_SUN) {
light->energy *= 100.0f;
}
}
if (pxr::UsdAttribute color_attr = light_.GetColorAttr()) {
pxr::GfVec3f color(1.0);
color_attr.Get(&color, time);
light->r = color[0];
light->g = color[1];
light->b = color[2];
}
if (pxr::UsdAttribute specular_attr = light_.GetSpecularAttr()) {
float specular = 1.0f;
specular_attr.Get(&specular, time);
light->spec_fac = specular;
}
}
void USDLightReader::read_matrix(float r_mat[4][4] /* local matrix */,
const double time,
const float scale) const
{
USDXformableReader::read_matrix(r_mat, time, scale);
/* Conveting from y-up to z-up requires adjusting
* the light rotation. */
if (this->context_.stage_up_axis == pxr::UsdGeomTokens->y) {
float camera_rotation[4][4];
axis_angle_to_mat4_single(camera_rotation, 'X', M_PI_2);
mul_m4_m4m4(r_mat, r_mat, camera_rotation);
}
}
} // namespace blender::io::usd
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