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/*
* Copyright 2011-2015 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "blender_texture.h"
CCL_NAMESPACE_BEGIN
namespace {
/* Point density helpers. */
static void density_texture_space_invert(float3& loc,
float3& size)
{
if(size.x != 0.0f) size.x = 0.5f/size.x;
if(size.y != 0.0f) size.y = 0.5f/size.y;
if(size.z != 0.0f) size.z = 0.5f/size.z;
loc = loc*size - make_float3(0.5f, 0.5f, 0.5f);
}
static void density_object_texture_space(BL::Object b_ob,
float radius,
float3& loc,
float3& size)
{
if(b_ob.type() == BL::Object::type_MESH) {
BL::Mesh b_mesh(b_ob.data());
loc = get_float3(b_mesh.texspace_location());
size = get_float3(b_mesh.texspace_size());
}
else {
/* TODO(sergey): Not supported currently. */
}
/* Adjust texture space to include density points on the boundaries. */
size = size + make_float3(radius, radius, radius);
density_texture_space_invert(loc, size);
}
static void density_particle_system_texture_space(
BL::Object b_ob,
BL::ParticleSystem b_particle_system,
float radius,
float3& loc,
float3& size)
{
if(b_particle_system.settings().type() == BL::ParticleSettings::type_HAIR) {
/* TODO(sergey): Not supported currently. */
return;
}
Transform tfm = get_transform(b_ob.matrix_world());
Transform itfm = transform_inverse(tfm);
float3 min = make_float3(FLT_MAX, FLT_MAX, FLT_MAX),
max = make_float3(-FLT_MAX, -FLT_MAX, -FLT_MAX);
float3 particle_size = make_float3(radius, radius, radius);
for(int i = 0; i < b_particle_system.particles.length(); ++i) {
BL::Particle particle = b_particle_system.particles[i];
float3 location = get_float3(particle.location());
location = transform_point(&itfm, location);
min = ccl::min(min, location - particle_size);
max = ccl::max(max, location + particle_size);
}
/* Calculate texture space from the particle bounds. */
loc = (min + max) * 0.5f;
size = (max - min) * 0.5f;
density_texture_space_invert(loc, size);
}
} /* namespace */
void point_density_texture_space(BL::ShaderNodeTexPointDensity b_point_density_node,
float3& loc,
float3& size)
{
/* Fallback values. */
loc = make_float3(0.0f, 0.0f, 0.0f);
size = make_float3(0.0f, 0.0f, 0.0f);
BL::Object b_ob(b_point_density_node.object());
if(!b_ob) {
return;
}
if(b_point_density_node.point_source() ==
BL::ShaderNodeTexPointDensity::point_source_PARTICLE_SYSTEM)
{
BL::ParticleSystem b_particle_system(
b_point_density_node.particle_system());
if(b_particle_system) {
density_particle_system_texture_space(b_ob,
b_particle_system,
b_point_density_node.radius(),
loc,
size);
}
}
else {
density_object_texture_space(b_ob,
b_point_density_node.radius(),
loc,
size);
}
}
CCL_NAMESPACE_END
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