void SunLightSource::UpdateSMCamera(Camera const & scene_camera)
{
float3 const dir = this->Direction();
float3 up_vec;
if (abs(MathLib::dot(-dir, scene_camera.UpVec())) > 0.95f)
{
up_vec = scene_camera.RightVec();
}
else
{
up_vec = scene_camera.UpVec();
}
float4x4 light_view = MathLib::look_at_lh(-dir, float3(0, 0, 0), up_vec);
AABBox const aabb = CalcFrustumExtents(scene_camera, scene_camera.NearPlane(), scene_camera.FarPlane(), light_view);
float3 const & center = aabb.Center();
float3 view_pos = MathLib::transform_coord(float3(center.x(), center.y(), aabb.Min().z()), MathLib::inverse(light_view));
sm_camera_->ViewParams(view_pos, view_pos + dir, up_vec);
float3 dimensions = aabb.Max() - aabb.Min();
sm_camera_->ProjOrthoParams(dimensions.x(), dimensions.y(), 0.0f, dimensions.z());
}
void OCTree::DivideNode(size_t index, uint32_t curr_depth)
{
if (octree_[index].obj_ptrs.size() > 1)
{
size_t const this_size = octree_.size();
AABBox const parent_bb = octree_[index].bb;
float3 const parent_center = parent_bb.Center();
octree_[index].first_child_index = static_cast<int>(this_size);
octree_[index].visible = BO_No;
octree_.resize(this_size + 8);
for (SceneObjsType::const_reference so : octree_[index].obj_ptrs)
{
AABBox const & aabb = *so->PosBoundWS();
int mark[6];
mark[0] = aabb.Min().x() >= parent_center.x() ? 1 : 0;
mark[1] = aabb.Min().y() >= parent_center.y() ? 2 : 0;
mark[2] = aabb.Min().z() >= parent_center.z() ? 4 : 0;
mark[3] = aabb.Max().x() >= parent_center.x() ? 1 : 0;
mark[4] = aabb.Max().y() >= parent_center.y() ? 2 : 0;
mark[5] = aabb.Max().z() >= parent_center.z() ? 4 : 0;
for (int j = 0; j < 8; ++ j)
{
if (j == ((j & 1) ? mark[3] : mark[0])
+ ((j & 2) ? mark[4] : mark[1])
+ ((j & 4) ? mark[5] : mark[2]))
{
octree_[this_size + j].obj_ptrs.push_back(so);
}
}
}
for (size_t j = 0; j < 8; ++ j)
{
octree_node_t& new_node = octree_[this_size + j];
new_node.first_child_index = -1;
new_node.bb = AABBox(float3((j & 1) ? parent_center.x() : parent_bb.Min().x(),
(j & 2) ? parent_center.y() : parent_bb.Min().y(),
(j & 4) ? parent_center.z() : parent_bb.Min().z()),
float3((j & 1) ? parent_bb.Max().x() : parent_center.x(),
(j & 2) ? parent_bb.Max().y() : parent_center.y(),
(j & 4) ? parent_bb.Max().z() : parent_center.z()));
if (curr_depth < max_tree_depth_)
{
this->DivideNode(this_size + j, curr_depth + 1);
}
}
SceneObjsType empty;
octree_[index].obj_ptrs.swap(empty);
}
}
