シェーディング環境のプロパティを変更する

local data_component_manager = stingray.EntityManager.render_data_component(SimpleProject.world)
local all_entity_handles = stingray.World.entities(SimpleProject.world)

-- iterate through all entities in the world.
for _, entity_handle in ipairs(all_entity_handles) do

  -- the shading environment is a render data component, so we retrieve all render data components
  -- owned by this entity and iterate through them.
  -- instances() returns the values on the stack, so we wrap the call in {} to get an array.
  local all_data_component_handles = {stingray.RenderDataComponent.instances(data_component_manager, entity_handle)}
  for _, data_component_handle in ipairs(all_data_component_handles) do

    -- Test whether or not this data component is the shading environment component
    -- that we want to modify.
    -- Missing properties return nil, so this is "safe".
    local shading_environment_mapping_resource_name = stingray.RenderDataComponent.get_property(data_component_manager, data_component_handle, {"shading_environment_mapping"})
    if shading_environment_mapping_resource_name == "core/stingray_renderer/shading_environment_components/exposure" then
      if (shading_env_entity == nil) then
        -- remember the shading environment entity.
        shading_env_entity = entity_handle
      end
      exposure_component = data_component_handle;
      -- now we have the shading environment entity and the component, we can set the
      -- value we want for the property.
      stingray.RenderDataComponent.set_property(data_component_manager, exposure_component, {"exposure"}, exposure_val)
    end
  end
end