is_special_project_tech = yes gives the the icon a special border and background
defined similarly as the icons. As an example of the define:
GFX_technology_infantry_folder_special_project_small_available_item_bg
For techs that have a path to techs in a different tree the script ignore_for_layout = yes is added and is used like this.
path = { leads_to_tech = basic_light_cruiser research_cost_coeff = 1 ignore_for_layout = yes }
it prevents the follow up techs being seen as part of the tree the tech the path is in.
is_special_project_tech = yes
gives the the icon a special border and background defined similarly as the icons. As an example of the define:GFX_technology_infantry_folder_special_project_small_available_item_bg
For techs that have a path to techs in a different tree the script
ignore_for_layout = yes
is added and is used like this.path = { leads_to_tech = basic_light_cruiser research_cost_coeff = 1 ignore_for_layout = yes }
it prevents the follow up techs being seen as part of the tree the tech the path is in.