The non radar workaround is you create an aura like the mothership cloak that can target any unit that is not visible and applies a Buff behaviour to them. You then use a copy of the fungal growth Model actor that is modified to be created and destroyed by that behaviour.
The Actor - Fog Visibility field is a good start under the actor for the blip. Or create a Buff behaviour with a periodic Search effect that applies a Buff behaviour with an Apply Behavior effect which then creates a fog visible Model actor.
Radar uses the hard coded BlipVisual actor.
The non radar workaround is you create an aura like the mothership cloak that can target any unit that is not visible and applies a Buff behaviour to them. You then use a copy of the fungal growth Model actor that is modified to be created and destroyed by that behaviour.
There is an actor type called Model.
http://www.sc2mapster.com/wiki/galaxy/data/actors/type/model/
Also look at the tutorials by ProzaicMuse on attachments.
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg
The Actor - Fog Visibility field is a good start under the actor for the blip. Or create a Buff behaviour with a periodic Search effect that applies a Buff behaviour with an Apply Behavior effect which then creates a fog visible Model actor.
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg