Hi. I have solved this problem. You need to add Z-elevation. When 2 models are on 1 line, one model overlaps the other. Not mash on one Z-elevation. Center point model in one z-elevations. Model with additive display - removes part of the other model.
p.s.
>> 3DObject or a 3DShape? - any maybe, i/.m use both
But i have new. 2D transparent sprite placed in 3D layer ))) any z-elevation... sprite with any blendmode if z-elevation with "-"
>>Cool looking art! What kind of game is it?
Thank you. my wip.