What is the difference between Line Trace By Channel and Line Trace For Objects?
What differ and what they have in common?
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Line trace by channel only checks the channel setting of the objects, which gives it a cheaper cost as its probably buffered somewhere for indexing purposes. Line trace by objects will trace all objects and return the associated type requested.
Answer by Marc_Rogerson,
Thanks to him,
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according to UE docs (pasted below), seems that what you want to detect influences ‘by channel’ or ‘for objects’. i setup a custom channel in project settings, then did line trace by channel to detect hits on only the elements i am interested in.
"Channels are used for things like visibility and the camera, and almost exclusively have to do with tracing. Object Types are the physics types of Actors with collision in your scene, such as Pawns, Vehicles, Destructible Actors, and so on. "
"Multi Trace For Objects will return everything that matches an object type the trace is looking for, assuming the component is set to return trace queries. This makes it great for counting the number of objects between the start and end of the trace. "