I am study on the Math Hull example, there is a 2.20, use camera vector to make the object with the material face the actor.

In the material:

I just don't get it. The X+Y already have the plane right? so what the rest mean? Why subtract absolute world position and add actor position?

Please help me, guys. Thx a lot.

In the material:

I just don't get it. The X+Y already have the plane right? so what the rest mean? Why subtract absolute world position and add actor position?

Please help me, guys. Thx a lot.

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