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Math problem in the content example

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    Math problem in the content example

    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:
    Click image for larger version

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    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.

    #2
    ok, I solved this my self. it can look at use abs position - actor position, this is the vector for origin plane's pix vector, and the x+y is the new vector ,so the world offset is equal to use the new vector - the old vector. haha.
    Can believe it took my 5 hours to understand it.

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