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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Math problem in the content example
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rexion started a topic Math problem in the content exampleMath 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:
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.Tags: None
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