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When I try to add a function about switch to first-person-view,I found the lookAt Matrix use wrong parameter. So I fixed it.
Besides I also have a try the first person vertical offset and found its position may not reasonable, which is 0.6. Thus the first-person-view was build on the legs of the character.
What's more, The engine uses rotation dirty flag to update character orientation. In the third-person-view it works well and save resource but it seems a little strange in the first-person-view.