I have a math question for those of you who are gifted in the area. I can't find it through google because I am not sure how to ask the question.
Basically the problem is this: I have a physics object with velocity x,y. Because I need to know it's velocity relative to an arbitrary axis I calculate that and store it as Xg,Yg (it's based on the direction gravity is pulling where Yg relates to relative up/down). I calculate Xg,Yg based on polar projections using GravityAngle. Now here is what I need to do- I check Xg and if it is under a certain threshold I need to set it to zip, but the only way I can do that is by setting the objects velocity which is stored as x,y. what is the equation to alter the objects velocity in x,y such that Xg will be 0 and Yg will remain the same, and vica versa?