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1  Game Development / Newbie & Debugging Questions / Re: vector math question. Help pls!! on: 2004-10-13 07:38:59
that is even better. thanks Smiley
2  Game Development / Newbie & Debugging Questions / Re: vector math question. Help pls!! on: 2004-10-10 14:44:19
i think Abuse's answer is quite smart and it certainly solves this 2d problem  Cheesy

thank you Crystalsquid also, i think what u r talking about is orthogonal martix, rite? the reason i asked this question is becos i do want to find out the degree and the sign.

Thank you all.
3  Game Development / Newbie & Debugging Questions / vector math question. Help pls!! on: 2004-10-08 15:01:16
My question is I have two objects. ObjA at posA and ObjB at posB. ObjA has a normal(facing) and want to know how much deg to turn in order to face ObjB.

vectorBtoA = posA - posB
arccos(dotproduct(normalize(ObjA's facing)), normalize(vectorBtoA)))

what I get is a degree but don't have a sign to indicate which way to turn. Any suggestion or better approach?
Thank you very much.
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