what does GetAxes() do?

[navboy]

i know the x,y,z are out variables, but i don't know what the function does, or what gets sent or returned in x,y,z, and if they are vectors or what ...

Looked around and couldn't find it anywhere in the actor hierarchy, is this a special function of some sort?

 

[butto]

I responded to the same question in an older thread.

http://forums.beyondunreal.com/showthread.php?s=&threadid=101267

 

[navboy]

okay, i've found some more examples of it and it looks like it returns normal vectors along the x, y, and z axes for what direction the supplied rotator points in?

But how is this different from just casting the rotator to a vector then using that; isn't it basically the same info only with three less vector variables to mess with?

 

[navboy]

cool, thanks, that mostly makes sense, except that the example given:

GetAxes(rotation, X, Y, Z);
StartTrace = Location;
EndTrace = StartTrace + vector(rotation) * 10000;
Trace(HitLocation, HitNormal, EndTrace, StartTrace, True);
spawn(class'BlastMark',,,HitLocation);


never ends up using X, Y or Z after calling GetAxes and i've seen this same type of thing elsewhere, which makes me wonder if i'm missing something about the way it works. It doesn't do something to its first param too does it ("rotation" in this case)?

 

[Wormbo]

Originally posted by navboy
Looked around and couldn't find it anywhere in the actor hierarchy, is this a special function of some sort?

It's declared in Object (superclass of Actor, line 233):

native(229) static final function GetAxes (rotator A, out vector X, out vector Y, out vector Z);

What makes me wonder is the GetUnAxes() function right below that line. It uses the very same parameters, but what does it do?

 

[navboy]

hmm, well below i posted logging where i stood facing northwest and caused it to log both GetAxes and GetUnAxes, then faced west and did it again. It's not immediately obvious to me what it's doing but it almost strikes me as maybe using a left-handed coordinate system instead of a right-handed one?


facing Northwest:
ScriptLog: GetAxes gave X -0.665807,-0.744300,0.052132 Y 0.745327,-0.666699,0.000383 Z 0.034471,0.039110,0.998640 , InstigatorVelocity Dot X is 0.000000
ScriptLog: GetUnAxes gave X -0.665807,0.745327,0.034471 Y -0.744300,-0.666699,0.039110 Z 0.052132,0.000383,0.998640 , InstigatorVelocity Dot X is 0.000000


facing West:
ScriptLog: GetAxes gave X -0.999633,-0.007284,0.026075 Y 0.007286,-0.999973,0.000000 Z 0.026074,0.000190,0.999660 , InstigatorVelocity Dot X is 0.000000
ScriptLog: GetUnAxes gave X -0.999633,0.007286,0.026074 Y -0.007284,-0.999973,0.000190 Z 0.026075,0.000000,0.999660 , InstigatorVelocity Dot X is 0.000000