3d Math problems

R0j5 · Oct 27, 2003

I'm trying to get an actor's forward speed (acceleration) to put into either a float or int variable.
My trouble is in using the actors acceleration and using it's rotation to get the actors speed relative to the view location. Any help on how to do this?

punk129 · Oct 27, 2003

http://wiki.beyondunreal.com/wiki/UnrealScript_Vector_Maths

Daid303 · Oct 27, 2003

Actualy, you just want the length of the acceleration vector.

[SAS]Solid Snake · Oct 27, 2003

Do it like this: VSize(Accleration); //Assuming acceleration is a vector, which it should be

Mr Evi1 · Oct 28, 2003

Daid303 said:
Actualy, you just want the length of the acceleration vector.

That's all very well, as long as the actor is accelerating forwards. If for example it is accelerating at 45 degrees to the direction it is facing, the magnitude of the acceleration will not be the same as the forward acceleration. In that case you need to resolve the acceleration's forward component, something like this:

Code:

ForwardAcceleration = Acceleration Dot vector(rotation);

R0j5 · Oct 28, 2003

Thanks, I knew it was going to be something easy too, I must have skimmed right over the VSize() while looking for the answer to this.
I have a nice looking 3rd person camera up and working now, thanks for the help.

[SAS]Solid Snake · Oct 28, 2003

Mr Evi1

Ahh yes true. It didn't occur to me then. Thanks. We all learn something new everyday.

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3d Math problems

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