SDK Question Animation only works in one direction (polarization)

JMW

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Can anyone tell me why (since somewhere in Orbiter Beta) my wheel rotation animations only work if heading in a northerly direction? (heading 330 deg on cape runway 15/33)
It stops from 90 deg either way.........

Is there a fix ?

Code:
 if (iop > 1)iop=0;
    
    if (hspd > 0.4) 
	{
    double aspeed = hspd*1.5;
    if (iop > 1)iop=0;
    if (hspd > 30) aspeed = 30; 
    iop = iop + (aspeed /200);//300
     
    if (hspd <= 0.4) iop=0;
    
    
    if ( GroundContact() && gear_proc < 0.05) {vspdwn = 0; 
	SetAnimation (anim_wheel, iop);}

	}

and
Code:
if (GetAirspeedVector (FRAME_HORIZON,v)) 
 
		hspd = (v.z );

if I change to (GetAirspeedVector (FRAME_GLOBAL,v)) working direction is reversed.........?
 
Last edited:

jedidia

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Can't be sure since I've never worked with this, but a quick glance at the documentation tells me that:

•FRAME_HORIZON: Returns velocity vector in the local horizon frame (x = longitudinal component, y = vertical component, z = latitudinal component)

In other words, z in this frame is movement along the latitude, which would be north or south, and presumably when heading south it would be negative (and since you never reset iop when it falls below 0, that would also result in no animation).

This seems more like what you need:

•FRAME_LOCAL: Returns velocity vector in the vessel's local frame of reference

I.e. z here would always be movement of your vessel along its own z-axis.

Also, just a cosmetic suggestion, don't be afraid of longer variable names. The auto-completion features of your IDE aren't just there for fun, they're there so you can give your variables readable and comprehensible names without having to type them in full every time ;)
 

fred18

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I think it should be GetAirspeed and not the vector, or compute the length of v. Surely not just the z component
 

JMW

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Yep, thanks jedidia. That works.

Thanks too fred18. You're probably right for more accuracy, but it's only simply to "get the wheels turning" :thumbup:
 
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