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Center of gravity gauge

Deano1973

Deano1973

Resource contributor
Messages
384
Country
unitedkingdom
Hi folks, very quick XML question! I have a CoG gauge that is working perfectly well over 100 frames. The problem is that the gauge in my aircraft only depicts the 50% to 60% CoG range of CoG movement, so my animated CoG marker of course only moves about in the centre 10% or so of the gauge. How would I use scale in XML, in order to get my CoG marker to move from the top to the bottom of the gauge in the correct way? I've tried all sorts of methods but nothing's really worked at all. This would be easy in a 2D gauge using <value> and <scale> etc, but is not so easy in a 3D modeled gauge.

Code: 
  <PartInfo>
    <Name>needle_CG</Name>
    <AnimLength>100</AnimLength>
    <Animation>
      <Parameter>
        <Code>(A:CG PERCENT, percent) 0 max 100 min</Code>
        <Lag>50</Lag>
        </Parameter>
    </Animation>
  </PartInfo>

CoG.png


Thanks in advance to anybody who takes the time to answer :)
 
spokes2112

spokes2112

Messages
440
Country
us-wisconsin
Dean,

What you would need is bias/offset* to get the gauge to display properly.
The minimum CG is 50 and this at KF zero so offset it by:
(A:CG PERCENT, percent) 50 -
Now that you have your zero KF point you need bias the remaining keyframes (100) compared to values (61-50 = 11) .
100 / 11 = 9.090909
Now the full code :
<Code>(A:CG PERCENT, percent) 50 max 61 min 50 - 9.090909 *</Code>

*Fr Bill has more info about this in the modelling sub forum, somewhere. ( sorry, don't have time to find )

EDIT - "sometimes a picture can tell a thousand words"
Example.png
 
Last edited:
Deano1973

Deano1973

Resource contributor
Messages
384
Country
unitedkingdom
spokes2112 said:
Dean,

What you would need is bias/offset* to get the gauge to display properly.
Click to expand...

Ah, thanks so much Roman, that worked perfectly! I'd tried the bias and offset method, but didn't understand & add the calculations at the end! Method saved for future reference :)
 
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