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Newcomers DBPro Corner / Is the car going backwards or forwards?

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Oliver
23
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Joined: 24th Nov 2002
Location: Switzerland
Posted: 5th Aug 2003 10:58
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How can you find the speed of a moving object and have it positive when going forward and negative for backwards.

Not sure if this is a really simple question or not , but its got me thinking for a long time,

Thanks
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ReD_eYe
23
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Joined: 9th Mar 2003
Location: United Kingdom
Posted: 5th Aug 2003 11:08
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you use variables!
for instance
speed=5
move object car,speed
you can then set speed to a minus value to make the car reverse, or increase it to speed it up

I have a website!!!
So go there: http://www.freewebs.com/darkb/index.htm
on second thought you probably shouldn't
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Oliver
23
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Joined: 24th Nov 2002
Location: Switzerland
Posted: 5th Aug 2003 11:54
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Well that would be nice, but the problem is a little bit more complicated. I am trying to find the speed of a car, though there is a lot of physics involved. It has momentum, and uses the newxvalue and newzvalue commands.

So I could find the absolute speed by adding the two vectors . However I am using the speed for turning the wheels of the car. So even if you go backwards the wheels still turn forwards. For example:

(xspd#^2+zspd#^2)

Thanks
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Scorpyo
23
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Joined: 26th Aug 2002
Location: italy
Posted: 6th Aug 2003 00:10
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in pseudo code:

if result<0 then wheelrotation=wheelrotation * -1

hope it explains the concept..
cheers
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