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Newcomers DBPro Corner / How to rotate an object around a point?

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Xlaydos
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Posted: 27th Feb 2005 19:53
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How do you rotate an object around a point?

E.G A Planet orbiting the sun.
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Emperor Baal
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Posted: 27th Feb 2005 19:56
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you'll need sin, cos and an angle

distance# = 50.0
x# = 0.0 + sin(angle) * distance#
z# = 0.0 + cos(angle) * distance#

now when you position something on X# and Z#, it will rotate around point
X0.0, Z0.0

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Xlaydos
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Posted: 27th Feb 2005 20:01
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Could you explain that a bit more please?

I have this code but it doesnt work

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Emperor Baal
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Posted: 27th Feb 2005 20:15
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well, sin and cos return values when you give them an angle... in your case you give them 0.1, this means the object will always stay at angle 0.1

In order to rotate, you need an increasing value:

do
angle# = wrapvalue(angle# + 1.0)
distance# = 50.0
x# = 0.0 + sin(angle#) * distance#
z# = 0.0 + cos(angle#) * distance#
position object 30,x#,object position y(16),z#
loop

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Xlaydos
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Posted: 27th Feb 2005 20:24
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Oh i see

Sorry i phrased my question wrongly,

I meant that i would like the end of the object to rotate around a point like a snooker queue rotating around a ball when left or right is pushed
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Emperor Baal
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Posted: 27th Feb 2005 20:36
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well, its the same so you could use the code from above

add a point object command that points your queue towards the ball.
Now only add or decrease the angle when you hit left or right

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Dark Flame
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Posted: 27th Feb 2005 20:46
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It would be easier if you just gave him the code and annotated it for him.
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Xlaydos
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Posted: 27th Feb 2005 21:04
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Yes it would

I haven't done sin or cos in maths yet so i am a bit confused
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Dark Flame
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Posted: 28th Feb 2005 04:20
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Neither have i...even tho i left school 2 years ago and now doing computer science at college. So i may have the same problem as you when i need to deal with sin or cos.
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Baggers
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Posted: 1st Mar 2005 07:55 Edited at: 1st Mar 2005 07:56
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This is just a little routine to help, it only calculated rotation round a point in the y axies though ( as in like the pic below ).

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