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Thread: Java 3D circular movement?
 08112011, 03:18 PM #1Member
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Java 3D circular movement?
Hello,
I'm working on a 3D game and I'm trying to move my object roundly. It must follow a circumference when it's moving.
I've got the following variables/function:
motionX, motionY, motionZ
posX, posY, posZ
"onupdate()" function which update the state, the position and the movement of the object
the coords of the circumference's centre
the size of the radius
How can I move this object roundly around the centre?
Is there a function in GL11 or in another library? Can you write an example?
Thanks really much,
AXELTOPOLINO
 08112011, 03:45 PM #2
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Think spherical coordinates:
x= r*cos(a)*sin(b)
y= r*sin(a)*sin(b)
z= r*cos(b)
where r is a constant value (the radius of your sphere) and both a and b move in the intervals [amin, amax] and [bmin, bmax] in a linear way.
kind regards,
JosLast edited by JosAH; 08112011 at 04:02 PM.
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 08112011, 11:12 PM #3Member
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Thanks JosAH for your reply.
What do you mean for [amin, amax] ?
 08122011, 02:23 AM #4
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That is the closed (inclusive beginning and end; i.e. not clopen) interval tor which the variable 'a' is bound.
'a' cannot be less than 'amin' [radians] and not more than 'amax' [radians].
The values are probably 0 and 2π. Jumping to 0 when reaching 2π (2π modular), and jumping to 2π + a, when a < 0
The interval should probably [actually] be clopen: [0; 2π[
(i.e. 2π is exclusive as describe 2 lines above.)Ex animo! Hibernate
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 08122011, 08:53 AM #5
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 08122011, 01:45 PM #6Member
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Really thanks, it works!
May I ask how I can do a "tornado" movement? I mean a spiral movement: a circular movement, but the radius increase and the object go up until the "top" of the tornado.
Thanks again for the great support
 08122011, 03:52 PM #7
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 08122011, 05:31 PM #8Member
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