Le 21/10/2013 23:24, rodv92 a écrit :
> Hello group, i need your help. i am trying to move CSG objects along a curve.
> That's easy, but the problem here is i dont want any gaps between the objects.
> 
> So, it will involve some trigonometric operations.
> imagine you have a box and you see it from above.
> rotation are about the y axis
> 
> first you have to rotate it at origin multiplied by the while control variable
> (magsec in my example).
> Next i will translate it so as the right down side of the box will just touch
> the previous box edge.
> 
> the left side will merge with the previous box some more, so there will be no
> gap.
> 
> the object is 55.88 wide and 44 depth.
> 
> the uncorrected translate after the rotate will be 44*magsec. then you have to
> back it a bit along the z axis to remove the gap.
> 
> I figured that it will be a z translate of tan(angle)*55.88/2
> 
> Next you will have to move along the x axis to make the whole path curved
> 
> I figured that it will be a x translate of sin(angle)*44
> 
> But these vectors will be affected by the rotation along the curve so I thought
> that i will need to vrotate them, and add the cumulatively.
> 
> So here is the SDL :

> Please help me find the problem, or if you know a better algorithm.
> 
> Thank you.
> 
> 
Assuming it is something similar to wagons of a train on a railway, I
would model the railway as a spline, use the magsec as the time index of
the position of the head of the first wagon (so evaluating the spline at
magsec provide the position of the head of the first wagon),
then use a bisecting algorithm to compute magsec2 so that the distance
between the position of magsec2 and magsec match your constraint.

And so on for all other wagons.


-- 
Just because nobody complains does not mean all parachutes are perfect.

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