problem with arranging values of an array

Anyone?? I still dont have an idea how to calculate the number of the correct entry in the array. i guess i need to step thru the array by somewhat combination of the framenumber and the number of current particles, but how to do this i dont have any meanings...

cheers,
ello

no, i want to create a spline that shows the particle trails..
the positions are all there, i just need to connect them properly, and thats where my brain simply shuts down :)

I think I now understand your code, what you want to do and why it ends up like this:
You probably have an outer loop that iterates over time.
You want to have one spline per particle that trajects it's course, but with the code above you end up having one spline per timeframe, connecting all the particles at that time.

In the loop, you would need an array of splines (one for each particle), and instead of adding all points to a single spline, you would do something like this in the i loop:

 for (int i = 0; i<particleCount;i++)

               {

                    const Particle *particle = particleObject->GetParticleR(particleTag, i);

                    if (particle->bits&(PARTICLE_VISIBLE|PARTICLE_ALIVE))

                    {

                         ** add point particle->off to the end of spline i

                    }

               }

But this way, all your splines would "start" at the same time, since they don't have a time information along with them. Depends on what you're using them for whether that's what you want.



Edited by MWittav - 2010 Mar 09 at 12:05am

Well, if you want to do it with a dynamic array, how about an array of dynamic arrays, something like

Whereas I would probably just create an array of pointers to splines, add alle the points to the splines, and then add the splines to the scene. By using pointers, you don't have to worry about handing ownership of the splines over to cinema 4d when adding them to the scene.

 

 

 

 

Edited by MWittav - 2010 Mar 09 at 6:39am

I don't have my Compiler handy right now, so I might be a bit off, but when saying

tposarr[i]

what you are dealing with is a the array i, and you should be able to deal with it as though it were a normal array.
Thus,

tposarr[i].Push(..)

should work.

Also, when working on a new particle, you might need to do something like a

tposarr.push(new GeDynamicArray<Vector>)

to append a new array to your array of arrays :-)

But bear in mind the following: If a particle's life is only starting in frame 100, then the spline will (with your above code) have the value of frame 100 at position 0, frame 101 at position 1 etc., so whatever you want to do with the splines will not preserve the time. If you want for example to have an object follow the spline, you might need to keep book about each particle's lifespan.

So, depending on what you want to do, it might be a more interesting alternative to look at animation tracks instead of splines. Depends on your mission :-)

Well, if you just want the trail, without regards to thetimeline, then this should do it, even though it's probably not the most efficient algorithm, depending on how many particles you want to deal with.

As I mentioned I don't have my compiler at hand at the moment, so perhaps someone could check this. I think it should be something like

tposarr.push(new GeDynamicArray<Vector>())

(I'd say the ()'s should do it)

thank for pointing out GeAutoDynamicArray.. can you show me how to put a vector into it?

using

tposarr[i][j] = particle->off;

results in a bunch of errors so i think this is the wrong method..

thank you very much for your help

Edited by ello - 2010 Mar 10 at 12:08am

hm, still the same error..

1>c4d_plugin\resource\_api\ge_dynamicarray.h(470) : error C2440: '=': 'Vector *const *' kann nicht in 'GeDynamicArray<TYPE> *' konvertiert werden 1>        with 1>        [ 1>            TYPE=Vector 1>        ] 1>        Die Typen, auf die verwiesen wird, sind nicht verknüpft; die Konvertierung erfordert einen reinterpret_cast-Operator oder eine Typumwandlung im C- oder Funktionsformat. 1>        c4d_plugin\resource\_api\ge_dynamicarray.h(449): Bei der Kompilierung der Klassen-template der Bool GeDynamicArray<TYPE>::ReScope(VLONG)-Memberfunktion 1>        with 1>        [ 1>            TYPE=GeDynamicArray<Vector> 1>        ] 1>        c4d_plugin\resource\_api\ge_dynamicarray.h(986): Siehe Verweis auf die Instanziierung der gerade kompilierten Klassen-template "GeDynamicArray<TYPE>". 1>        with 1>        [ 1>            TYPE=GeDynamicArray<Vector> 1>        ] 1>        c4d_plugin\plugins\test\source\testobj.cpp(15): Siehe Verweis auf die Instanziierung der gerade kompilierten Klassen-template "GeAutoDynamicArray<TYPE>". 1>        with 1>        [ 1>            TYPE=GeDynamicArray<Vector> 1>        ]

what does this mean??

line15:

GeAutoDynamicArray<GeDynamicArray<Vector>> tposarr;

error comes only when i try this:

tposarr[frameNum].Push(source->GetParticleR(pt,i)->off);