Processing 1.0 - Processing Discourse - optimizing lots of iterations

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optimizing lots of iterations (Read 1120 times)

sebastiano

optimizing lots of iterations
Aug 27^th, 2009, 10:38am

Hello, i made a program that make lots of iterations, one iteration for each object in my program, the thing is that i need to put one iteration after iteration to make it work, so if i have 40 objets that means i need to have 40 blocks of iterations and thats very big!!!! , my question is , how can i just make one iteration that make the same as putting one block after other? is it possible?

here is the code for 3 objects:

Code:



  for (int i = 0; i< 1; i++){
    //object one
    gl.glPushMatrix();
    palabras[i].traslada();
    palabras[i].rota();
    model.render(0, palabras[i].numPoints);
    gl.glPopMatrix();
  } 
  
}
  
    for (int i = 1; i< 2; i++){
    //object two
    gl.glPushMatrix();
    palabras[i].traslada();
    palabras[i].rota();
    model.render(palabras[1].numPoints, palabras[1].numPoints + palabras[2].numPoints);
   gl.glPopMatrix();
  } 
  
    
    for (int i = 2; i< 3; i++){
    //object three
    gl.glPushMatrix();
    palabras[i].traslada();
    palabras[i].rota();
    model.render(palabras[2].numPoints, palabras[2].numPoints + palabras[3].numPoints);
    gl.glPopMatrix();
  }

ben_hem

Re: optimizing lots of iterations
Reply #1 - Aug 27^th, 2009, 11:38am

The loops in your code aren't really loops, since they only span one value of "i." You need to combine them into one loop that runs from 0 to 40, or whatever -- you can use values like [i+1], that should be all you need to tie it together.

for (int i=0;i<40;i++){
// do stuff with palabras[i] and palabras[i+1]
}

you may need exceptions for your first and last case, or a constrain() inside your brackets, to keep from exceeding your array length...

--Ben

sebastiano

Re: optimizing lots of iterations
Reply #2 - Aug 27^th, 2009, 2:58pm

hi i make this code, but how can i draw the first and the last objects?

thanks

Code:


for (int i=0;i<numero_objetos - 1;i++){
    gl.glPushMatrix();
    palabras[i].traslada();
    palabras[i].rota();
    model.render(palabras[i].numPoints, palabras[i].numPoints +  palabras[constrain( i + 1, 0, numero_objetos - 1) ].numPoints);
    gl.glPopMatrix();
  
}

ben_hem

Re: optimizing lots of iterations
Reply #3 - Aug 27^th, 2009, 3:02pm

If your render() script depends on referencing another object, and you can't just link the last one to the first one, then I don't know a super-elegant way. You'll probably have to either draw them outside of your loop, or include an if statement, basically:

if (this is the first or last object) render it in a special way;

--Ben

subpixel

Re: optimizing lots of iterations
Reply #4 - Aug 28^th, 2009, 1:06am

It seems to me that you ARE drawing the first object. just not the last object.

Your initial example for 3 objects referenced "palabras[3].numPoints", which doesn't exist if palabras only has 3 elements (in which case the index can only be 0, 1 or 2, not 3).

Why does the render function need the number of points of the next object? Does it internally reference the palabras array?

int intendedObjectIndex = 40; // the 41st object...
int legalObjectIndex = intendedObjectIndex % numberArrayElements;

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sebastiano

Re: optimizing lots of iterations
Reply #5 - Aug 28^th, 2009, 2:22pm

hi , thats because im using glmodel from glgraphics and i can pass the coordinates or vertices of the model to render , doing something like this:

model.render(0, 4); i can render the vertices 0 to 4 from the model , and then model.render(4, 8) ; i can render 4 to 8 vertices from the same model , so in that way i can selectively choose diferent vertices from my array to render so i can apply diferent gl transformation functions to the same model, separating the vertices.

hope that make sense

bye

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