curveVertex hickups on bigger Buffers?

Core Library Questions

mr.t

curveVertex hickups on bigger Buffers?

in Core Library Questions • 1 year ago

Hello,

I just stumpled into a wierd issue regarding the curveVertex.

My goal is to draw moving organic shapes into an offscreenBuffer, to get the desired resolution later for screening & printing.

What I am using is a vector shape via curvedVertex.

The funny thing is that whenever the buffer extends the normal screensize it get annoying hickups.
It looks like it "forgets" to draw polygons.

I've tried with PGraphics as well as GLgraphics. both behave the same.
The issue also seems to reproduce itself (missing the same polygons) depending on buffer-pixel-size.

Is it a bug, or is it me?
As said, whenever the buffer is smaller or same my applet size all is fine. This might somehow be linked together, or just a coincidence as i can't have a window of 3000x3000px.

I am still on processing 1.51 if that helps.

And I am also happy for any suggestions of using another method/library that will create nice bezier vector shapes for postprocessing in illustrator.

Replies(8)

demiguel...

Re: curveVertex hickups on bigger Buffers?

1 year ago

maybe if u show the code it helps...

mr.t

Re: curveVertex hickups on bigger Buffers?

1 year ago

import processing.opengl.*;
import codeanticode.glgraphics.*;

GLGraphicsOffScreen glg2;

int outPutSize = 3000;

void setup(){

size(900, 900, GLConstants.GLGRAPHICS);
glg2 = new GLGraphicsOffScreen(this, outPutSize, outPutSize,true,4);

}

void draw(){

background(0,0);

//THE SHAPE
drawVectorMask();

image(glg2.getTexture(),0,0,width,height);

}

void drawVectorMask(){

        float baseRadius = outPutSize*0.3f;

        int center=outPutSize/2;
        float offScale = baseRadius*0.75f;

        int numberOfNodes = 8;

        float[] offSet = new float[numberOfNodes];

        float[] x = new float[numberOfNodes];
        float[] y = new float[numberOfNodes];

        for(int i=0;i<numberOfNodes;i++){

           offSet[i] = sin(frameCount/40.0f*i);

            x[i] = center+(baseRadius+(offSet[i]*offScale))*sin(2*PI/numberOfNodes*i);
            y[i] = center+(baseRadius+(offSet[i]*offScale))*cos(2*PI/numberOfNodes*i);

        }

        glg2.beginDraw();

        glg2.clear(0,0);
        glg2.noStroke();

        glg2.beginShape();

        glg2.fill(0,255,100);

        //starting point for first curve
        glg2.curveVertex(x[numberOfNodes - 1], y[numberOfNodes - 1]);

        //the node curves
        for (int i = 0; i < numberOfNodes; i++) {

            glg2.curveVertex(x[i], y[i]);

        }

        //connect last with first

        glg2.curveVertex(x[0], y[0]);
        glg2.curveVertex(x[1], y[1]);

        glg2.endShape();
        glg2.endDraw();

    }

This is the example for GLGraphics Buffer. But the same effect will happen on a PGraphicsBuffer in any mode P2D / JAVA2D. So the problem must lie somewhere within a high scaled curveVertex shape.

demiguel...

Re: Re: curveVertex hickups on bigger Buffers?

1 year ago

I tried ur code and i get the same missing polygons at buffer size larger than 900x900, for less than 900 it doesnt flickr in my screen even if i am using applet size of 600x600.. my screen is 1280x800

I have noticed that after ~900 it starts to get quite slow, so it might be a problem of performance? not sure, in any case have tried saving the images to a file directly from the buffer, i mean without even displaying them in the applet? do they still show missing polygons?

mr.t

Re: curveVertex hickups on bigger Buffers?

1 year ago

Yes, strange isn't it?
Saving image without displaying does the same effect.

BUT after some more tests JAVA2D doesn't have the effect. My Mistake!

So the problem is somewhere in the P2D and the GLGraphics renderer.

Here the workaround for an GLGraphics enviroment:

GLGraphicsOffScreen glg2;
PGraphics pg;
int outPutSize = 3000;
GLTexture tex ;
void setup(){
size(900, 900, GLConstants.GLGRAPHICS);
pg = createGraphics(outPutSize, outPutSize, JAVA2D);
tex = new GLTexture(this,outPutSize,outPutSize);
}
void draw(){
background(0,0);
drawVectorMask();
tex.putImage(pg);
image(tex,0,0,width,height);
}
void drawVectorMask(){
/// ... same same .. like above just pg instead of glg2
}

demiguel...

Re: Re: curveVertex hickups on bigger Buffers?

1 year ago

great that u solved it, beautiful code btw

mr.t

Re: curveVertex hickups on bigger Buffers?

1 year ago

thanx. :)

but it is still a workaround and doesn't solve the problem if you really need to draw a curveVertex with P2D or GLGraphics.

rbrauer

Re: curveVertex hickups on bigger Buffers?

1 year ago

Use the PDF renderer to get your curves into Illustrator. http://www.processing.org/reference/beginRecord_.html

mr.t

Re: curveVertex hickups on bigger Buffers?

1 year ago

sure. but i actually need both. pixels and vectorShape.
The problem is solved by the workaround.

But it would still be interesting to know what's up there ...

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