3D dashed lines into PDF

Core Library Questions

trzewiczek

in Core Library Questions • 3 months ago

Hi,

I'm working on the little project with three requirements:

1. dashed lines have to be made of dashed baziers/curves (not collection of little lines)

2. these dashed beziers have to be drawn in 3D

3. they have to be exported as dashed beziers into PDF file

The example output is here:

I managed these combinations:

1. dashed lines (via BasicStroke) in 2D with export to SVG (no good)

2. non-dashed lines in 3D with export to PDF but not as separate lines (no good)

Is it anyhow possible in Processing or should I use some other technology (if so, what technology should I use then).

Thanks for help in advance,

trzewiczek

Replies(2)

tfguy44

Re: 3D dashed lines into PDF

3 months ago

3D beziers are easy to do in Processing. Here's one:

void setup(){
size(400,400,P3D);
strokeWeight(2);
smooth();
}
void draw(){
background(0);
translate(width/2,height/2,-200);
scale(150);
noFill();
stroke(255);
rotateY(map(mouseX,0,width,-PI,PI));
rotateX(map(mouseY,0,height,-PI,PI));
box(2);
stroke(255,255,0);
bezier(1,1,1, 1,0,0, .5,3,1, -1,-1,-1);
}

I think the problem you're having is that you're trying to draw 20 long bezier lines that are dashed, but that's not what your requirements say you should do! Each "line" you see is it's OWN bezier curve. So you'll be drawing about 440 of them... The proof of this is that if it were one long dashed line, it wouldn't be a bezier curve, because it has more that one curve to it (it'd look like a sin wave)!

trzewiczek

Re: 3D dashed lines into PDF

3 months ago

Thx for the answer. The problems are:

1. making the curve/bezier dashed (glLineStipple doesn't wirk for some reason)

2. exporting it to PDF, because when you export your code (with beginRow) the bezier comes as a collection of multiple straight lines and not a single path.

Any ideas how to solve it?

BTW: the picture above is generated in P2D (with BasicStroke for dashed lines) and then 3D manipulated in Illustrator (should be done from code). So each sinusoid is a collection of bezierVertices. It works fine with 2D and SVG export but doesn't work with both 2D/PDF export and 3D/PDF export.

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