how to create transparent points in P3D mode?

Programming Questions

oatcracker

how to create transparent points in P3D mode?

in Programming Questions • 11 months ago

Hi, may I ask how to create points with alpha attribute in P3D model?

I'd like to generate a group of points with different degree of transparency according to another variable...

thanks!

Replies(4)

tfguy44

Re: how to create transparent points in P3D mode?

11 months ago

Weird, I can't seem to get points to use the stroke's alpha value... This might be intentional?

PVector[] pvs;
void setup() {
size(300, 300, P3D);
pvs = new PVector[1000];
for ( int i=0; i < pvs.length; i++) {
pvs[i] = new PVector( random(1)-.5, random(1)-.5, random(1)-.5 );
}
}
void draw() {
background(0);
translate(width/2.0, height/2.0);
rotateY(map(mouseX, 0, width, -PI, PI));
rotateX(map(mouseY, 0, height, -PI, PI));
scale(150);
stroke(255,128);
for ( int i=0; i < pvs.length; i++) {
point( pvs[i].x, pvs[i].y, pvs[i].z );
}
fill(255,0,0);
beginShape();
vertex(-.5,-.5,-.5);
vertex(.5,-.5,-.5);
vertex(.5,-.5,.5);
vertex(-.5,-.5,.5);
endShape();
noFill();
stroke(255);
box(1);
}

oatcracker

Re: how to create transparent points in P3D mode?

11 months ago

Thanks! add a strokeWeight(10) seems to make it work:

PVector[] pvs;

void setup() {
size(300, 300, P3D);
pvs = new PVector[1000];
for ( int i=0; i < pvs.length; i++) {
pvs[i] = new PVector( random(1)-.5, random(1)-.5, random(1)-.5 );
}
}

void draw() {
background(0);
translate(width/2.0, height/2.0);
rotateY(map(mouseX, 0, width, -PI, PI));
rotateX(map(mouseY, 0, height, -PI, PI));
scale(150);

strokeWeight(10);
stroke(255,100);
for ( int i=0; i < pvs.length; i++) {
point( pvs[i].x, pvs[i].y, pvs[i].z );
}
fill(255,0,0);
beginShape();
vertex(-.5,-.5,-.5);
vertex(.5,-.5,-.5);
vertex(.5,-.5,.5);
vertex(-.5,-.5,.5);
endShape();
noFill();
stroke(255);
box(1);
}

oatcracker

Re: how to create transparent points in P3D mode?

11 months ago

random tweak :

PVector[] pvs;

void setup() {
size(300, 300, P3D);
frameRate(5);
pvs = new PVector[1000];
for ( int i=0; i < pvs.length; i++) {
    pvs[i] = new PVector( random(1)-.5, random(1)-.5, random(1)-.5 );
}
}

void draw() {
background(0);
translate(width/2.0, height/2.0);
rotateY(map(mouseX, 0, width, -PI, PI));
rotateX(map(mouseY, 0, height, -PI, PI));
scale(150);

strokeWeight(5);
for ( int i=0; i < pvs.length; i++) {
    strokeWeight(random(1, 10));
    stroke(random(0, 256), random(0, 256), random(0, 256), 200);
    point( pvs[i].x, pvs[i].y, pvs[i].z );
}
fill(255, 0, 0);
beginShape();
vertex(-.5, -.5, -.5);
vertex(.5, -.5, -.5);
vertex(.5, -.5, .5);
vertex(-.5, -.5, .5);
endShape();
noFill();
stroke(255);
box(1);
}

tfguy44

Re: how to create transparent points in P3D mode?

11 months ago

Super!

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