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Distributed points on Dome / Sphere
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import org.processing.wiki.triangulate.*; | |
PShape dome; | |
float w=1200, h=1200, wd2=w/2, hd2=h/2, wdh=w/h, cx=wd2, cy=hd2, r=hd2, d=h; | |
float distToCam = 1200; //1040; //fisheye=1900, mirror=1040; | |
float globeScaler = 1.02; | |
ArrayList<PVector> points; | |
ArrayList<Triangle> triangles; | |
void settings() { | |
fullScreen(P3D); | |
} | |
void setup() { | |
surface.setSize(1200, 1200); | |
surface.setLocation(360, 0); | |
points = distributePointsOnDome(hd2); //half sphere | |
triangles = Triangulate.triangulate(points); | |
} | |
void draw() { | |
background(0); | |
perspective(atan(r/distToCam)*2, 1, distToCam, 10000); | |
camera(0, 0, -distToCam, 0, 0, 0, 0, 1, 0); | |
scale(-1, 1, 1); | |
//scale(globeScaler); | |
background(0); | |
stroke(255, 150); | |
noFill(); | |
beginShape(TRIANGLES); | |
for (Triangle t : triangles) { | |
fill(t.p1.copy().normalize().div(2).add(.5, .5, .5).setMag(255)); | |
vertex(t.p1); | |
fill(t.p2.copy().normalize().div(2).add(.5, .5, .5).setMag(255)); | |
vertex(t.p2); | |
fill(t.p3.copy().normalize().div(2).add(.5, .5, .5).setMag(255)); | |
vertex(t.p3); | |
} | |
endShape(); | |
for (PVector v : points) { | |
pushMatrix(); | |
orientateOnSphere(v); | |
fill(255); | |
noStroke(); | |
hint(DISABLE_DEPTH_TEST); | |
hint(DISABLE_OPTIMIZED_STROKE); | |
ellipse(0, 0, 30, 30); | |
PVector s = screen(); | |
popMatrix(); | |
if (v.z==0) { //make more visible! | |
ellipse(lerp(s.x-wd2, 0, .025), lerp(s.y-hd2, 0, .025), 50, 50); | |
} | |
} | |
} | |
ArrayList<PVector> distributePointsOnDome(float radius) { | |
ArrayList<PVector> v = new ArrayList(); | |
int n[] = {1, 6, 12, 24, 24, 24, 24}; | |
int res = n.length; | |
for (int i=0; i<res; i++) { | |
float r = sin(float(i)/(res-1)*HALF_PI) * radius; | |
for (int j=0; j<n[i]; j++) { | |
float a = float(j)/n[i] * TWO_PI; | |
float x = cos(a) * r; | |
float y = sin(a) * r; | |
float z = r>=radius ? 0 : sqrt(radius*radius-(x*x)-(y*y)); | |
v.add(new PVector(x, y, z)); | |
} | |
} | |
return v; | |
} |
Author
companje
commented
Nov 23, 2019
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