piotoor

#include <stdio.h>
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <iterator>
#include <cstdlib>
#include <cstring>

using namespace std;

piotoor

earth_r = 6371000;  // Earth's mean radius in meters
diff = 1;
angle = 0;
a = 120;
b = 120;
h = 250;
space = 300;

translate([0, 0, -earth_r]) 
{

piotoor

earth_r = 6371000;  // Earth's mean radius in meters
diff = 1;
angle = 15;
a = 1200;
b = 1200;
h = 2500;
space = 3000;

translate([0, 0, -earth_r]) 
{

piotoor

module MeridianCircle(r, angle, pen, col)
{
    rotate([90, 0, angle])
    color(col)
    difference()
    {
        circle(r);
        circle(r - pen);
    }
}

piotoor

circle_r = 5000;
offset = 5;

$vpr=[0, 0, 340];   // Viewport rotation
$vpd = 150 + 10 * circle_r * $t * $t * $t;  // Camera distance as function of time


translate([-(circle_r + offset), 0, 0])
{
    color("blue")

piotoor

earth_r = 6371000;  // Earth's mean radius in meters
$vpr = [80, 0, 320];   // Viewport rotation
$vpd = 500 + 100000000 * $t * $t * $t;  // Camera distance as function of time

translate([0, 0, -earth_r]) 
{
    color("green")
    sphere(earth_r, $fn=1000);
    translate([0, 0, earth_r])
    {