LL_VECTOR3D ll_sunPos;
VECTOR temp;
...
vec_set(temp,vector(sunEnt.x,sunEnt.y,sunEnt.z));
ll_vec3d_set(&ll_sunPos, &temp); // using address operators is necessary here

#include <acknex.h>
#include <default.c>

#include "vec3d.c";


VECTOR vec1;
VECTOR vec2;
VECTOR vec3;

VECTOR temp;

LL_SPHERE sphere;
LL_LINE3D line;

STRING* toWrite = "#30";

int isIntersecting = OFF;

var radius = 100;

VECTOR center;

void draw_circle(VECTOR* pos, var radius)
{
	var angle = 0;
			vec_set(temp,vector(radius*cos(angle),radius*sin(angle),0));
		vec_add(temp,center);
	draw_line(temp,NULL,0);
	draw_line(temp,vector(255,255,255),100);
	
	while(angle <= 360)
	{
		vec_set(temp,vector(radius*cos(angle),radius*sin(angle),0));
		vec_add(temp,center);
		draw_line(temp,vector(255,255,255),100);
		angle += 10;
	}
}

void draw_info()
{
	while(1)
	{
		str_for_num(toWrite,vec1.x);
		draw_text(toWrite,20,20,vector(255,255,255));
		str_for_num(toWrite,vec1.y);
		draw_text(toWrite,20,40,vector(255,255,255));
		str_for_num(toWrite,vec1.z);
		draw_text(toWrite,20,60,vector(255,255,255));
		
		str_for_num(toWrite,vec2.x);
		draw_text(toWrite,20,80,vector(255,255,255));
		str_for_num(toWrite,vec2.y);
		draw_text(toWrite,20,100,vector(255,255,255));
		str_for_num(toWrite,vec2.z);
		draw_text(toWrite,20,120,vector(255,255,255));
		
		str_for_num(toWrite,vec3.x);
		draw_text(toWrite,20,140,vector(255,255,255));
		str_for_num(toWrite,vec3.y);
		draw_text(toWrite,20,160,vector(255,255,255));
		str_for_num(toWrite,vec3.z);
		draw_text(toWrite,20,180,vector(255,255,255));
				str_for_num(toWrite,mouse_pos.x);
		draw_text(toWrite,20,280,vector(255,255,255));
				str_for_num(toWrite,mouse_pos.y);
		draw_text(toWrite,20,300,vector(255,255,255));
		
		if(isIntersecting)
		draw_text("Intersect",20,200,vector(255,255,255));
		else
		draw_text("Don't intersect",20,200,vector(255,255,255));
		
		vec_set(temp,vec2);vec_add(temp,center);
		
		draw_line(temp,NULL,100);
		draw_line(temp,vector(255,255,255),100);
		
		vec_set(temp,vec3);vec_add(temp,center);
		draw_line(temp,vector(255,255,255),100);
		
		draw_circle(vec1,radius);
		wait(1);
	}
}


void setfirst()
{
	vec2.x = mouse_pos.x - center.x;
	vec2.y = mouse_pos.y - center.y;
}

void setsecond()
{
	vec3.x = mouse_pos.x - center.x;
	vec3.y = mouse_pos.y - center.y;
}


void main()
{
	vec_set(vec1,vector(0,0,0));
	vec_set(vec2,vector(0,0,0));
	vec_set(vec3,vector(0,0,0));
	vec_set(center,vector(screen_size.x/2,screen_size.y/2,0));
	
	mouse_mode = 4;

	on_mouse_left = setfirst;
	on_mouse_right = setsecond;


	draw_info();

	while(1)
	{
		radius += mickey.z*time_step*5;
		sphere.pos.x = vec1.x;sphere.pos.y = vec1.y;sphere.pos.z = vec1.z;
		sphere.radius = radius;
		line.from.x = vec2.x;line.from.y = vec2.y;line.from.z = vec2.z;
		line.to.x = vec3.x;line.to.y = vec3.y;line.to.z = vec3.z;
		
		isIntersecting = ll_vec3d_lineSphereIntersect(line, sphere);
		wait(1);
	}
}