Heart3D.c

#include<stdio.h>
#include<windows.h>
#include<math.h>
float f(float x, float y, float z){
    float a;
    a=x*x+9.0f/4.0*y*y+z*z-1;
    return a*a*a-x*x*z*z*z-9.0f/80.0f*y*y*z*z*z;
}
float h(float x,float z){
    float y;
    for(y=1.0f;y>=0.0f;y-=0.001f)
    if(f(x,y,z)<=0.0f)
    return y;
    return 0.0f;
}
void heart3d(){
    system("color f4");
    float z,x,v,y0,ny,nx,nz,nd,d;
    for(z=1.5f;z>-1.5f;z-=0.05f){
        for(x=-1.5f;x<1.5f;x+=0.025f){
            v=f(x,0.0f,z);
            if(v<=0.0f){
                y0=h(x,z);
                ny=0.01f;
                nx=h(x+ny,z)-y0;
                nz=h(x,z+ny)-y0;
                nd=1.0f/sqrtf(nx*nx+ny*ny+nz*nz);
                d=(nx+ny-nz)*nd*0.5f+0.5f;
                putchar(".:-=+*#%@"[(int)(d*5.0f)]);
            }
            else putchar(' ');
        }
        putchar('\n');
    }
}
void main(){
    heart3d();
}