#include <stdio.h> #include <math.h> #include <windows.h> #include <tchar.h>

float f(float x, float y, float z) { float a = xx + 9.0f/4.0fyy + zz - 1; return aaa - xxzzz - 9.0f/80.0fyyzz*z; }

float h(float x, float z) { for(float y = 1.0f; y >= 0.0f; y -= 0.001f) if(f(x, y, z) <= 0.0f) return y; return 0.0f; }

int main() { HANDLE o = GetStdHandle(STD_OUTPUT_HANDLE); _TCHAR buffer[25][80] = { _T(' ') }; _TCHAR ramp[] = _T(".:-=+*#%@");

for(float t = 0.0f;; t += 0.1f) {
    int sy = 0;
    float s = sinf(t);
    float a = s*s*s*s*0.2f;
    
    for(float z = 1.3f; z > -1.2f; z -= 0.1f) {
        _TCHAR* p = &buffer[sy++][0];
        float tz = z*(1.2f - a);
        
        for(float x = -1.5f; x < 1.5f; x += 0.05f) {
            float tx = x*(1.2f + a);
            float v = f(tx, 0.0f, tz);
            if(v <= 0.0f) {
                float y0 = h(tx, tz);
                float ny = 0.01f;
                float nx = h(tx + ny, tz) - y0;
                float nz = h(tx, tz + ny) - y0;
                float nd = 1.0f/sqrtf(nx*nx + ny*ny + nz*nz);
                float d = (nx + ny - nz)*nd*0.5f + 0.5f;
                *p++ = ramp[(int)(d*5.0f)];
            }
            else *p++ = ' ';
        }
    }
    
    for(int y = 0; y < 25; y++) {
        COORD coord = {0, y};
        SetConsoleCursorPosition(o, coord);
        WriteConsole(o, buffer[y], 80, NULL, NULL);
    }
    Sleep(30);
}

}