#include #include float f(float x, float y, float z) { float a = x * x + 9.0f / 4.0f * 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) { 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() { for (float z = 1.5f; z > -1.5f; z -= 0.05f) { for (float x = -1.5f; x < 1.5f; x += 0.025f) { float v = f(x, 0.0f, z); if (v <= 0.0f) { float y0 = h(x, z); float ny = 0.01f; float nx = h(x + ny, z) - y0; float nz = h(x, z