- #include <stdio.h>
- #include <math.h>
- 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 + ny) - y0;
- float nd = 1.0f / sqrtf(nx * nx + ny * ny + nz * nz);
- float d = (nx + ny - nz) * nd * 0.5f + 0.5f;
- putchar(".:-=+*#%@"[(int)(d * 5.0f)]);
- }
- else
- putchar(' ');
- }
- putchar('\n');
- }
- }
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