最近画圣诞树好卷，我也来一个豪华版的裸眼3d圣诞树，这个用vs和vc都可以实现，把代码改成绿色或者用codeblocks效果会更好哦！先看看效果图

 下面是代码

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include<string.h>
#define PI 3.14159265359
float sx, sy;

typedef float Mat[4][4];
typedef float Vec[4];

void scale(Mat* m, float s) {
	Mat temp = { {s,0,0,0},{0,s,0,0},{0,0,s,0},{0,0,0,1} };
	memcpy(m, &temp, sizeof(Mat));
}

void rotateY(Mat* m, float t) {
	float c = cosf(t), s = sinf(t);
	Mat temp = { {c,0,-s,0},{0,1,0,0},{-s,0,c,0},{0,0,0,1} };
	memcpy(m, &temp, sizeof(Mat));
}

void rotateZ(Mat* m, float t) {
	float c = cosf(t), s = sinf(t);
	Mat temp = { {c,-s,0,0},{s,c,0,0},{0,0,1,0},{0,0,0,1} };
	memcpy(m, &temp, sizeof(Mat));
}

void translate(Mat* m, float x, float y, float z) {
	Mat temp = { {1,0,0,x},{0,1,0,y},{0,0,1,z},{0,0,0,1} };
	memcpy(m, &temp, sizeof(Mat));
}

void mul(Mat* m, Mat a, Mat b) {
	Mat temp;
	for (int j = 0; j < 4; j++)
		for (int i = 0; i < 4; i++) {
			temp[j][i] = 0.0f;
			for (int k = 0; k < 4; k++)
				temp[j][i] += a[j][k] * b[k][i];
		}
	memcpy(m, &temp, sizeof(Mat));
}

void translatemPosition(Vec* r, Mat m, Vec v) {
	Vec temp = { 0,0,0,0 };
	for (int j = 0; j < 4; j++)
		for (int i = 0; i < 4; i++)
			temp[j] += m[j][i] * v[i];
	memcpy(r, &temp, sizeof(Vec));
}

float translatemLength(Mat m, float r) {
	return sqrtf(m[0][0] * m[0][0] + m[0][1] * m[0][1] + m[0][2] * m[0][2]) * r;
}

float sphere(Vec c, float r) {
	float dx = c[0] - sx, dy = c[1] - sy;
	float a = dx * dx + dy * dy;
	return a < r* r ? sqrtf(r * r - a) + c[2] : -1.0f;
}

float opUnion(float z1, float z2) {
	return z1 > z2 ? z1 : z2;
}

float f(Mat m, int n) {
	float z = -1.0f;
	for (float r = 0.0f; r < 0.8f; r += 0.02f) {
		Vec v = { 0.0f,r,0.0f,1.0f };
		translatemPosition(&v, m, v);
		z = opUnion(z, sphere(v, translatemLength(m, 0.05f * (0.95f - r))));
	}

	if (n > 0) {
		Mat ry, rz, s, t, m2, m3;
		rotateZ(&rz, 1.8f);

		for (int p = 0; p < 6; p++) {
			rotateZ(&ry, p * (2 * PI / 6));
			mul(&m2, ry, rz);
			float ss = 0.45f;
			for (float r = 0.2f; r < 0.8f; r += 0.1f) {
				scale(&s, ss);
				translate(&t, 0.0f, r, 0.0f);
				mul(&m3, s, m2);
				mul(&m3, t, m3);
				mul(&m3, m, m3);
				z = opUnion(z, f(m3, n - 1));
				ss *= 0.8f;
			}
		}
	}

	return z;
}

float f0(float x, float y, int n) {
	sx = x;
	sy = y;
	Mat m;
	scale(&m, 1.0f);
	return f(m, n);
}

int main(int argc, char* argv[]) {
	int n = argc > 1 ? atoi(argv[1]) : 3;
	float zoom = argc > 2 ? atof(argv[2]) : 1.0f;
	for (float y = 0.8f; y > -0.0f; y -= 0.02f / zoom, putchar('\n'))
		for (float x = -0.35f; x < 0.35f; x += 0.01f / zoom) {
			float z = f0(x, y, n);
			if (z > -1.0f) {
				float nz = 0.001f;
				float nx = f0(x + nz, y, n) - z;
				float ny = f0(x, y + nz, n) - z;
				float nd = sqrtf(nx * nx + ny * ny + nz * nz);
				float d = (nx - ny + nz) / sqrtf(3) / nd;
				d = d > 0.0f ? d : 0.0f;
				putchar(".-:=+*#%@@"[(int)(d * 9.0f)]);
			}

			else
				putchar(' ');
		}
}

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