圣诞树代码差最后一哆嗦 在线等

Question

#include <math.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#define PI 3.14159265359ffloat 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 transformPosition(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 transformLength(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) {    // Culling    {        Vec v = { 0.0f, 0.5f, 0.0f, 1.0f };        transformPosition(&v, m, v);                if (sphere(v, transformLength(m, 0.55f)) == -1.0f)            return -1.0f;    }    float z = -1.0f;    if (n == 0) { // Leaf        Vec v = { 0.0f, 0.5f, 0.0f, 1.0f };        transformPosition(&v, m, v);                z = sp;}

Answer 1

什么圣诞树，是打印一个圣诞树的图形出来吗