c语言旋转矩阵

① c璇瑷鐜鐟拌姳绋嫔簭

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C璇瑷缁桦埗鐜鐟拌姳锲炬堢殑绠瑕佹傝堪

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mat3 rotationXY(float x, float y) {
vec2 c, s = {sin(x), sin(y)};
mat3 m = {
c.y, 0.0f, -s.y,
s.y * s.x, c.x, c.y * s.x,
s.y * c.x, -s.x, c.y * c.x
};
return m;
}

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vec3 ray_dir(float fov, vec2 pos) {
vec3 r = {pos.x, pos.y, -tan((90.0 - fov * 0.5) * DEG_TO_RAD)};
return normalize3(r);
}

float f(vec2 fragCoord) {
vec3 dir = ray_dir(45.0, fragCoord);
vec3 eye = {0.0f, 0.0f, 4.5f};
dir = mul(rotationXY(angle, pitch), dir);
eye = mul(rotationXY(angle, pitch), eye);
float depth = ray_marching(eye, dir, 0.0, clip_far);
if (depth >= clip_far) return 0.0f;
return shading(pos, gradient(pos), eye);
}

int main() {
for (int y = 0; y < 80; y++) {
for (int x = 0; x < 160; x++) {
char pixel = " .,-:;+=*#@"[(int)(f(make2((x / 160.0 - 0.5) * 2.0f, (y / 80.0 - 0.5f) * -2.0f)) * 12.0f)];
printf("%c", pixel);
}
printf(" ");
}
}

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② c语言 旋转矩阵算法

#include <stdlib.h>
#include <stdio.h>
#define N 5

int min(int a,int b,int c,int d)
{
a=a<b?a:b;
a=a<c?a:c;
a=a<d?a:d;
return a;
}

int main()
{
int arr[N][N],i,j;
for(i=0;i<N;i++)
{
for(j=0;j<N;j++)
{
arr[i][j]=min(i,j,N-1-i,N-1-j);
printf("%d ",arr[i][j]);
}
printf("\n");
}
system("pause");
return 0;
}