C++ - 浮点数组在某个非常大的索引之后不存储值

在我的程序中，我正在使用柏林噪声创建地形。地形正在正确生成，现在我正在尝试将计算出的法线存储到称为法线的浮点数组中。它正确地将法线存储到某个索引，但随后它只存储 0。这是我的代码：

float frequency = 8;
float flagVertices[ N*N*VALS_PER_VERT*VERTICES_PER_QUAD ];
float normals[ N*N*VALS_PER_VERT*VERTICES_PER_QUAD ];
int idxFlag = 0;
int normFlag = 0;
for (int i=0;i < N;i++){
for (int j=0;j < N;j++){
// *** Face 1 ***
// (0,0)
flagVertices[idxFlag++] = (float)i/N;
flagVertices[idxFlag++] = 0.2f*PerlinNoise( glm::vec2( (float)i/N*frequency, (float)j/N*frequency ) );
flagVertices[idxFlag++] = (float)j/N;
glm::vec3 p0 = glm::vec3(flagVertices[idxFlag-3], flagVertices[idxFlag-2], flagVertices[idxFlag-1]);                
// (0,1)
flagVertices[idxFlag++] = (float)i/N;
flagVertices[idxFlag++] = 0.2f*PerlinNoise( glm::vec2( (float)i/N*frequency, (float)(j+1)/N*frequency ) );
flagVertices[idxFlag++] = (float)(j+1)/N; 
glm::vec3 p1 = glm::vec3(flagVertices[idxFlag-3], flagVertices[idxFlag-2], flagVertices[idxFlag-1]); 
// (1,1)
flagVertices[idxFlag++] = (float)(i+1)/N;
flagVertices[idxFlag++] = 0.2f*PerlinNoise( glm::vec2( (float)(i+1)/N*frequency, (float)(j+1)/N*frequency ) );
flagVertices[idxFlag++] = (float)(j+1)/N; 
glm::vec3 p2 = glm::vec3(flagVertices[idxFlag-3], flagVertices[idxFlag-2], flagVertices[idxFlag-1]);
// Adding in normals
glm::vec3 normal = glm::abs(glm::triangleNormal(p0,p1,p2));
normals[normFlag++] = normal.x;
normals[normFlag++] = normal.y;
normals[normFlag++] = normal.z;
// *** Face 2 ***
// (1,1)
flagVertices[idxFlag++] = (float)(i+1)/N;
flagVertices[idxFlag++] = 0.2f*PerlinNoise( glm::vec2( (float)(i+1)/N*frequency, (float)(j+1)/N*frequency ) );
flagVertices[idxFlag++] = (float)(j+1)/N;
glm::vec3 p3 = glm::vec3(flagVertices[idxFlag-3], flagVertices[idxFlag-2], flagVertices[idxFlag-1]); 
// (1,0)
flagVertices[idxFlag++] = (float)(i+1)/N;
flagVertices[idxFlag++] = 0.2f*PerlinNoise( glm::vec2( (float)(i+1)/N*frequency, (float)j/N*frequency ) );
flagVertices[idxFlag++] = (float)j/N;
glm::vec3 p4 = glm::vec3(flagVertices[idxFlag-3], flagVertices[idxFlag-2], flagVertices[idxFlag-1]); 
// (0,0)
flagVertices[idxFlag++] = (float)i/N;
flagVertices[idxFlag++] = 0.2f*PerlinNoise( glm::vec2( (float)i/N*frequency, (float)j/N*frequency ) );
flagVertices[idxFlag++] = (float)j/N;
glm::vec3 p5 = glm::vec3(flagVertices[idxFlag-3], flagVertices[idxFlag-2], flagVertices[idxFlag-1]);
// Adding in normals
normal = glm::abs(glm::triangleNormal(p3,p4,p5));
normals[normFlag++] = normal.x;
normals[normFlag++] = normal.y;
normals[normFlag++] = normal.z;
}
}

我确定这是一个C++问题，因为我在创建后尝试打印出法线，但我没有看到 0。但是当我从数组中打印出法线(使用正确的索引(时，我只得到 0。