3D Scenes - Game Coding Complete - page 557

Vec3 edge1 = triangle[1]-triangle[0];
Vec3 edge2 = triangle[2]-triangle[0];
Vec3 normal;
normal = edge1.Cross(edge2);
normal.Normalize();
Mat4x4 rotY;
rotY.BuildRotationY(D3DX_PI/2.0f);
Mat4x4 rotX;
rotX.BuildRotationX(-D3DX_PI/2.0f);
m_sides = 5;
for (DWORD side = 0; side < m_sides; side++)
{
for (DWORD v = 0; v < 4; v++)
{
Vec4 temp;
if (side < m_sides-1)
{
temp = rotY.Xform(Vec3(skyVerts[v].Pos));
}
else
{
skyVerts[0].Uv = Vec2(1.0f, 1.0f);
skyVerts[1].Uv = Vec2 (1.0f, 1.0f);
skyVerts[2].Uv = Vec2 (1.0f, 1.0f);
skyVerts[3].Uv = Vec2 (1.0f, 1.0f);
temp = rotX.Xform(Vec3(skyVerts[v].Pos));
}
skyVerts[v].Pos = Vec3(temp.x, temp.y, temp.z);
}
memcpy(&pVertices[side*4], skyVerts, sizeof(skyVerts));
}
D3D11_BUFFER_DESC bd;
ZeroMemory( &bd, sizeof(bd) );
bd.Usage = D3D11_USAGE_DEFAULT;
bd.ByteWidth = sizeof( D3D11Vertex_UnlitTextured ) * m_numVerts;
bd.BindFlags = D3D11_BIND_VERTEX_BUFFER;
bd.CPUAccessFlags = 0;
D3D11_SUBRESOURCE_DATA InitData;
ZeroMemory( &InitData, sizeof(InitData) );
InitData.pSysMem = pVertices;