// Called when the game starts or when spawned
void AGridV1::BeginPlay()
{
Super::BeginPlay();
int32 HalfX = GridSize.X / 2;
int32 HalfY = GridSize.Y / 2;
int32 HalfZ = GridSize.Z / 2;
FActorSpawnParameters param;
param.Owner = this;
for (int32 x = -HalfX; x < HalfX; x++)
{
for (int32 y = -HalfY; y < HalfY; y++)
{
for (int32 z = -HalfZ; z < HalfZ; z++)
{
ACellV1* cell = GetWorld()->SpawnActor<ACellV1>(FVector(x, y, z) * VoxelSize * CellSize, FRotator(), param);
cell->GridPosition = FInt3(x, y, z);
cell->Grid = this;
cell->FutureData = Async<TMap<FInt3, uint16>>(EAsyncExecution::ThreadPool, []()
{
TMap<FInt3, uint16> ret;
for (int32 i = 0; i < 32; i++)
for (int32 j = 0; j < 32; j++)
for (int32 k = 0; k < 32; k++)
ret.Add(FInt3(i, j, k), 1);
return ret;
});
cell->OngoingLoading = true;
cell->Mesh->SetMaterial(0, Material);
Data.Add(FInt3(x, y, z), cell);
}
}
}
}
return (FInt3::Scalar(BrickVertexIndex) >> FInt3(2,1,0)) & FInt3::Scalar(1);
}
// Maps face index and face vertex index to brick corner indices.
static const uint8 FaceVertices[6][4] =
{
{ 2, 3, 1, 0 }, // -X
{ 4, 5, 7, 6 }, // +X
{ 0, 1, 5, 4 }, // -Y
{ 6, 7, 3, 2 }, // +Y
{ 4, 6, 2, 0 }, // -Z
{ 1, 3, 7, 5 } // +Z
};
// Maps face index to normal.
static const FInt3 FaceNormals[6] =
{
FInt3(-1, 0, 0),
FInt3(+1, 0, 0),
FInt3(0, -1, 0),
FInt3(0, +1, 0),
FInt3(0, 0, -1),
FInt3(0, 0, +1)
};
/** An element of the vertex buffer given to the GPU by the CPU brick tessellator.
8-bit coordinates are used for efficiency. */
struct FBrickVertex
{
uint8 X;
uint8 Y;
uint8 Z;
uint8 AmbientOcclusionFactor;
