Hi,
i have a nasty Problem with my Icosphere. I try to implement CDLOD. As you can see there are Holes in my Sphere. When i move the Camera inside the Sphere i can see the missing Triangles.
But i can’t find the Problem in my Code. Is there a way to tell if the Triangle facing in the wrong Direction?
I tried to find the Holes with comparing the Index. But there is no Pattern 
they change “randomly” when they get split.
That menas if Triangle x is facing the wrong Direction it can face the right Direction when i move the Camera.
I found an Implementation in OpenGl. No Problems there =/
Ignore the morph thing, it’s some other Part of my Code.
Edit: The Sphere is made of Patches, depending on the Camera distance. Each Patch contains 153 Vertices. The size of each Patch is calculated by the Camera distance.
//clear
pVertices.Empty();
pIndices.Empty();
int32 index = 0;
//Generate
int32 RC = 1 + (int32)pow(2, (int32)levels);
float delta = 1 / (float)(RC - 1);
int32 rowIdx = 0;
int32 nextIdx = 0;
for (int32 row = 0; row < RC; row++)
{
int32 numCols = RC - row;
nextIdx += numCols;
for (int32 column = 0; column < numCols; column++)
{
//calc position
FVector2D pos = FVector2D(column / (float)(RC - 1), row / (float)(RC - 1));
//calc morph
FVector2D morph = FVector2D(0, 0);
if (row % 2 == 0)
{
if (column % 2 == 1) morph = FVector2D(-delta, 0);
}
else
{
if (column % 2 == 0) morph = FVector2D(0, delta);
else morph = FVector2D(delta, -delta);
}
//create vertex
pVertices.Emplace(FPatchVertex(pos, morph));
//calc index
if (row < RC - 1 && column < numCols - 1)
{
pIndices.Emplace(rowIdx + column);
pIndices.Emplace(1 + rowIdx + column);
pIndices.Emplace(nextIdx + column);
if (column < numCols - 2)
{
pIndices.Emplace(nextIdx + column);
pIndices.Emplace(1 + rowIdx + column);
pIndices.Emplace(1 + nextIdx + column);
}
}
index++;
}
rowIdx = nextIdx;
}