internal static void AdjustWinding(Vector2[] vertices, UInt16[] indices, WindingDir dir)
{
bool shouldFlip = false;
var length = indices.Length;
for (int i = 0; i < (length - 2); i += 3)
{
var v0 = (Vector3)vertices[indices[i]];
var v1 = (Vector3)vertices[indices[i + 1]];
var v2 = (Vector3)vertices[indices[i + 2]];
var s = (v1 - v0).normalized;
var t = (v2 - v0).normalized;
float dot = Vector3.Dot(s, t);
if (s == Vector3.zero || t == Vector3.zero || dot > 0.9999f || dot < -0.9999f)
{
continue;
}
var n = Vector3.Cross(s, t);
if (n.sqrMagnitude < 0.0001f)
{
continue;
}
shouldFlip = dir == WindingDir.CCW ? n.z <0.0f : n.z> 0.0f;
break;
}
if (shouldFlip)
{
for (int i = 0; i < (length - 2); i += 3)
{
var tmp = indices[i];
indices[i] = indices[i + 1];
indices[i + 1] = tmp;
}
}
}
public bool IsWellFormed(WindingDir correctDir)
{
if (loop.Winding == correctDir)
{
WindingDir nextDir = (correctDir == WindingDir.ccw) ? WindingDir.cw : WindingDir.ccw;
foreach (PolygonNode n in children)
{
if (!n.IsWellFormed(nextDir))
{
return(false);
}
}
return(true);
}
else
{
return(false);
}
}