private static void CreateVertices(List <Segment> segments, int segIndex, float u, GeneratingModel model, List <int> output, out int wrapPoint)
{
var seg = segments[segIndex];
output.Clear();
for (int i = 0; seg.Rotation0Fraction + seg.RotationStepFraction * i < 1; ++i)
{
var frac = seg.Rotation0Fraction + seg.RotationStepFraction * i;
var pos = CalculatePosition(seg, frac);
var rdx = model.AddRDV(new ModelVertex
{
Position = pos,
Normal = CalculateNormal(segments, segIndex, frac, false),
UV = new Vector2(u, frac),
});
output.Add(rdx);
}
if (seg.Rotation0Fraction != 0)
{
if (output.Count < 2)
{
throw new ArgumentException("Invalid segment");
}
var pos = (model.rdv[output[0]].Position + model.rdv[output[output.Count - 1]].Position) / 2;
var rdx = model.AddRDV(new ModelVertex
{
Position = pos,
Normal = CalculateNormal(segments, segIndex, 0, false),
UV = new Vector2(u, 0),
});
output.Add(rdx);
}
if (output.Count == 1)
{
wrapPoint = -1;
//Move v to 0.5
var rtv = model.rdv[output[0]];
rtv.UV.Y = 0.5f;
model.rdv[output[0]] = rtv;
}
else
{
var zero = output.Where(ii => model.rdv[ii].UV.Y == 0).First();
var rdx = model.AddRDV(new ModelVertex
{
Position = model.rdv[zero].Position,
Normal = model.rdv[zero].Normal,
UV = new Vector2(u, 1),
});
wrapPoint = rdx;
}
}
private static void CloneVertices(List <Segment> segments, int segIndex, GeneratingModel model, List <int> output, ref int wrapPoint)
{
var input = output.ToArray();
output.Clear();
var seg = segments[segIndex];
bool wrapProcessed = false;
for (int i = 0; i < input.Length; ++i)
{
var rdv = model.rdv[input[i]];
var deg = seg.Rotation0Fraction + seg.RotationStepFraction * i;
if (deg >= 1)
{
if (i != input.Length - 1)
{
continue; //should never happen
}
deg = 0;
}
rdv.Normal = CalculateNormal(segments, segIndex, deg, true);
output.Add(model.AddRDV(rdv));
if (rdv.UV.Y == 0 && wrapPoint != -1)
{
if (wrapProcessed)
{
throw new Exception();
}
var rdv2 = new ModelVertex
{
Position = model.rdv[wrapPoint].Position,
Normal = rdv.Normal,
UV = model.rdv[wrapPoint].UV,
};
wrapPoint = model.AddRDV(rdv2);
wrapProcessed = true;
}
}
if (!wrapProcessed && wrapPoint != -1)
{
throw new Exception();
}
}