public static void GetShapeMeshData(EntityCollidable collidable, List<VertexPositionNormalTexture> vertices, List<ushort> indices)
{
var wrappedShape = collidable.Shape as WrappedShape;
if (wrappedShape == null)
throw new ArgumentException("Wrong shape type");
var points = new List<Vector3>();
Vector3 max;
var direction = new Vector3();
float angleChange = MathHelper.TwoPi / NumSamples;
for (int i = 1; i < NumSamples / 2 - 1; i++)
{
float phi = MathHelper.PiOver2 - i * angleChange;
var sinPhi = (float)Math.Sin(phi);
var cosPhi = (float)Math.Cos(phi);
for (int j = 0; j < NumSamples; j++)
{
float theta = j * angleChange;
direction.X = (float)Math.Cos(theta) * cosPhi;
direction.Y = sinPhi;
direction.Z = (float)Math.Sin(theta) * cosPhi;
wrappedShape.GetLocalExtremePoint(direction, out max);
points.Add(max);
}
}
wrappedShape.GetLocalExtremePoint(Toolbox.UpVector, out max);
points.Add(max);
wrappedShape.GetLocalExtremePoint(Toolbox.DownVector, out max);
points.Add(max);
var hullTriangleVertices = new List<Vector3>();
var hullTriangleIndices = new List<int>();
ConvexHullHelper.GetConvexHull(points, hullTriangleIndices, hullTriangleVertices);
//The hull triangle vertices are used as a dummy to get the unnecessary hull vertices, which are cleared afterwards.
hullTriangleVertices.Clear();
foreach (int i in hullTriangleIndices)
{
hullTriangleVertices.Add(points[i]);
}
for (ushort i = 0; i < hullTriangleVertices.Count; i += 3)
{
Vector3 normal = Vector3.Normalize(Vector3.Cross(hullTriangleVertices[i + 2] - hullTriangleVertices[i], hullTriangleVertices[i + 1] - hullTriangleVertices[i]));
vertices.Add(new VertexPositionNormalTexture(hullTriangleVertices[i], normal, new Vector2(0, 0)));
vertices.Add(new VertexPositionNormalTexture(hullTriangleVertices[i + 1], normal, new Vector2(1, 0)));
vertices.Add(new VertexPositionNormalTexture(hullTriangleVertices[i + 2], normal, new Vector2(0, 1)));
indices.Add(i);
indices.Add((ushort)(i + 1));
indices.Add((ushort)(i + 2));
}
}
}
