private Matrix4X4 GetCenteringTransformVisualCenter(IEnumerable <IObject3D> items, double goalRadius)
{
IEnumerable <(Vector2, Vector2, Vector2)> GetPolygons()
{
foreach (var item in items)
{
foreach (var meshItem in item.VisibleMeshes())
{
var worldMatrix = meshItem.WorldMatrix(this);
var faces = meshItem.Mesh.Faces;
var vertices = meshItem.Mesh.Vertices;
foreach (var face in faces)
{
if (face.normal.TransformNormal(worldMatrix).Z > 0)
{
yield return(
new Vector2(vertices[face.v0].Transform(worldMatrix)),
new Vector2(vertices[face.v1].Transform(worldMatrix)),
new Vector2(vertices[face.v2].Transform(worldMatrix))
);
}
}
}
}
}
var outsidePolygons = new List <List <IntPoint> >();
var projection = new Polygons();
// remove all holes from the polygons so we only center the major outlines
var polygons = OrthographicZProjection.GetClipperPolygons(GetPolygons());
foreach (var polygon in polygons)
{
if (polygon.GetWindingDirection() == 1)
{
outsidePolygons.Add(polygon);
}
}
IVertexSource outsideSource = outsidePolygons.CreateVertexStorage();
Vector2 center = outsideSource.GetWeightedCenter();
outsideSource = new VertexSourceApplyTransform(outsideSource, Affine.NewTranslation(-center));
double radius = MaxXyDistFromCenter(outsideSource);
double scale = goalRadius / radius;
var scalling = Matrix4X4.CreateScale(scale, scale, 1);
var centering = Matrix4X4.CreateTranslation(-center.X, -center.Y, 0);
return(centering * scalling);
}
