public static RenderGeometry CreateCuboctahedronGeometry(float size, float ratio)
{
if (ratio <= 0)
{
return(CreateTetrahedronGeometry(size, 1));
}
if (ratio >= 1)
{
RenderGeometry result = CreateTetrahedronGeometry(size, 1);
result.ApplyRotation(Quaternion.AngleAxis(90, Vector3.up));
return(result);
}
RenderGeometry geometry = new RenderGeometry();
var corners = new Dictionary <IntVector3, Vertex>();
foreach (var symmetry in Symmetry.SymmetryGroup("110"))
{
IntVector3 key = symmetry.Apply(Key(1, 1, 0));
Vector3 position = symmetry.Apply(Vec(1, 1, (1 - ratio * 2) * (symmetry.isNegative ? -1 : 1)) * (size / 2));
corners[key] = geometry.CreateVertex(position);
}
foreach (IntVector3[] keys in Combine(
FaceSymmetryGroup("100", Key(1, 0, -1), Key(1, 1, 0), Key(1, 0, 1), Key(1, -1, 0)),
FaceSymmetryGroup("111", Key(1, 1, 0), Key(0, 1, 1), Key(1, 0, 1))))
{
geometry.CreateFace(keys.Select(key => corners[key]).ToArray());
}
return(geometry);
}
public static RenderGeometry CreateTetrahedronToTetrahedronTransitionGeometry(float size, float ratio, bool cutEdge)
{
if (cutEdge)
{
return(CreateCuboctahedronGeometry(size, ratio));
}
if (ratio <= 0.5f)
{
return(CreateTrunctedTetrahedronGeometry(size, ratio * 2));
}
else
{
RenderGeometry geometry = CreateTrunctedTetrahedronGeometry(size, (1 - ratio) * 2);
geometry.ApplyRotation(Quaternion.AngleAxis(90, Vector3.up));
return(geometry);
}
}