public static Vector2 ComputeTexCoord <T>(this T vertex, Vector3 trileSize) where T : ILitVertex, ITexturedVertex
{
FaceOrientation orientation = FezMath.OrientationFromDirection(vertex.Normal);
Vector2 vector2;
switch (orientation)
{
case FaceOrientation.Left:
vector2 = new Vector2(0.375f, 0.0f);
break;
case FaceOrientation.Back:
vector2 = new Vector2(0.375f, 0.0f);
break;
case FaceOrientation.Right:
vector2 = new Vector2(0.25f, 0.0f);
break;
case FaceOrientation.Top:
vector2 = new Vector2(0.5f, 0.0f);
break;
case FaceOrientation.Front:
vector2 = Vector2.Zero;
break;
default:
vector2 = new Vector2(0.625f, 0.0f);
break;
}
Vector3 b = ((Vector3.One - FezMath.Abs(vertex.Normal)) * vertex.Position / trileSize * 2f + vertex.Normal) / 2f + new Vector3(0.5f);
float num1 = FezMath.Dot(FezMath.RightVector(FezMath.AsViewpoint(orientation)), b);
float num2 = FezMath.Dot(FezMath.UpVector(FezMath.AsViewpoint(orientation)), b);
if (orientation != FaceOrientation.Top)
{
num2 = 1f - num2;
}
return(new Vector2(vector2.X + num1 / 8f, vector2.Y + num2));
}