public static Matrix4X4 GetXYInViewRotation(this WorldView world, Vector3 center)
{
var positions = new Vector3[]
{
center + new Vector3(1, 0, 0),
center + new Vector3(0, 1, 0),
center + new Vector3(-1, 0, 0),
center + new Vector3(0, -1, 0),
};
double bestX = double.NegativeInfinity;
int indexX = 0;
// get the closest z on the bottom in view space
for (int cornerIndex = 0; cornerIndex < 4; cornerIndex++)
{
Vector3 axisSide = positions[cornerIndex];
Vector3 axisSideScreenSpace = world.GetScreenSpace(axisSide);
if (axisSideScreenSpace.X > bestX)
{
indexX = cornerIndex;
bestX = axisSideScreenSpace.X;
}
}
var transform = Matrix4X4.Identity;
switch (indexX)
{
case 0:
// transform = Matrix4X4.CreateRotationZ(0);
break;
case 1:
transform = Matrix4X4.CreateRotationZ(MathHelper.Tau / 4);
break;
case 2:
transform = Matrix4X4.CreateRotationZ(-MathHelper.Tau / 2);
break;
case 3:
transform = Matrix4X4.CreateRotationZ(MathHelper.Tau * 3 / 4);
break;
}
return(transform);
}