public override bool CalculateShadow()
{
if (RingComponent == null)
{
RingCachedComponent.TryInit(this);
}
if (base.CalculateShadow() == true)
{
if (RingComponent == null)
{
return(false);
}
if (GetTexture() != null)
{
if (Helper.Enabled(RingComponent) == true)
{
InnerRadius = RingComponent.InnerRadius;
OuterRadius = RingComponent.OuterRadius;
}
var direction = default(Vector3);
var position = default(Vector3);
var color = default(Color);
Helper.CalculateLight(Light, transform.position, null, null, ref position, ref direction, ref color);
var rotation = Quaternion.FromToRotation(direction, Vector3.back);
var squash = Vector3.Dot(direction, transform.up); // Find how squashed the ellipse is based on light direction
var width = transform.lossyScale.x * OuterRadius;
var length = transform.lossyScale.z * OuterRadius;
var axis = rotation * transform.up; // Find the transformed up axis
var spin = Quaternion.LookRotation(Vector3.forward, new Vector2(-axis.x, axis.y)); // Orient the shadow ellipse
var scale = Helper.Reciprocal3(new Vector3(width, length * Mathf.Abs(squash), 1.0f));
var skew = Mathf.Tan(Helper.Acos(-squash));
var shadowT = MatrixHelper.Translation(-transform.position);
var shadowR = MatrixHelper.Rotation(spin * rotation); // Spin the shadow so lines up with its tilt
var shadowS = MatrixHelper.Scaling(scale); // Scale the ring into an oval
var shadowK = MatrixHelper.ShearingZ(new Vector2(0.0f, skew)); // Skew the shadow so it aligns with the ring plane
Matrix = shadowS * shadowK * shadowR * shadowT;
Ratio = Helper.Divide(OuterRadius, OuterRadius - InnerRadius);
return(true);
}
}
return(false);
}
