public void GetPositionParams(ref Vector3 pos, float lodSize, out MaterialSampleParams ps, bool skipCache = false)
{
Vector3 localPosition = pos - m_planetShape.Center();
ps.DistanceToCenter = localPosition.Length();
ps.LodSize = lodSize;
if (ps.DistanceToCenter < 0.01f)
{
ps.SurfaceDepth = 0;
ps.Gravity = Vector3.Down;
ps.Latitude = 0;
ps.Longitude = 0;
ps.Texcoord = Vector2.One / 2;
ps.Face = 0;
ps.Normal = Vector3.Backward;
ps.SampledHeight = 0;
return;
}
ps.Gravity = localPosition / ps.DistanceToCenter;
MyCubemapHelpers.CalculateSampleTexcoord(ref localPosition, out ps.Face, out ps.Texcoord);
// this guarantess texcoord in [0,1)
if (skipCache)
{
ps.SampledHeight = m_planetShape.GetValueForPosition(ps.Face, ref ps.Texcoord, out ps.Normal);
}
else
{
ps.SampledHeight = m_planetShape.GetValueForPositionWithCache(ps.Face, ref ps.Texcoord, out ps.Normal);
}
ps.SurfaceDepth = m_planetShape.SignedDistanceWithSample(lodSize, ps.DistanceToCenter, ps.SampledHeight) * ps.Normal.Z;
ps.Latitude = ps.Gravity.Y;
Vector2 lon = new Vector2(-ps.Gravity.X, -ps.Gravity.Z);
lon.Normalize();
ps.Longitude = lon.Y;
if (-ps.Gravity.X > 0)
{
ps.Longitude = 2 - ps.Longitude;
}
}
