private MyRuntimeEnvironmentItemInfo GetItemForPosition(ref MySurfaceParams surface, int lod)
{
var key = new MyBiomeMaterial(surface.Biome, surface.Material);
m_candidates.Clear();
List <MyEnvironmentItemMapping> ruleset;
if (m_environment.MaterialEnvironmentMappings.TryGetValue(key, out ruleset))
{
foreach (var rule in ruleset)
{
var sampler = rule.Sampler(lod);
if (sampler != null && rule.Rule.Check(surface.HeightRatio, surface.Latitude, surface.Longitude, surface.Normal.Z))
{
m_candidates.Add(sampler);
}
}
}
var seed = surface.Position.GetHashCode();
float sample = MyHashRandomUtils.UniformFloatFromSeed(seed);
switch (m_candidates.Count)
{
case 0:
return(null);
case 1:
return(m_candidates[0].Sample(sample));
default:
return(m_candidates[(int)(MyHashRandomUtils.UniformFloatFromSeed(~seed) * m_candidates.Count)].Sample(sample));
}
}
/**
* All mighty method for computing material, surface position and surface parameters in a single pass.
*
* If material and surface position are required this is the best way to obtain that information.
*
* When using the coefficient cache be sure to have it properly set up. (MyPlanetShapeProvider.PrepareCache())
*/
public void ComputeCombinedMaterialAndSurface(Vector3 position, bool useCache, out MySurfaceParams props)
{
if (Closed)
{
Debug.Fail("Storage closed!");
props = new MySurfaceParams();
return;
}
byte occl = 0;
MyPlanetMaterialProvider.MaterialSampleParams pars;
position -= Shape.Center();
float distance = position.Length();
pars.Gravity = position / distance;
// Latitude
props.Latitude = pars.Gravity.Y;
Vector2 lon = new Vector2(-pars.Gravity.X, -pars.Gravity.Z);
lon.Normalize();
props.Longitude = lon.Y;
if (-pars.Gravity.X > 0)
{
props.Longitude = 2 - props.Longitude;
}
// Height and slope
int face;
Vector2 pos;
MyCubemapHelpers.CalculateSampleTexcoord(ref position, out face, out pos);
float value;
if(!useCache)
value = Shape.GetValueForPositionCacheless(face, ref pos, out props.Normal);
else
value = Shape.GetValueForPositionWithCache(face, ref pos, out props.Normal);
pars.SampledHeight = value;
pars.SurfaceDepth = 0;
pars.Texcoord = pos;
pars.LodSize = 1.0f;
pars.Latitude = props.Latitude;
pars.Longitude = props.Longitude;
pars.Face = face;
pars.Normal = props.Normal;
props.Position = pars.Gravity * (Radius + value) + Shape.Center();
props.Gravity = pars.Gravity = -pars.Gravity;
pars.DistanceToCenter = props.Position.Length();
var rule = Material.GetLayeredMaterialForPosition(ref pars, out props.Biome, ref occl);
if (rule.FirstOrDefault == null) props.Material = 0;
else props.Material = rule.FirstOrDefault.Index;
//props.Altitude = value;
props.Normal = pars.Normal;
props.HeightRatio = Shape.AltitudeToRatio(value);
}
