internal FormatYielder Spawn(UnparsableAst child, ChildLocation childLocation = ChildLocation.Unknown)
{
if (childLocation == ChildLocation.Unknown)
{
return(new FormatYielder(this)
{
topAncestorCacheForLeft = UnparsableAst.NonCalculated
});
}
else
{
bool isLeftMostChild =
childLocation == ChildLocation.Only
||
direction == Unparser.Direction.LeftToRight && childLocation == ChildLocation.First
||
direction == Unparser.Direction.RightToLeft && childLocation == ChildLocation.Last;
return(new FormatYielder(this)
{
topAncestorCacheForLeft = isLeftMostChild
? this.topAncestorCacheForLeft
: (child ?? UnparsableAst.NonCalculated)
});
}
}
/// <summary>
/// Create child tile terrain mesh
/// Build the mesh with one extra vertice all around for proper normals calculations later on.
/// Use the struts vertices to that effect. Struts are properly folded after normals calculations.
/// </summary>
protected void CreateElevatedMesh(ChildLocation corner, CustomVertex.PositionNormalTextured[] vertices,
double meshBaseRadius, float[,] heightData)
{
// Figure out child lat/lon boundaries (radians)
double north = MathEngine.DegreesToRadians(North);
double west = MathEngine.DegreesToRadians(West);
// Texture coordinate offsets
float TuOffset = 0;
float TvOffset = 0;
switch (corner)
{
case ChildLocation.NorthWest:
// defaults are all good
break;
case ChildLocation.NorthEast:
west = MathEngine.DegreesToRadians(0.5 * (West + East));
TuOffset = 0.5f;
break;
case ChildLocation.SouthWest:
north = MathEngine.DegreesToRadians(0.5 * (North + South));
TvOffset = 0.5f;
break;
case ChildLocation.SouthEast:
north = MathEngine.DegreesToRadians(0.5 * (North + South));
west = MathEngine.DegreesToRadians(0.5 * (West + East));
TuOffset = 0.5f;
TvOffset = 0.5f;
break;
}
double latitudeRadianSpan = MathEngine.DegreesToRadians(LatitudeSpan);
double longitudeRadianSpan = MathEngine.DegreesToRadians(LongitudeSpan);
double layerRadius = (double)QuadTileSet.LayerRadius;
double scaleFactor = 1.0 / vertexCountElevated;
int terrainLongitudeIndex = (int)(TuOffset * vertexCountElevated) + 1;
int terrainLatitudeIndex = (int)(TvOffset * vertexCountElevated) + 1;
int vertexCountElevatedPlus1 = vertexCountElevated / 2 + 1;
double radius = 0;
int vertexIndex = 0;
for (int latitudeIndex = -1; latitudeIndex <= vertexCountElevatedPlus1; latitudeIndex++)
{
double latitudeFactor = latitudeIndex * scaleFactor;
double latitude = north - latitudeFactor * latitudeRadianSpan;
// Cache trigonometric values
double cosLat = Math.Cos(latitude);
double sinLat = Math.Sin(latitude);
for (int longitudeIndex = -1; longitudeIndex <= vertexCountElevatedPlus1; longitudeIndex++)
{
// Top of mesh for all (real terrain + struts)
radius = layerRadius +
heightData[terrainLatitudeIndex + latitudeIndex, terrainLongitudeIndex + longitudeIndex]
* verticalExaggeration;
double longitudeFactor = longitudeIndex * scaleFactor;
// Texture coordinates
vertices[vertexIndex].Tu = TuOffset + (float)longitudeFactor;
vertices[vertexIndex].Tv = TvOffset + (float)latitudeFactor;
// Convert from spherical (radians) to cartesian
double longitude = west + longitudeFactor * longitudeRadianSpan;
double radCosLat = radius * cosLat;
vertices[vertexIndex].X = (float)(radCosLat * Math.Cos(longitude) - localOrigin.X);
vertices[vertexIndex].Y = (float)(radCosLat * Math.Sin(longitude) - localOrigin.Y);
vertices[vertexIndex].Z = (float)(radius * sinLat - localOrigin.Z);
vertexIndex++;
}
}
}
/// <summary>
/// Create child tile terrain mesh
/// </summary>
protected void CreateElevatedMesh(ChildLocation corner, CustomVertex.PositionTextured[] vertices, double meshBaseRadius, float[,] heightData)
{
// Figure out child lat/lon boundaries (radians)
double north = MathEngine.DegreesToRadians(North);
double west = MathEngine.DegreesToRadians(West);
// Texture coordinate offsets
float TuOffset = 0;
float TvOffset = 0;
switch (corner)
{
case ChildLocation.NorthWest:
// defaults are all good
break;
case ChildLocation.NorthEast:
west = MathEngine.DegreesToRadians(0.5 * (West + East));
TuOffset = 0.5f;
break;
case ChildLocation.SouthWest:
north = MathEngine.DegreesToRadians(0.5 * (North + South));
TvOffset = 0.5f;
break;
case ChildLocation.SouthEast:
north = MathEngine.DegreesToRadians(0.5 * (North + South));
west = MathEngine.DegreesToRadians(0.5 * (West + East));
TuOffset = 0.5f;
TvOffset = 0.5f;
break;
}
double latitudeRadianSpan = MathEngine.DegreesToRadians(LatitudeSpan);
double longitudeRadianSpan = MathEngine.DegreesToRadians(LongitudeSpan);
double layerRadius = (double)QuadTileSet.LayerRadius;
double scaleFactor = 1.0 / vertexCountElevated;
int terrainLongitudeIndex = (int)(TuOffset * vertexCountElevated);
int terrainLatitudeIndex = (int)(TvOffset * vertexCountElevated);
int vertexCountElevatedPlus1 = vertexCountElevated / 2 + 1;
double radius = 0;
int vertexIndex = 0;
for (int latitudeIndex = -1; latitudeIndex <= vertexCountElevatedPlus1; latitudeIndex++)
{
int latitudePoint = latitudeIndex;
if (latitudePoint < 0)
{
latitudePoint = 0;
}
else if (latitudePoint >= vertexCountElevatedPlus1)
{
latitudePoint = vertexCountElevatedPlus1 - 1;
}
double latitudeFactor = latitudePoint * scaleFactor;
double latitude = north - latitudeFactor * latitudeRadianSpan;
// Cache trigonometric values
double cosLat = Math.Cos(latitude);
double sinLat = Math.Sin(latitude);
for (int longitudeIndex = -1; longitudeIndex <= vertexCountElevatedPlus1; longitudeIndex++)
{
int longitudePoint = longitudeIndex;
if (longitudePoint < 0)
{
longitudePoint = 0;
}
else if (longitudePoint >= vertexCountElevatedPlus1)
{
longitudePoint = vertexCountElevatedPlus1 - 1;
}
if (longitudeIndex != longitudePoint ||
latitudeIndex != latitudePoint)
{
if (heightData != null &&
(!renderStruts || m_CurrentOpacity < 255))
{
radius = layerRadius + heightData[terrainLatitudeIndex + latitudePoint, terrainLongitudeIndex + longitudePoint] * verticalExaggeration;
}
else
{
radius = meshBaseRadius;
}
// // Mesh base (flat)
// radius = meshBaseRadius;
}
else
{
// Top of mesh (real terrain)
radius = layerRadius + heightData[terrainLatitudeIndex + latitudeIndex, terrainLongitudeIndex + longitudeIndex] * verticalExaggeration;
}
double longitudeFactor = longitudePoint * scaleFactor;
// Texture coordinates
vertices[vertexIndex].Tu = TuOffset + (float)longitudeFactor;
vertices[vertexIndex].Tv = TvOffset + (float)latitudeFactor;
// Convert from spherical (radians) to cartesian
double longitude = west + longitudeFactor * longitudeRadianSpan;
double radCosLat = radius * cosLat;
vertices[vertexIndex].X = (float)(radCosLat * Math.Cos(longitude) - localOrigin.X);
vertices[vertexIndex].Y = (float)(radCosLat * Math.Sin(longitude) - localOrigin.Y);
vertices[vertexIndex].Z = (float)(radius * sinLat - localOrigin.Z);
vertexIndex++;
}
}
}
internal FormatYielder Spawn(ChildLocation childLocation = ChildLocation.Unknown)
{
return(Spawn(child: null, childLocation: childLocation));
}
internal FormatYielder Spawn(UnparsableAst child, ChildLocation childLocation = ChildLocation.Unknown)
{
if (childLocation == ChildLocation.Unknown)
{
return new FormatYielder(this)
{
topAncestorCacheForLeft = UnparsableAst.NonCalculated
};
}
else
{
bool isLeftMostChild =
childLocation == ChildLocation.Only
||
direction == Unparser.Direction.LeftToRight && childLocation == ChildLocation.First
||
direction == Unparser.Direction.RightToLeft && childLocation == ChildLocation.Last;
return new FormatYielder(this)
{
topAncestorCacheForLeft = isLeftMostChild
? this.topAncestorCacheForLeft
: (child ?? UnparsableAst.NonCalculated)
};
}
}
internal FormatYielder Spawn(ChildLocation childLocation = ChildLocation.Unknown)
{
return Spawn(child: null, childLocation: childLocation);
}
