/// <summary>
/// Inverse (Go from lat/lon to specified projection)
/// </summary>
/// <param name="uv"></param>
/// <returns></returns>
public UV Inverse(UV uv)
{
return pj_inv(uv, projPJ);
}
static extern UV pj_inv(UV uv, IntPtr projPJ);
/// <summary>
/// Forward (Go from specified projection to lat/lon)
/// </summary>
/// <param name="uv"></param>
/// <returns></returns>
public UV Forward(UV uv)
{
return pj_fwd(uv, projPJ);
}
static extern UV pj_fwd(UV uv, IntPtr projPJ);
/// <summary>
/// This can be used by mesh calculation to calculate projected meshes for tiles
/// </summary>
internal virtual void GetProjectionCorners(IGeoSpatialDownloadTile tile, out UV ul, out UV ur, out UV ll, out UV lr)
{
// For normal quad tiles this is equal to the geographic coordinates
ul = new UV(tile.West, tile.North);
ur = new UV(tile.East, tile.North);
ll = new UV(tile.West, tile.South);
lr = new UV(tile.East, tile.South);
}
/// <summary>
/// Update layer (called from worker thread)
/// </summary>
public override void Update(DrawArgs drawArgs)
{
try
{
if (this.isOn == false)
{
return;
}
//NOTE for some reason Initialize is not getting called from the Plugin Menu Load/Unload
//it does get called when the plugin loads from Startup
//not sure what is going on, so i'll just call it manually
if (this.isInitialized == false)
{
this.Initialize(drawArgs);
return;
}
//get lat, lon
double lat = drawArgs.WorldCamera.Latitude.Degrees;
double lon = drawArgs.WorldCamera.Longitude.Degrees;
double tilt = drawArgs.WorldCamera.Tilt.Degrees;
//could go off distance, but this changes when view angle changes
//Angle fov = drawArgs.WorldCamera.Fov; //stays at 45 degress
//Angle viewRange = drawArgs.WorldCamera.ViewRange; //off of distance, same as TVR but changes when view angle changes
Angle tvr = drawArgs.WorldCamera.TrueViewRange; //off of altitude
//smallest altitude = 100m
//tvr = .00179663198575926
//start altitude = 12756273m
//tvr = 180
//WW _levelZeroTileSizeDegrees
//180 90 45 22.5 11.25 5.625 2.8125 1.40625 .703125 .3515625 .17578125 .087890625 0.0439453125 0.02197265625 0.010986328125 0.0054931640625
int zoomLevel = GetZoomLevelByTrueViewRange(tvr.Degrees);
//VE tiles
double metersY;
double yMeters;
int yMetersPerPixel;
int row;
double metersX = earthRadius * DegToRad(lon); //0
double xMeters = earthHalfCirc + metersX; //20037508.342789244
int xMetersPerPixel = (int)Math.Round(xMeters / MetersPerPixel(zoomLevel));
int col = xMetersPerPixel / pixelsPerTile;
//reproject - overrides row above
//this correctly keeps me on the current tile that is being viewed
UV uvCurrent = new UV(DegToRad(lon), DegToRad(lat));
uvCurrent = proj.Forward(uvCurrent);
metersY = uvCurrent.V;
yMeters = earthHalfCirc - metersY;
yMetersPerPixel = (int)Math.Round(yMeters / MetersPerPixel(zoomLevel));
row = yMetersPerPixel / pixelsPerTile;
//update mesh if VertEx changes
if (prevVe != World.Settings.VerticalExaggeration)
{
lock (veTiles.SyncRoot)
{
VeTile veTile;
for (int i = 0; i < veTiles.Count; i++)
{
veTile = (VeTile)veTiles[i];
if (veTile.VertEx != World.Settings.VerticalExaggeration)
{
veTile.CreateMesh(this.Opacity, World.Settings.VerticalExaggeration);
}
}
}
}
prevVe = World.Settings.VerticalExaggeration;
//if within previous bounds and same zoom level, then exit
if (row == prevRow && col == prevCol && zoomLevel == prevLvl && tilt == preTilt)
{
return;
}
//System.Diagnostics.Debug.WriteLine("CHANGE");
lock (veTiles.SyncRoot)
{
VeTile veTile;
for (int i = 0; i < veTiles.Count; i++)
{
veTile = (VeTile)veTiles[i];
veTile.IsNeeded = false;
}
}
//metadata
ArrayList alMetadata = null;
//add current tiles first
AddVeTile(drawArgs, row, col, zoomLevel, alMetadata);
//then add other tiles outwards in surrounding circles
AddNeighborTiles(drawArgs, row, col, zoomLevel, null, 1);
AddNeighborTiles(drawArgs, row, col, zoomLevel, null, 2);
AddNeighborTiles(drawArgs, row, col, zoomLevel, null, 3);
// Extend tile grid if camera tilt above some values
if (tilt > 45) AddNeighborTiles(drawArgs, row, col, zoomLevel, null, 4);
if (tilt > 60) AddNeighborTiles(drawArgs, row, col, zoomLevel, null, 5);
lock (veTiles.SyncRoot)
{
VeTile veTile;
for (int i = 0; i < veTiles.Count; i++)
{
veTile = (VeTile)veTiles[i];
if (veTile.IsNeeded == false && veTile.DownloadInProgress == false)
{
veTile.Dispose();
veTiles.RemoveAt(i);
i--;
}
}
}
prevRow = row;
prevCol = col;
prevLvl = zoomLevel;
preTilt = tilt;
}
catch (Exception ex)
{
Utility.Log.Write(ex);
}
}
//NOTE this is a mix from Mashi's Reproject and WW for terrain
internal void CreateMesh(byte opacity, float verticalExaggeration)
{
this.vertEx = verticalExaggeration;
meshPointCount = 32; //64; //96 // How many vertices for each direction in mesh (total: n^2)
//vertices = new CustomVertex.PositionColoredTextured[meshPointCount * meshPointCount];
// Build mesh with one extra row and col around the terrain for normal computation and struts
vertices = new CustomVertex.PositionNormalTextured[(meshPointCount + 2) * (meshPointCount + 2)];
int upperBound = meshPointCount - 1;
float scaleFactor = (float)1 / upperBound;
//using(Projection proj = new Projection(m_projectionParameters))
//{
double uStep = (UR.U - UL.U) / upperBound;
double vStep = (UL.V - LL.V) / upperBound;
UV curUnprojected = new UV(UL.U - uStep, UL.V + vStep);
// figure out latrange (for terrain detail)
UV geoUL = _proj.Inverse(m_ul);
UV geoLR = _proj.Inverse(m_lr);
double latRange = (geoUL.U - geoLR.U) * 180 / Math.PI;
North = geoUL.V * 180 / Math.PI;
South = geoLR.V * 180 / Math.PI;
West = geoUL.U * 180 / Math.PI;
East = geoLR.U * 180 / Math.PI;
float meshBaseRadius = (float)_layerRadius;
UV geo;
Point3d pos;
double height = 0;
for (int i = 0; i < meshPointCount + 2; i++)
{
for (int j = 0; j < meshPointCount + 2; j++)
{
geo = _proj.Inverse(curUnprojected);
// Radians -> Degrees
geo.U *= 180 / Math.PI;
geo.V *= 180 / Math.PI;
if (_terrainAccessor != null)
{
height = verticalExaggeration * _terrainAccessor.GetElevationAt(geo.V, geo.U, Math.Abs(upperBound / latRange));
}
pos = MathEngine.SphericalToCartesian(
geo.V,
geo.U,
_layerRadius + height);
int idx = i * (meshPointCount + 2) + j;
vertices[idx].X = (float)pos.X;
vertices[idx].Y = (float)pos.Y;
vertices[idx].Z = (float)pos.Z;
vertices[idx].Tu = (j - 1) * scaleFactor;
vertices[idx].Tv = (i - 1) * scaleFactor;
curUnprojected.U += uStep;
}
curUnprojected.U = UL.U - uStep;
curUnprojected.V -= vStep;
}
int slices = meshPointCount + 1;
indices = new short[2 * slices * slices * 3];
for (int i = 0; i < slices; i++)
{
for (int j = 0; j < slices; j++)
{
indices[(2 * 3 * i * slices) + 6 * j] = (short)(i * (meshPointCount + 2) + j);
indices[(2 * 3 * i * slices) + 6 * j + 1] = (short)((i + 1) * (meshPointCount + 2) + j);
indices[(2 * 3 * i * slices) + 6 * j + 2] = (short)(i * (meshPointCount + 2) + j + 1);
indices[(2 * 3 * i * slices) + 6 * j + 3] = (short)(i * (meshPointCount + 2) + j + 1);
indices[(2 * 3 * i * slices) + 6 * j + 4] = (short)((i + 1) * (meshPointCount + 2) + j);
indices[(2 * 3 * i * slices) + 6 * j + 5] = (short)((i + 1) * (meshPointCount + 2) + j + 1);
}
}
// Compute normals and fold struts
calculate_normals();
fold_struts(false, meshBaseRadius);
}
/// <summary>
/// Builds a mesh using a projection (with terrain if requested)
/// </summary>
protected virtual void CreateProjectedMesh(Projection proj, bool bTerrain)
{
int baseIndex;
UV geo;
double sinLat, cosLat, sinLon, cosLon, height, latRange = North - South;
double layerRadius = (double)quadTileSet.LayerRadius;
double scaleFactor = 1.0 / (double)vertexCount;
int thisVertexCount = vertexCount / 2 + (vertexCount % 2);
int thisVertexCountPlus1 = thisVertexCount + 1;
const double Degrees2Radians = Math.PI / 180.0;
int totalVertexCount = thisVertexCountPlus1 * thisVertexCountPlus1;
northWestVertices = new CustomVertex.PositionNormalTextured[totalVertexCount];
southWestVertices = new CustomVertex.PositionNormalTextured[totalVertexCount];
northEastVertices = new CustomVertex.PositionNormalTextured[totalVertexCount];
southEastVertices = new CustomVertex.PositionNormalTextured[totalVertexCount];
double uStep = (UR.U - UL.U) * scaleFactor;
double vStep = (UL.V - LL.V) * scaleFactor;
// figure out latrange (for terrain detail)
if (bTerrain)
{
UV geoUL = proj.Inverse(UL);
UV geoLR = proj.Inverse(LR);
latRange = (geoUL.V - geoLR.V) * 180 / Math.PI;
}
baseIndex = 0;
UV curUnprojected = new UV(UL.U, UL.V);
for (int i = 0; i < thisVertexCountPlus1; i++)
{
for (int j = 0; j < thisVertexCountPlus1; j++)
{
geo = proj.Inverse(curUnprojected);
sinLat = Math.Sin(geo.V);
sinLon = Math.Sin(geo.U);
cosLat = Math.Cos(geo.V);
cosLon = Math.Cos(geo.U);
height = layerRadius;
if (bTerrain)
{
// Radians -> Degrees
geo.U /= Degrees2Radians;
geo.V /= Degrees2Radians;
height += verticalExaggeration * quadTileSet.World.TerrainAccessor.GetElevationAt(geo.V, geo.U, Math.Abs(vertexCount / latRange));
}
northWestVertices[baseIndex].X = (float)(height * cosLat * cosLon - localOrigin.X);
northWestVertices[baseIndex].Y = (float)(height * cosLat * sinLon - localOrigin.Y);
northWestVertices[baseIndex].Z = (float)(height * sinLat - localOrigin.Z);
northWestVertices[baseIndex].Tu = (float)(j * scaleFactor);
northWestVertices[baseIndex].Tv = (float)(i * scaleFactor);
northWestVertices[baseIndex].Normal =
new Vector3(northWestVertices[baseIndex].X + (float)localOrigin.X,
northWestVertices[baseIndex].Y + (float)localOrigin.Y,
northWestVertices[baseIndex].Z + (float)localOrigin.Z);
northWestVertices[baseIndex].Normal.Normalize();
baseIndex += 1;
curUnprojected.U += uStep;
}
curUnprojected.U = UL.U;
curUnprojected.V -= vStep;
}
baseIndex = 0;
curUnprojected = new UV(UL.U, UL.V - (UL.V - LL.V) / 2.0);
for (int i = 0; i < thisVertexCountPlus1; i++)
{
for (int j = 0; j < thisVertexCountPlus1; j++)
{
geo = proj.Inverse(curUnprojected);
sinLat = Math.Sin(geo.V);
sinLon = Math.Sin(geo.U);
cosLat = Math.Cos(geo.V);
cosLon = Math.Cos(geo.U);
height = layerRadius;
if (bTerrain)
{
// Radians -> Degrees
geo.U /= Degrees2Radians;
geo.V /= Degrees2Radians;
height += verticalExaggeration * quadTileSet.World.TerrainAccessor.GetElevationAt(geo.V, geo.U, Math.Abs(vertexCount / latRange));
}
southWestVertices[baseIndex].X = (float)(height * cosLat * cosLon - localOrigin.X);
southWestVertices[baseIndex].Y = (float)(height * cosLat * sinLon - localOrigin.Y);
southWestVertices[baseIndex].Z = (float)(height * sinLat - localOrigin.Z);
southWestVertices[baseIndex].Tu = (float)(j * scaleFactor);
southWestVertices[baseIndex].Tv = (float)((i + thisVertexCount) * scaleFactor);
southWestVertices[baseIndex].Normal =
new Vector3(southWestVertices[baseIndex].X + (float)localOrigin.X,
southWestVertices[baseIndex].Y + (float)localOrigin.Y,
southWestVertices[baseIndex].Z + (float)localOrigin.Z);
southWestVertices[baseIndex].Normal.Normalize();
baseIndex += 1;
curUnprojected.U += uStep;
}
curUnprojected.U = UL.U;
curUnprojected.V -= vStep;
}
baseIndex = 0;
curUnprojected = new UV(UL.U + (UR.U - UL.U) / 2.0, UL.V);
for (int i = 0; i < thisVertexCountPlus1; i++)
{
for (int j = 0; j < thisVertexCountPlus1; j++)
{
geo = proj.Inverse(curUnprojected);
sinLat = Math.Sin(geo.V);
sinLon = Math.Sin(geo.U);
cosLat = Math.Cos(geo.V);
cosLon = Math.Cos(geo.U);
height = layerRadius;
if (bTerrain)
{
// Radians -> Degrees
geo.U /= Degrees2Radians;
geo.V /= Degrees2Radians;
height += verticalExaggeration * quadTileSet.World.TerrainAccessor.GetElevationAt(geo.V, geo.U, Math.Abs(vertexCount / latRange));
}
northEastVertices[baseIndex].X = (float)(height * cosLat * cosLon - localOrigin.X);
northEastVertices[baseIndex].Y = (float)(height * cosLat * sinLon - localOrigin.Y);
northEastVertices[baseIndex].Z = (float)(height * sinLat - localOrigin.Z);
northEastVertices[baseIndex].Tu = (float)((j + thisVertexCount) * scaleFactor);
northEastVertices[baseIndex].Tv = (float)(i * scaleFactor);
northEastVertices[baseIndex].Normal =
new Vector3(northEastVertices[baseIndex].X + (float)localOrigin.X,
northEastVertices[baseIndex].Y + (float)localOrigin.Y,
northEastVertices[baseIndex].Z + (float)localOrigin.Z);
northEastVertices[baseIndex].Normal.Normalize();
baseIndex += 1;
curUnprojected.U += uStep;
}
curUnprojected.U = UL.U + (UR.U - UL.U) / 2.0;
curUnprojected.V -= vStep;
}
baseIndex = 0;
curUnprojected = new UV(UL.U + (UR.U - UL.U) / 2.0, UL.V - (UL.V - LL.V) / 2.0);
for (int i = 0; i < thisVertexCountPlus1; i++)
{
for (int j = 0; j < thisVertexCountPlus1; j++)
{
geo = proj.Inverse(curUnprojected);
sinLat = Math.Sin(geo.V);
sinLon = Math.Sin(geo.U);
cosLat = Math.Cos(geo.V);
cosLon = Math.Cos(geo.U);
height = layerRadius;
if (bTerrain)
{
// Radians -> Degrees
geo.U /= Degrees2Radians;
geo.V /= Degrees2Radians;
height += verticalExaggeration * quadTileSet.World.TerrainAccessor.GetElevationAt(geo.V, geo.U, Math.Abs(vertexCount / latRange));
}
southEastVertices[baseIndex].X = (float)(height * cosLat * cosLon - localOrigin.X);
southEastVertices[baseIndex].Y = (float)(height * cosLat * sinLon - localOrigin.Y);
southEastVertices[baseIndex].Z = (float)(height * sinLat - localOrigin.Z);
southEastVertices[baseIndex].Tu = (float)((j + thisVertexCount) * scaleFactor);
southEastVertices[baseIndex].Tv = (float)((i + thisVertexCount) * scaleFactor);
southEastVertices[baseIndex].Normal =
new Vector3(southEastVertices[baseIndex].X + (float)localOrigin.X,
southEastVertices[baseIndex].Y + (float)localOrigin.Y,
southEastVertices[baseIndex].Z + (float)localOrigin.Z);
southEastVertices[baseIndex].Normal.Normalize();
baseIndex += 1;
curUnprojected.U += uStep;
}
curUnprojected.U = UL.U + (UR.U - UL.U) / 2.0;
curUnprojected.V -= vStep;
}
vertexIndexes = new short[2 * thisVertexCount * thisVertexCount * 3];
for (int i = 0; i < thisVertexCount; i++)
{
baseIndex = (2 * 3 * i * thisVertexCount);
for (int j = 0; j < thisVertexCount; j++)
{
vertexIndexes[baseIndex] = (short)(i * thisVertexCountPlus1 + j);
vertexIndexes[baseIndex + 1] = (short)((i + 1) * thisVertexCountPlus1 + j);
vertexIndexes[baseIndex + 2] = (short)(i * thisVertexCountPlus1 + j + 1);
vertexIndexes[baseIndex + 3] = (short)(i * thisVertexCountPlus1 + j + 1);
vertexIndexes[baseIndex + 4] = (short)((i + 1) * thisVertexCountPlus1 + j);
vertexIndexes[baseIndex + 5] = (short)((i + 1) * thisVertexCountPlus1 + j + 1);
baseIndex += 6;
}
}
// JBTODO: Should we normalize here for elevated mesh?
}