int GetTileZoomLevel()
{
// Get screen dimensions of central tile
int zoomLevel0 = 1;
int zoomLevel1 = TILE_MAX_ZOOM_LEVEL;
int zoomLevel = TILE_MIN_ZOOM_LEVEL;
Vector2 latLon = Conversion.GetLatLonFromSpherePoint(GetCurrentMapLocation());
int xTile, yTile;
currentTileSize = _tileSize > TILE_MIN_SIZE ? _tileSize : TILE_MIN_SIZE;
currentTileSize *= (3.0f - _tileResolutionFactor);
float dist = 0;
for (int i = 0; i < 5; i++)
{
zoomLevel = (zoomLevel0 + zoomLevel1) / 2;
Conversion.GetTileFromLatLon(zoomLevel, latLon.x, latLon.y, out xTile, out yTile);
Vector2 latLonTL = Conversion.GetLatLonFromTile(xTile, yTile, zoomLevel);
Vector2 latLonBR = Conversion.GetLatLonFromTile(xTile + 0.99f, yTile + 0.99f, zoomLevel);
Vector3 spherePointTL = Conversion.GetSpherePointFromLatLon(latLonTL);
Vector3 spherePointBR = Conversion.GetSpherePointFromLatLon(latLonBR);
Vector3 wposTL = currentCamera.WorldToScreenPoint(transform.TransformPoint(spherePointTL));
Vector3 wposBR = currentCamera.WorldToScreenPoint(transform.TransformPoint(spherePointBR));
dist = Mathf.Max(Mathf.Abs(wposBR.x - wposTL.x), Mathf.Abs(wposTL.y - wposBR.y));
if (dist > currentTileSize)
{
zoomLevel0 = zoomLevel;
}
else
{
zoomLevel1 = zoomLevel;
}
}
if (dist > currentTileSize)
{
zoomLevel++;
}
zoomLevel = Mathf.Clamp(zoomLevel, TILE_MIN_ZOOM_LEVEL, TILE_MAX_ZOOM_LEVEL);
return(zoomLevel);
}
void CreateTile(TileInfo ti)
{
Vector2 latLonTL = ti.latlons [0];
Vector2 latLonBR;
ZoomLevelInfo zi = zoomLevelsInfo [ti.zoomLevel];
int tileCode = GetTileHashCode(ti.x + 1, ti.y + 1, ti.zoomLevel);
TileInfo cachedTile;
if (cachedTiles.TryGetValue(tileCode, out cachedTile))
{
latLonBR = cachedTile.latlons [0];
}
else
{
latLonBR = Conversion.GetLatLonFromTile(ti.x + 1, ti.y + 1, ti.zoomLevel);
}
// Avoid seams on very close distance to surface
if (ti.zoomLevel >= 16)
{
float tao = 0.000002f * (ti.zoomLevel - 15);
latLonTL.x += tao;
latLonTL.y -= tao;
latLonBR.x -= tao;
latLonBR.y += tao;
}
// Create container
GameObject parentObj;
if (ti.parent == null)
{
parentObj = zi.tilesContainer;
if (parentObj == null)
{
parentObj = new GameObject("Tiles" + ti.zoomLevel);
parentObj.transform.SetParent(tilesRoot, false);
zi.tilesContainer = parentObj;
}
}
else
{
parentObj = ti.parent.gameObject;
}
// Prepare mesh vertices
Vector3[] tileCorners = new Vector3[4];
tileCorners [0] = Conversion.GetSpherePointFromLatLon(latLonTL);
tileCorners [1] = Conversion.GetSpherePointFromLatLon(new Vector2(latLonTL.x, latLonBR.y));
tileCorners [2] = Conversion.GetSpherePointFromLatLon(latLonBR);
tileCorners [3] = Conversion.GetSpherePointFromLatLon(new Vector2(latLonBR.x, latLonTL.y));
// Setup tile materials
TileInfo parent = ti.parent != null ? ti.parent : ti;
if (parent.normalMat == null)
{
parent.normalMat = Instantiate(tileMatRef);
parent.normalMat.hideFlags = HideFlags.DontSave;
}
if (parent.transMat == null)
{
parent.transMat = Instantiate(tileMatTransRef);
parent.transMat.hideFlags = HideFlags.DontSave;
}
Material tileMat = ti.zoomLevel < TILE_MIN_ZOOM_LEVEL ? parent.normalMat : parent.transMat;
// UVs wrt Earth texture
Vector2 tl = new Vector2((latLonTL.y + 180) / 360f, (latLonTL.x + 90) / 180f);
Vector2 br = new Vector2((latLonBR.y + 180) / 360f, (latLonBR.x + 90) / 180f);
if (tl.x > 0.5f && br.x < 0.5f)
{
br.x = 1f;
}
ti.worldTextureCoords = new Vector4(tl.x, br.y, br.x, tl.y);
ti.ClearPlaceholderImage();
if (ti.zoomLevel < TILE_MIN_ZOOM_LEVEL)
{
ti.loadStatus = TILE_LOAD_STATUS.Loaded;
}
ti.texture = currentEarthTexture;
ti.renderer = CreateObject(parentObj.transform, "Tile", tileCorners, tileIndices, tileUV, tileMat, ti.subquadIndex);
ti.gameObject = ti.renderer.gameObject;
ti.renderer.enabled = false;
ti.created = true;
#if DEBUG_TILES
ti.gameObject.AddComponent <TileInfoEx> ();
#endif
}
void CheckTiles(TileInfo parent, int currentZoomLevel, int xTile, int yTile, int zoomLevel, int subquadIndex)
{
// Is this tile visible?
TileInfo ti;
int tileCode = GetTileHashCode(xTile, yTile, zoomLevel);
if (!cachedTiles.TryGetValue(tileCode, out ti))
{
ti = new TileInfo(xTile, yTile, zoomLevel, subquadIndex, currentEarthTexture);
ti.parent = parent;
if (parent != null)
{
if (parent.children == null)
{
parent.children = new List <TileInfo> ();
}
parent.children.Add(ti);
}
for (int k = 0; k < 4; k++)
{
Vector2 latlon = Conversion.GetLatLonFromTile(xTile + offsets [k].x, yTile + offsets [k].y, zoomLevel);
ti.latlons [k] = latlon;
Vector3 spherePos = Conversion.GetSpherePointFromLatLon(latlon);
ti.spherePos [k] = spherePos;
}
cachedTiles [tileCode] = ti;
}
// Check if any tile corner is visible
// Phase I
#if DEBUG_TILES
if (ti.gameObject != null && ti.gameObject.GetComponent <TileInfoEx> ().debug)
{
Debug.Log("this");
}
#endif
bool cornersOccluded = true;
Vector3 minWorldPos = Misc.Vector3Max;
Vector3 maxWorldPos = Misc.Vector3Min;
Vector3 tmp = Misc.Vector3zero;
for (int c = 0; c < 4; c++)
{
Vector3 wpos = transform.TransformPoint(ti.spherePos [c]);
ti.cornerWorldPos [c] = wpos;
if (wpos.x < minWorldPos.x)
{
minWorldPos.x = wpos.x;
}
if (wpos.y < minWorldPos.y)
{
minWorldPos.y = wpos.y;
}
if (wpos.z < minWorldPos.z)
{
minWorldPos.z = wpos.z;
}
if (wpos.x > maxWorldPos.x)
{
maxWorldPos.x = wpos.x;
}
if (wpos.y > maxWorldPos.y)
{
maxWorldPos.y = wpos.y;
}
if (wpos.z > maxWorldPos.z)
{
maxWorldPos.z = wpos.z;
}
if (cornersOccluded)
{
float radiusSqr = (wpos.x - globePos.x) * (wpos.x - globePos.x) + (wpos.y - globePos.y) * (wpos.y - globePos.y) + (wpos.z - globePos.z) * (wpos.z - globePos.z); // Vector3.SqrMagnitude (wpos - globePos);
// Vector3 camDir = (currentCameraPosition - wpos).normalized;
FastVector.NormalizedDirection(ref wpos, ref currentCameraPosition, ref tmp);
// Vector3 st = wpos + ndir * (0.01f * transform.localScale.x);
Vector3 st = wpos;
FastVector.Add(ref st, ref tmp, localScaleFactor);
float mag = (st.x - globePos.x) * (st.x - globePos.x) + (st.y - globePos.y) * (st.y - globePos.y) + (st.z - globePos.z) * (st.z - globePos.z);
if (mag > radiusSqr)
{
cornersOccluded = false;
}
}
}
// Bounds bounds = new Bounds ((minWorldPos + maxWorldPos) * 0.5f, maxWorldPos - minWorldPos);
FastVector.Average(ref minWorldPos, ref maxWorldPos, ref tmp);
Bounds bounds = new Bounds(tmp, maxWorldPos - minWorldPos);
Vector3 tileMidPoint = bounds.center;
// Check center of quad
if (cornersOccluded)
{
float radiusSqr = (tileMidPoint.x - globePos.x) * (tileMidPoint.x - globePos.x) + (tileMidPoint.y - globePos.y) * (tileMidPoint.y - globePos.y) + (tileMidPoint.z - globePos.z) * (tileMidPoint.z - globePos.z); // Vector3.SqrMagnitude (tileMidPoint - globePos);
// Vector3 camDir = (currentCameraPosition - tileMidPoint).normalized;
FastVector.NormalizedDirection(ref tileMidPoint, ref currentCameraPosition, ref tmp);
// Vector3 st = tileMidPoint + tmp * (0.01f * transform.localScale.x);
Vector3 st = tileMidPoint;
FastVector.Add(ref st, ref tmp, localScaleFactor);
float mag = (st.x - globePos.x) * (st.x - globePos.x) + (st.y - globePos.y) * (st.y - globePos.y) + (st.z - globePos.z) * (st.z - globePos.z);
if (mag > radiusSqr)
{
cornersOccluded = false;
}
}
#if DEBUG_TILES
if (root == null)
{
root = new GameObject();
root.transform.SetParent(transform);
root.transform.localPosition = Vector3.zero;
root.transform.localRotation = Misc.QuaternionZero; //Quaternion.Euler (0, 0, 0);
}
#endif
bool insideViewport = false;
float minX = currentCamera.pixelWidth * 2f, minY = currentCamera.pixelHeight * 2f;
float maxX = -minX, maxY = -minY;
if (!cornersOccluded)
{
// Phase II
for (int c = 0; c < 4; c++)
{
Vector3 scrPos = currentCamera.WorldToScreenPoint(ti.cornerWorldPos [c]);
insideViewport = insideViewport || (scrPos.z > 0 && scrPos.x >= 0 && scrPos.x < currentCamera.pixelWidth && scrPos.y >= 0 && scrPos.y < currentCamera.pixelHeight);
if (scrPos.x < minX)
{
minX = scrPos.x;
}
if (scrPos.x > maxX)
{
maxX = scrPos.x;
}
if (scrPos.y < minY)
{
minY = scrPos.y;
}
if (scrPos.y > maxY)
{
maxY = scrPos.y;
}
}
if (!insideViewport)
{
insideViewport = GeometryUtility.TestPlanesAABB(cameraPlanes, bounds);
}
}
ti.insideViewport = insideViewport;
ti.visible = false;
if (insideViewport)
{
if (!ti.created)
{
CreateTile(ti);
}
if (!ti.gameObject.activeSelf)
{
ti.gameObject.SetActive(true);
}
// Manage hierarchy of tiles
bool tileIsBig = false;
FastVector.NormalizedDirection(ref globePos, ref tileMidPoint, ref tmp);
// float dd = Vector3.Dot (currentCameraForward, (tileMidPoint - globePos).normalized);
float dd = Vector3.Dot(currentCameraForward, tmp);
if (dd > -0.8f || currentZoomLevel > 9) // prevents big seams on initial zooms
{
float aparentSize = Mathf.Max(maxX - minX, maxY - minY);
tileIsBig = aparentSize > currentTileSize;
}
else
{
tileIsBig = ti.zoomLevel < currentZoomLevel;
}
#if DEBUG_TILES
if (ti.gameObject != null)
{
ti.gameObject.GetComponent <TileInfoEx> ().bigTile = tileIsBig;
ti.gameObject.GetComponent <TileInfoEx> ().zoomLevel = ti.zoomLevel;
}
#endif
if ((tileIsBig || zoomLevel < TILE_MIN_ZOOM_LEVEL) && zoomLevel < _tileMaxZoomLevel)
{
// Load nested tiles
CheckTiles(ti, currentZoomLevel, xTile * 2, yTile * 2, zoomLevel + 1, 0);
CheckTiles(ti, currentZoomLevel, xTile * 2 + 1, yTile * 2, zoomLevel + 1, 1);
CheckTiles(ti, currentZoomLevel, xTile * 2, yTile * 2 + 1, zoomLevel + 1, 2);
CheckTiles(ti, currentZoomLevel, xTile * 2 + 1, yTile * 2 + 1, zoomLevel + 1, 3);
ti.renderer.enabled = false;
}
else
{
ti.visible = true;
// Show tile renderer
if (!ti.renderer.enabled)
{
ti.renderer.enabled = true;
}
// If parent tile is loaded then use that as placeholder texture
if (ti.zoomLevel > TILE_MIN_ZOOM_LEVEL && ti.parent.loadStatus == TILE_LOAD_STATUS.Loaded && !ti.placeholderImageSet)
{
ti.placeholderImageSet = true;
ti.parentTextureCoords = placeHolderUV [ti.subquadIndex];
ti.SetPlaceholderImage(ti.parent.texture);
}
if (ti.loadStatus == TILE_LOAD_STATUS.Loaded)
{
if (!ti.hasAnimated)
{
ti.hasAnimated = true;
ti.Animate(1f, AnimationEnded);
}
}
else if (ti.loadStatus == TILE_LOAD_STATUS.Inactive)
{
ti.distToCamera = FastVector.SqrDistance(ref ti.cornerWorldPos [0], ref currentCameraPosition) * ti.zoomLevel;
ti.loadStatus = TILE_LOAD_STATUS.InQueue;
ti.queueTime = Time.time;
loadQueue.Add(ti);
}
if (ti.children != null)
{
for (int k = 0; k < 4; k++)
{
TileInfo tiChild = ti.children [k];
HideTile(tiChild);
}
}
}
}
else
{
HideTile(ti);
}
}