private void preloadTiles(MeshTile[] tiles) {
double minValue = Double.MAX_VALUE;
double minScale = 1d;
BufferWrapperRaster[] rasters = new BufferWrapperRaster[tiles.length];
for (int i = 0; i < tiles.length; i++) {
rasters[i] = this.readTileRaster(tiles[i]);
double[] minAndMax = ElevationMesh.getMinAndMaxValues(rasters[i]);
if (minAndMax[0] < minValue) minValue = minAndMax[0];
double scale =
ElevationMesh.suggestVerticalScale(tiles[i].getSector(), tiles[i].getMeshCoords());
if (scale < minScale) minScale = scale;
}
if (minValue == Double.MAX_VALUE) minValue = 0d;
this.verticalOffset = -minValue;
this.verticalScale = minScale;
for (int i = 0; i < tiles.length; i++) {
ElevationMesh mesh =
this.createMesh(tiles[i], rasters[i], this.verticalOffset, this.verticalScale);
this.cache.add(tiles[i].getTileKey(), mesh);
}
}
private void drawTile(GL gl, Camera camera, MeshTile tile) {
TileKey key = tile.getTileKey();
ElevationMesh mesh = (ElevationMesh) this.cache.getObject(key);
if (mesh == null && !this.cache.contains(key)) {
BufferWrapperRaster raster = this.readTileRaster(tile);
mesh = this.createMesh(tile, raster, this.verticalOffset, this.verticalScale);
long size = (mesh != null) ? mesh.getSizeInBytes() : 1L;
this.cache.add(key, mesh, size);
}
if (mesh != null) mesh.render(gl, camera);
}