protected static boolean isTileVisible(
DrawContext dc, Tile tile, double minDistanceSquared, double maxDistanceSquared) {
if (!tile.getSector().intersects(dc.getVisibleSector())) return false;
View view = dc.getView();
Position eyePos = view.getEyePosition();
if (eyePos == null) return false;
Angle lat =
clampAngle(
eyePos.getLatitude(),
tile.getSector().getMinLatitude(),
tile.getSector().getMaxLatitude());
Angle lon =
clampAngle(
eyePos.getLongitude(),
tile.getSector().getMinLongitude(),
tile.getSector().getMaxLongitude());
Vec4 p = dc.getGlobe().computePointFromPosition(lat, lon, 0d);
double distSquared = dc.getView().getEyePoint().distanceToSquared3(p);
//noinspection RedundantIfStatement
if (minDistanceSquared > distSquared || maxDistanceSquared < distSquared) return false;
return true;
}
private boolean needToSplit(DrawContext dc, Sector sector) {
Vec4[] corners = sector.computeCornerPoints(dc.getGlobe(), dc.getVerticalExaggeration());
Vec4 centerPoint = sector.computeCenterPoint(dc.getGlobe(), dc.getVerticalExaggeration());
View view = dc.getView();
double d1 = view.getEyePoint().distanceTo3(corners[0]);
double d2 = view.getEyePoint().distanceTo3(corners[1]);
double d3 = view.getEyePoint().distanceTo3(corners[2]);
double d4 = view.getEyePoint().distanceTo3(corners[3]);
double d5 = view.getEyePoint().distanceTo3(centerPoint);
double minDistance = d1;
if (d2 < minDistance) minDistance = d2;
if (d3 < minDistance) minDistance = d3;
if (d4 < minDistance) minDistance = d4;
if (d5 < minDistance) minDistance = d5;
double cellSize =
(Math.PI * sector.getDeltaLatRadians() * dc.getGlobe().getRadius()) / 20; // TODO
return !(Math.log10(cellSize) <= (Math.log10(minDistance) - this.splitScale));
}
protected boolean isNavSectorVisible(
DrawContext dc, double minDistanceSquared, double maxDistanceSquared) {
if (!navSector.intersects(dc.getVisibleSector())) return false;
View view = dc.getView();
Position eyePos = view.getEyePosition();
if (eyePos == null) return false;
// check for eyePos over globe
if (Double.isNaN(eyePos.getLatitude().getDegrees())
|| Double.isNaN(eyePos.getLongitude().getDegrees())) return false;
Angle lat =
clampAngle(eyePos.getLatitude(), navSector.getMinLatitude(), navSector.getMaxLatitude());
Angle lon =
clampAngle(
eyePos.getLongitude(), navSector.getMinLongitude(), navSector.getMaxLongitude());
Vec4 p = dc.getGlobe().computePointFromPosition(lat, lon, 0d);
double distSquared = dc.getView().getEyePoint().distanceToSquared3(p);
//noinspection RedundantIfStatement
if (minDistanceSquared > distSquared || maxDistanceSquared < distSquared) return false;
return true;
}