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BasicDragger terrain regression fix #20

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BasicDragger terrain regression fix #20

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31 changes: 25 additions & 6 deletions src/gov/nasa/worldwind/util/BasicDragger.java
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Original file line number Diff line number Diff line change
Expand Up @@ -100,7 +100,11 @@ else if (dragObject instanceof Movable)
if (refPos == null)
return;

Vec4 refPoint = globe.computePointFromPosition(refPos);
Vec4 refPoint = null;
if (this.isUseTerrain() && refPos.getElevation() < globe.getMaxElevation())
refPoint = wwd.getSceneController().getTerrain().getSurfacePoint(refPos);
if (refPoint == null)
refPoint = globe.computePointFromPosition(refPos);

if (!this.isDragging()) // Dragging started
{
Expand All @@ -122,10 +126,25 @@ else if (dragObject instanceof Movable)
double y = event.getMouseEvent().getComponent().getSize().height - this.dragRefObjectPoint.y + dy - 1;
Line ray = view.computeRayFromScreenPoint(x, y);
Position pickPos = null;
// Use intersection with sphere at reference altitude.
Intersection inters[] = globe.intersect(ray, this.dragRefAltitude);
if (inters != null)
pickPos = globe.computePositionFromPoint(inters[0].getIntersectionPoint());
if (this.isUseTerrain() && view.getEyePosition().getElevation() < globe.getMaxElevation() * 10)
{
// Use ray casting below some altitude
// Try ray intersection with current terrain geometry
Intersection[] intersections = wwd.getSceneController().getTerrain().intersect(ray);
if (intersections != null && intersections.length > 0)
pickPos = globe.computePositionFromPoint(intersections[0].getIntersectionPoint());
else
// Fallback on raycasting using elevation data
pickPos = RayCastingSupport.intersectRayWithTerrain(globe, ray.getOrigin(), ray.getDirection(),
200, 20);
}
if (pickPos == null)
{
// Use intersection with sphere at reference altitude.
Intersection inters[] = globe.intersect(ray, this.dragRefAltitude);
if (inters != null)
pickPos = globe.computePositionFromPoint(inters[0].getIntersectionPoint());
}

if (pickPos != null)
{
Expand All @@ -141,4 +160,4 @@ else if (dragObject instanceof Movable)
event.consume();
}
}
}
}