private void UpdatePosition(Vector2 screenPosition)
{
var ray = context.World.GetRayForLocalBounds(screenPosition);
var scene = context.Scene;
var intersectionInfo = scene.GetBVHData().GetClosestIntersection(ray);
var oldPosition = getPosition();
var newPosition = oldPosition;
var world = Object3DControlContext.World;
var rayNormal = (oldPosition - world.EyePosition).GetNormal();
if (intersectionInfo == null)
{
if (HitPlane == null)
{
HitPlane = new PlaneShape(new Plane(rayNormal, oldPosition), null);
}
intersectionInfo = HitPlane.GetClosestIntersection(ray);
if (intersectionInfo != null)
{
newPosition = intersectionInfo.HitPosition;
}
}
else
{
HitPlane = new PlaneShape(new Plane(rayNormal, oldPosition), null);
foreach (var object3D in scene.Children)
{
if (object3D.GetBVHData().Contains(intersectionInfo.HitPosition))
{
newPosition = intersectionInfo.HitPosition;
break;
}
}
}
if (newPosition != oldPosition)
{
setPosition(newPosition);
context.GuiSurface.Invalidate();
}
}
