// alternative way, 3.36 times slower
protected bool MyHitTest(Ray rayWS, ref List<HitTestResult> hits)
{
LineGeometry3D lineGeometry3D;
Viewport3DX viewport;
if (this.Visibility == Visibility.Collapsed ||
this.IsHitTestVisible == false ||
(viewport = FindVisualAncestor<Viewport3DX>(this.renderHost as DependencyObject)) == null ||
(lineGeometry3D = this.Geometry as LineGeometry3D) == null)
{
return false;
}
var result = new HitTestResult { IsValid = false, Distance = double.MaxValue };
var lastDist = double.MaxValue;
var index = 0;
foreach (var line in lineGeometry3D.Lines)
{
var t0 = Vector3.TransformCoordinate(line.P0, this.ModelMatrix);
var t1 = Vector3.TransformCoordinate(line.P1, this.ModelMatrix);
Vector3 sp, tp;
float sc, tc;
var distance = LineBuilder.GetRayToLineDistance(rayWS, t0, t1, out sp, out tp, out sc, out tc);
var svpm = viewport.GetScreenViewProjectionMatrix();
Vector4 sp4;
Vector4 tp4;
Vector3.Transform(ref sp, ref svpm, out sp4);
Vector3.Transform(ref tp, ref svpm, out tp4);
var sp3 = sp4.ToVector3();
var tp3 = tp4.ToVector3();
var tv2 = new Vector2(tp3.X - sp3.X, tp3.Y - sp3.Y);
var dist = tv2.Length();
if (dist < lastDist && dist <= this.HitTestThickness)
{
lastDist = dist;
result.PointHit = sp.ToPoint3D();
result.NormalAtHit = (sp - tp).ToVector3D(); // not normalized to get length
result.Distance = distance;
result.ModelHit = this;
result.IsValid = true;
result.Tag = index; // ToDo: LineHitTag with additional info
}
index++;
}
if (result.IsValid)
{
hits.Add(result);
}
return result.IsValid;
}
public override bool HitTest(Ray rayWS, ref List<HitTestResult> hits)
{
LineGeometry3D lineGeometry3D;
Viewport3DX viewport;
if (this.Visibility == Visibility.Collapsed ||
this.IsHitTestVisible == false ||
(viewport = FindVisualAncestor<Viewport3DX>(this.renderHost as DependencyObject)) == null ||
(lineGeometry3D = this.Geometry as LineGeometry3D) == null)
{
return false;
}
// revert unprojection; probably better: overloaded HitTest() for LineGeometryModel3D?
var svpm = viewport.GetScreenViewProjectionMatrix();
var smvpm = this.modelMatrix * svpm;
var clickPoint4 = new Vector4(rayWS.Position + rayWS.Direction, 1);
Vector4.Transform(ref clickPoint4, ref svpm, out clickPoint4);
var clickPoint = clickPoint4.ToVector3();
var result = new HitTestResult { IsValid = false, Distance = double.MaxValue };
var maxDist = this.HitTestThickness;
var lastDist = double.MaxValue;
var index = 0;
foreach (var line in lineGeometry3D.Lines)
{
var p0 = Vector3.TransformCoordinate(line.P0, smvpm);
var p1 = Vector3.TransformCoordinate(line.P1, smvpm);
Vector3 hitPoint;
float t;
var dist = LineBuilder.GetPointToLineDistance2D(ref clickPoint, ref p0, ref p1, out hitPoint, out t);
if (dist < lastDist && dist <= maxDist)
{
lastDist = dist;
Vector4 res;
var lp0 = line.P0;
Vector3.Transform(ref lp0, ref this.modelMatrix, out res);
lp0 = res.ToVector3();
var lp1 = line.P1;
Vector3.Transform(ref lp1, ref this.modelMatrix, out res);
lp1 = res.ToVector3();
var lv = lp1 - lp0;
var hitPointWS = lp0 + lv * t;
result.Distance = (rayWS.Position - hitPointWS).Length();
result.PointHit = hitPointWS.ToPoint3D();
result.ModelHit = this;
result.IsValid = true;
result.Tag = index; // ToDo: LineHitTag with additional info
}
index++;
}
if (result.IsValid)
{
hits.Add(result);
}
return result.IsValid;
}
