// 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);
}
// 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);
}
public MouseMove3DEventArgs(object source, HitTestResult hitTestResult, Point position, Viewport3DX viewport = null)
: base(GeometryModel3D.MouseMove3DEvent, source, hitTestResult, position, viewport)
{
}
/// <summary>
/// Initial implementation of hittest for billboard. Needs further improvement.
/// </summary>
/// <param name="rayWS"></param>
/// <param name="hits"></param>
/// <returns></returns>
public override bool HitTest(Ray rayWS, ref List <HitTestResult> hits)
{
if (this.Visibility == Visibility.Collapsed || this.Visibility == Visibility.Hidden)
{
return(false);
}
if (this.IsHitTestVisible == false)
{
return(false);
}
var g = this.Geometry as IBillboardText;
var h = false;
var result = new HitTestResult();
result.Distance = double.MaxValue;
Viewport3DX viewport;
if ((viewport = FindVisualAncestor <Viewport3DX>(this.renderHost as DependencyObject)) == null || g.Width == 0 || g.Height == 0)
{
return(false);
}
if (g != null)
{
var visualToScreen = viewport.GetViewProjectionMatrix() * viewport.GetViewportMatrix();
float heightScale = 1;
var screenToVisual = visualToScreen.Inverted();
var center = new Vector4(g.Positions[0], 1);
var screenPoint = Vector4.Transform(center, visualToScreen);
var spw = screenPoint.W;
var spx = screenPoint.X;
var spy = screenPoint.Y;
var spz = screenPoint.Z;
var left = -g.Width / 2;
var right = g.Width / 2;
var top = -g.Height / 2 * heightScale;
var bottom = g.Height / 2 * heightScale;
Debug.WriteLine(spw);
Debug.WriteLine(string.Format("Z={0}; W={1}", spz, spw));
var bl = new Vector4(spx + left * spw, spy + bottom * spw, spz, spw);
bl = Vector4.Transform(bl, screenToVisual);
bl /= bl.W;
var br = new Vector4(spx + right * spw, spy + bottom * spw, spz, spw);
br = Vector4.Transform(br, screenToVisual);
br /= br.W;
var tr = new Vector4(spx + right * spw, spy + top * spw, spz, spw);
tr = Vector4.Transform(tr, screenToVisual);
tr /= tr.W;
var tl = new Vector4(spx + left * spw, spy + top * spw, spz, spw);
tl = Vector4.Transform(tl, screenToVisual);
tl /= tl.W;
var b = BoundingBox.FromPoints(new Vector3[] { tl.ToVector3(), tr.ToVector3(), bl.ToVector3(), br.ToVector3() });
// this all happens now in world space now:
Debug.WriteLine(string.Format("RayPosition:{0}; Direction:{1};", rayWS.Position, rayWS.Direction));
if (rayWS.Intersects(ref b))
{
float distance;
if (Collision.RayIntersectsBox(ref rayWS, ref b, out distance))
{
h = true;
result.ModelHit = this;
result.IsValid = true;
result.PointHit = (rayWS.Position + (rayWS.Direction * distance)).ToPoint3D();
result.Distance = distance;
Debug.WriteLine(string.Format("Hit; HitPoint:{0}; Bound={1}; Distance={2}", result.PointHit, b, distance));
}
}
}
if (h)
{
hits.Add(result);
}
return(h);
}
public MouseMove3DEventArgs(object source, HitTestResult hitTestResult, Point position, Viewport3DX viewport = null)
: base(GeometryModel3D.MouseMove3DEvent, source, hitTestResult, position, viewport)
{ }
public Mouse3DEventArgs(RoutedEvent routedEvent, object source, HitTestResult hitTestResult, Point position, Viewport3DX viewport = null)
: base(routedEvent, source)
{
this.HitTestResult = hitTestResult;
this.Position = position;
this.Viewport = viewport;
}
private void SetSelectedElement(Helix.HitTestResult hit)
{
var model = hit?.ModelHit as Helix.Element3D;
SetSelectedElement(model);
}
public MouseMove3DEventArgs(object source, HitTestResult hitTestResult, Point position, Viewport3DX viewport = null, InputEventArgs originalInputEventArgs = null)
: base(Element3D.MouseMove3DEvent, source, hitTestResult, position, viewport, originalInputEventArgs)
{
}
/// <summary>
/// Checks if the ray hits the geometry of the model.
/// If there a more than one hit, result returns the hit which is nearest to the ray origin.
/// </summary>
/// <param name="rayWS">Hitring ray from the camera.</param>
/// <param name="result">results of the hit.</param>
/// <returns>True if the ray hits one or more times.</returns>
public override bool HitTest(Ray rayWS, ref List<HitTestResult> hits)
{
PointGeometry3D pointGeometry3D;
Viewport3DX viewport;
if (this.Visibility == Visibility.Collapsed ||
this.IsHitTestVisible == false ||
(viewport = FindVisualAncestor<Viewport3DX>(this.renderHost as DependencyObject)) == null ||
(pointGeometry3D = this.Geometry as PointGeometry3D) == null)
{
return false;
}
var svpm = viewport.GetScreenViewProjectionMatrix();
var smvpm = this.modelMatrix * svpm;
var clickPoint4 = new Vector4(rayWS.Position + rayWS.Direction, 1);
var pos4 = new Vector4(rayWS.Position, 1);
var dir3 = new Vector3();
Vector4.Transform(ref clickPoint4, ref svpm, out clickPoint4);
Vector4.Transform(ref pos4, ref svpm, out pos4);
Vector3.TransformNormal(ref rayWS.Direction, ref svpm, out dir3);
dir3.Normalize();
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 point in pointGeometry3D.Points)
{
var p0 = Vector3.TransformCoordinate(point.P0, smvpm);
var pv = p0 - clickPoint;
var dist = pv.Length();
if (dist < lastDist && dist <= maxDist)
{
lastDist = dist;
Vector4 res;
var lp0 = point.P0;
Vector3.Transform(ref lp0, ref this.modelMatrix, out res);
var pvv = res.ToVector3();
var dst = DistanceRayToPoint(rayWS, pvv);
result.Distance = dst;
result.PointHit = pvv.ToPoint3D();
result.ModelHit = this;
result.IsValid = true;
result.Tag = index;
}
index++;
}
if (result.IsValid)
{
hits.Add(result);
}
return result.IsValid;
}
public MouseUp3DEventArgs(object source, HitTestResult hitTestResult, Point position, Viewport3DX viewport = null)
: base(Element3D.MouseUp3DEvent, source, hitTestResult, position, viewport)
{
}
/// <summary>
/// Checks if the ray hits the geometry of the model.
/// If there a more than one hit, result returns the hit which is nearest to the ray origin.
/// </summary>
/// <param name="rayWS">Hitring ray from the camera.</param>
/// <param name="result">results of the hit.</param>
/// <returns>True if the ray hits one or more times.</returns>
public override bool HitTest(Ray rayWS, ref List <HitTestResult> hits)
{
PointGeometry3D pointGeometry3D;
Viewport3DX viewport;
if (this.Visibility == Visibility.Collapsed ||
this.IsHitTestVisible == false ||
(viewport = FindVisualAncestor <Viewport3DX>(this.renderHost as DependencyObject)) == null ||
(pointGeometry3D = this.Geometry as PointGeometry3D) == null)
{
return(false);
}
var svpm = viewport.GetScreenViewProjectionMatrix();
var smvpm = this.modelMatrix * svpm;
var clickPoint4 = new Vector4(rayWS.Position + rayWS.Direction, 1);
var pos4 = new Vector4(rayWS.Position, 1);
var dir3 = new Vector3();
Vector4.Transform(ref clickPoint4, ref svpm, out clickPoint4);
Vector4.Transform(ref pos4, ref svpm, out pos4);
Vector3.TransformNormal(ref rayWS.Direction, ref svpm, out dir3);
dir3.Normalize();
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 point in pointGeometry3D.Points)
{
var p0 = Vector3.TransformCoordinate(point.P0, smvpm);
var pv = p0 - clickPoint;
var dist = pv.Length();
if (dist < lastDist && dist <= maxDist)
{
lastDist = dist;
Vector4 res;
var lp0 = point.P0;
Vector3.Transform(ref lp0, ref this.modelMatrix, out res);
var pvv = res.ToVector3();
var dst = DistanceRayToPoint(rayWS, pvv);
result.Distance = dst;
result.PointHit = pvv.ToPoint3D();
result.ModelHit = this;
result.IsValid = true;
result.Tag = index;
}
index++;
}
if (result.IsValid)
{
hits.Add(result);
}
return(result.IsValid);
}
protected override bool OnHitTest(IRenderMatrices context, Ray rayWS, ref List <HitTestResult> hits)
{
var g = this.geometryInternal as MeshGeometry3D;
bool isHit = false;
if (g.Octree != null)
{
isHit = g.Octree.HitTest(context, this, ModelMatrix, rayWS, ref hits);
}
else
{
var result = new HitTestResult();
result.Distance = double.MaxValue;
if (g != null)
{
var modelInvert = this.modelMatrix.Inverted();
//transform ray into model coordinates
var rayModel = new Ray(Vector3.TransformCoordinate(rayWS.Position, modelInvert), Vector3.TransformNormal(rayWS.Direction, modelInvert));
var b = Bounds;
//Do hit test in local space
if (rayModel.Intersects(ref b))
{
int index = 0;
foreach (var t in g.Triangles)
{
float d;
var v0 = t.P0;
var v1 = t.P1;
var v2 = t.P2;
if (Collision.RayIntersectsTriangle(ref rayModel, ref v0, ref v1, ref v2, out d))
{
if (d > 0 && d < result.Distance) // If d is NaN, the condition is false.
{
result.IsValid = true;
result.ModelHit = this;
// transform hit-info to world space now:
var pointWorld = Vector3.TransformCoordinate(rayModel.Position + (rayModel.Direction * d), modelMatrix);
result.PointHit = pointWorld.ToPoint3D();
result.Distance = (rayWS.Position - pointWorld).Length();
var p0 = Vector3.TransformCoordinate(v0, modelMatrix);
var p1 = Vector3.TransformCoordinate(v1, modelMatrix);
var p2 = Vector3.TransformCoordinate(v2, modelMatrix);
var n = Vector3.Cross(p1 - p0, p2 - p0);
n.Normalize();
// transform hit-info to world space now:
result.NormalAtHit = n.ToVector3D();// Vector3.TransformNormal(n, m).ToVector3D();
result.TriangleIndices = new System.Tuple <int, int, int>(g.Indices[index], g.Indices[index + 1], g.Indices[index + 2]);
result.Tag = index / 3;
isHit = true;
}
}
index += 3;
}
}
}
if (isHit)
{
hits.Add(result);
}
}
return(isHit);
}
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;
}
/// <summary>
/// Checks if the ray hits the geometry of the model.
/// If there a more than one hit, result returns the hit which is nearest to the ray origin.
/// </summary>
/// <param name="rayWS">Hitring ray from the camera.</param>
/// <param name="result">results of the hit.</param>
/// <returns>True if the ray hits one or more times.</returns>
public virtual bool HitTest(Ray rayWS, ref List<HitTestResult> hits)
{
if (this.Visibility == Visibility.Collapsed)
{
return false;
}
if (this.IsHitTestVisible == false)
{
return false;
}
var g = this.Geometry as MeshGeometry3D;
var isHit = false;
var result = new HitTestResult();
result.Distance = double.MaxValue;
if (g != null)
{
var m = this.modelMatrix;
// put bounds to world space
var b = BoundingBox.FromPoints(this.Bounds.GetCorners().Select(x => Vector3.TransformCoordinate(x, m)).ToArray());
//var b = this.Bounds;
// this all happens now in world space now:
if (rayWS.Intersects(ref b))
{
int index = 0;
foreach (var t in g.Triangles)
{
float d;
var p0 = Vector3.TransformCoordinate(t.P0, m);
var p1 = Vector3.TransformCoordinate(t.P1, m);
var p2 = Vector3.TransformCoordinate(t.P2, m);
if (Collision.RayIntersectsTriangle(ref rayWS, ref p0, ref p1, ref p2, out d))
{
if (d > 0 && d < result.Distance) // If d is NaN, the condition is false.
{
result.IsValid = true;
result.ModelHit = this;
// transform hit-info to world space now:
result.PointHit = (rayWS.Position + (rayWS.Direction * d)).ToPoint3D();
result.Distance = d;
var n = Vector3.Cross(p1 - p0, p2 - p0);
n.Normalize();
// transform hit-info to world space now:
result.NormalAtHit = n.ToVector3D();// Vector3.TransformNormal(n, m).ToVector3D();
result.TriangleIndices = new System.Tuple<int, int, int>(g.Indices[index], g.Indices[index + 1], g.Indices[index + 2]);
isHit = true;
}
}
index += 3;
}
}
}
if (isHit)
{
hits.Add(result);
}
return isHit;
}
/// <summary>
/// Initial implementation of hittest for billboard. Needs further improvement.
/// </summary>
/// <param name="rayWS"></param>
/// <param name="hits"></param>
/// <returns></returns>
protected override bool OnHitTest(IRenderMatrices context, Ray rayWS, ref List <HitTestResult> hits)
{
var g = this.geometryInternal as IBillboardText;
var h = false;
var result = new HitTestResult();
result.Distance = double.MaxValue;
if (context == null || g.Width == 0 || g.Height == 0)
{
return(false);
}
if (g != null)
{
BoundingBox b = new BoundingBox();
var left = -g.Width / 2;
var right = -left;
var top = -g.Height / 2;
var bottom = -top;
if (FixedSize)
{
var viewportMatrix = context.ViewportMatrix;
var projectionMatrix = context.ProjectionMatrix;
var viewMatrix = context.ViewMatrix;
var visualToScreen = viewMatrix * projectionMatrix * viewportMatrix;
var center = new Vector4(g.Positions[0], 1);
var screenPoint = Vector4.Transform(center, visualToScreen);
var spw = screenPoint.W;
var spx = screenPoint.X;
var spy = screenPoint.Y;
var spz = screenPoint.Z / spw / projectionMatrix.M33;
var matrix = CameraExtensions.InverseViewMatrix(ref viewMatrix);
var width = (float)context.ActualWidth;
var height = (float)context.ActualHeight;
Vector3 v = new Vector3();
var x = spx + left * spw;
var y = spy + bottom * spw;
v.X = (2 * x / width / spw - 1) / projectionMatrix.M11;
v.Y = -(2 * y / height / spw - 1) / projectionMatrix.M22;
v.Z = spz;
Vector3 bl;
Vector3.TransformCoordinate(ref v, ref matrix, out bl);
x = spx + right * spw;
y = spy + bottom * spw;
v.X = (2 * x / width / spw - 1) / projectionMatrix.M11;
v.Y = -(2 * y / height / spw - 1) / projectionMatrix.M22;
v.Z = spz;
Vector3 br;
Vector3.TransformCoordinate(ref v, ref matrix, out br);
x = spx + right * spw;
y = spy + top * spw;
v.X = (2 * x / width / spw - 1) / projectionMatrix.M11;
v.Y = -(2 * y / height / spw - 1) / projectionMatrix.M22;
v.Z = spz;
Vector3 tr;
Vector3.TransformCoordinate(ref v, ref matrix, out tr);
x = spx + left * spw;
y = spy + top * spw;
v.X = (2 * x / width / spw - 1) / projectionMatrix.M11;
v.Y = -(2 * y / height / spw - 1) / projectionMatrix.M22;
v.Z = spz;
Vector3 tl;
Vector3.TransformCoordinate(ref v, ref matrix, out tl);
b = BoundingBox.FromPoints(new Vector3[] { tl, tr, bl, br });
/*
* var visualToScreen = viewport.GetViewProjectionMatrix() * viewport.GetViewportMatrix();
*
* var screenToVisual = visualToScreen.Inverted();
*
* var center = new Vector4(g.Positions[0], 1);
* var screenPoint = Vector4.Transform(center, visualToScreen);
* var spw = screenPoint.W;
* var spx = screenPoint.X;
* var spy = screenPoint.Y;
* var spz = screenPoint.Z;
*
* //Debug.WriteLine(spw);
* // Debug.WriteLine(string.Format("Z={0}; W={1}", spz, spw));
* var bl = new Vector4(spx + left * spw, spy + bottom * spw, spz, spw);
* bl = Vector4.Transform(bl, screenToVisual);
* bl /= bl.W;
*
* var br = new Vector4(spx + right * spw, spy + bottom * spw, spz, spw);
* br = Vector4.Transform(br, screenToVisual);
* br /= br.W;
*
* var tr = new Vector4(spx + right * spw, spy + top * spw, spz, spw);
* tr = Vector4.Transform(tr, screenToVisual);
* tr /= tr.W;
*
* var tl = new Vector4(spx + left * spw, spy + top * spw, spz, spw);
* tl = Vector4.Transform(tl, screenToVisual);
* tl /= tl.W;
*
* b = BoundingBox.FromPoints(new Vector3[] { tl.ToVector3(), tr.ToVector3(), bl.ToVector3(), br.ToVector3() });
*/
}
else
{
var center = new Vector4(g.Positions[0], 1);
var viewMatrix = context.ViewMatrix;
var vcenter = Vector4.Transform(center, viewMatrix);
var vcX = vcenter.X;
var vcY = vcenter.Y;
var bl = new Vector4(vcX + left, vcY + bottom, vcenter.Z, vcenter.W);
var br = new Vector4(vcX + right, vcY + bottom, vcenter.Z, vcenter.W);
var tr = new Vector4(vcX + right, vcY + top, vcenter.Z, vcenter.W);
var tl = new Vector4(vcX + left, vcY + top, vcenter.Z, vcenter.W);
var invViewMatrix = CameraExtensions.InverseViewMatrix(ref viewMatrix);
bl = Vector4.Transform(bl, invViewMatrix);
bl /= bl.W;
br = Vector4.Transform(br, invViewMatrix);
br /= br.W;
tr = Vector4.Transform(tr, invViewMatrix);
tr /= tr.W;
tl = Vector4.Transform(tl, invViewMatrix);
tl /= tl.W;
b = BoundingBox.FromPoints(new Vector3[] { tl.ToVector3(), tr.ToVector3(), bl.ToVector3(), br.ToVector3() });
}
// this all happens now in world space now:
//Debug.WriteLine(string.Format("RayPosition:{0}; Direction:{1};", rayWS.Position, rayWS.Direction));
if (rayWS.Intersects(ref b))
{
float distance;
if (Collision.RayIntersectsBox(ref rayWS, ref b, out distance))
{
h = true;
result.ModelHit = this;
result.IsValid = true;
result.PointHit = (rayWS.Position + (rayWS.Direction * distance)).ToPoint3D();
result.Distance = distance;
Debug.WriteLine(string.Format("Hit; HitPoint:{0}; Bound={1}; Distance={2}", result.PointHit, b, distance));
}
}
}
if (h)
{
hits.Add(result);
}
return(h);
}
/// <summary>
/// Checks if the ray hits the geometry of the model.
/// If there a more than one hit, result returns the hit which is nearest to the ray origin.
/// </summary>
/// <param name="rayWS">Hitring ray from the camera.</param>
/// <param name="result">results of the hit.</param>
/// <returns>True if the ray hits one or more times.</returns>
public virtual bool HitTest(Ray rayWS, ref List <HitTestResult> hits)
{
if (this.Visibility == Visibility.Collapsed)
{
return(false);
}
if (this.IsHitTestVisible == false)
{
return(false);
}
var g = this.Geometry as MeshGeometry3D;
var isHit = false;
var result = new HitTestResult();
result.Distance = double.MaxValue;
if (g != null)
{
var m = this.modelMatrix;
// put bounds to world space
var b = BoundingBox.FromPoints(this.Bounds.GetCorners().Select(x => Vector3.TransformCoordinate(x, m)).ToArray());
//var b = this.Bounds;
// this all happens now in world space now:
if (rayWS.Intersects(ref b))
{
int index = 0;
foreach (var t in g.Triangles)
{
float d;
var p0 = Vector3.TransformCoordinate(t.P0, m);
var p1 = Vector3.TransformCoordinate(t.P1, m);
var p2 = Vector3.TransformCoordinate(t.P2, m);
if (Collision.RayIntersectsTriangle(ref rayWS, ref p0, ref p1, ref p2, out d))
{
if (d > 0 && d < result.Distance) // If d is NaN, the condition is false.
{
result.IsValid = true;
result.ModelHit = this;
// transform hit-info to world space now:
result.PointHit = (rayWS.Position + (rayWS.Direction * d)).ToPoint3D();
result.Distance = d;
var n = Vector3.Cross(p1 - p0, p2 - p0);
n.Normalize();
// transform hit-info to world space now:
result.NormalAtHit = n.ToVector3D();// Vector3.TransformNormal(n, m).ToVector3D();
result.TriangleIndices = new System.Tuple <int, int, int>(g.Indices[index], g.Indices[index + 1], g.Indices[index + 2]);
isHit = true;
}
}
index += 3;
}
}
}
if (isHit)
{
hits.Add(result);
}
return(isHit);
}
