protected override bool OnHitTest(HitTestContext context, Matrix totalModelMatrix, ref List <HitTestResult> hits)
{
return(false);
}
/// <summary>
/// Normal hit test from top to bottom
/// </summary>
/// <param name="context"></param>
/// <param name="model"></param>
/// <param name="modelMatrix"></param>
/// <param name="hits"></param>
/// <returns></returns>
public virtual bool HitTest(HitTestContext context, object model, Matrix modelMatrix, ref List <HitTestResult> hits)
{
return(Octree.HitTest(context, model, null, modelMatrix, ref hits));
}
protected override bool CanHitTest(HitTestContext context)
{
return(false);
}
public virtual bool HitTest(HitTestContext context, Matrix modelMatrix, ref List <HitTestResult> hits, object originalSource)
{
if (Positions == null || Positions.Count == 0 ||
Indices == null || Indices.Count == 0)
{
return(false);
}
var isHit = false;
if (Octree != null)
{
isHit = Octree.HitTest(context, originalSource, this, modelMatrix, ReturnMultipleHitsOnHitTest, ref hits);
}
else
{
var result = new HitTestResult
{
Distance = double.MaxValue
};
var modelInvert = modelMatrix.Inverted();
if (modelInvert == Matrix.Zero)//Check if model matrix can be inverted.
{
return(false);
}
//transform ray into model coordinates
var rayModel = new Ray(Vector3.TransformCoordinate(context.RayWS.Position, modelInvert), Vector3.Normalize(Vector3.TransformNormal(context.RayWS.Direction, modelInvert)));
var b = this.Bound;
//Do hit test in local space
if (rayModel.Intersects(ref b))
{
var index = 0;
var minDistance = float.MaxValue;
foreach (var t in Triangles)
{
// Used when geometry size is really small, causes hit test failure due to SharpDX.MathUtils.ZeroTolerance.
var scaling = 1f;
var rayScaled = rayModel;
if (EnableSmallTriangleHitTestScaling)
{
if ((t.P0 - t.P1).LengthSquared() < SmallTriangleEdgeLengthSquare ||
(t.P1 - t.P2).LengthSquared() < SmallTriangleEdgeLengthSquare ||
(t.P2 - t.P0).LengthSquared() < SmallTriangleEdgeLengthSquare)
{
scaling = SmallTriangleHitTestScaling;
rayScaled = new Ray(rayModel.Position * scaling, rayModel.Direction);
}
}
var v0 = t.P0 * scaling;
var v1 = t.P1 * scaling;
var v2 = t.P2 * scaling;
if (Collision.RayIntersectsTriangle(ref rayScaled, ref v0, ref v1, ref v2, out float d))
{
d /= scaling;
// For CrossSectionMeshGeometryModel3D another hit than the closest may be the valid one, since the closest one might be removed by a crossing plane
if (ReturnMultipleHitsOnHitTest)
{
minDistance = float.MaxValue;
}
if (d >= 0 && d < minDistance) // If d is NaN, the condition is false.
{
minDistance = d;
result.IsValid = true;
result.ModelHit = originalSource;
// transform hit-info to world space now:
var pointWorld = Vector3.TransformCoordinate(rayModel.Position + (rayModel.Direction * d), modelMatrix);
result.PointHit = pointWorld;
result.Distance = (context.RayWS.Position - pointWorld).Length();
var p0 = Vector3.TransformCoordinate(t.P0, modelMatrix);
var p1 = Vector3.TransformCoordinate(t.P1, modelMatrix);
var p2 = Vector3.TransformCoordinate(t.P2, modelMatrix);
var n = Vector3.Cross(p1 - p0, p2 - p0);
n.Normalize();
// transform hit-info to world space now:
result.NormalAtHit = n;// Vector3.TransformNormal(n, m).ToVector3D();
result.TriangleIndices = new System.Tuple <int, int, int>(Indices[index], Indices[index + 1], Indices[index + 2]);
result.Tag = index / 3;
result.Geometry = this;
isHit = true;
if (ReturnMultipleHitsOnHitTest)
{
hits.Add(result);
result = new HitTestResult();
}
}
}
index += 3;
}
}
if (isHit && result.IsValid && !ReturnMultipleHitsOnHitTest)
{
hits.Add(result);
}
}
return(isHit);
}
protected override bool PreHitTestOnBounds(HitTestContext context)
{
return(true);
}
public override bool HitTest(HitTestContext context, object model, Geometry3D geometry, Matrix modelMatrix, ref List <HitTestResult> hits, float hitThickness)
{
needRecalculate = true;
return(base.HitTest(context, model, geometry, modelMatrix, ref hits, hitThickness));
}
/// <summary>
/// Hits the test.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="modelMatrix">The model matrix.</param>
/// <param name="hits">The hits.</param>
/// <param name="originalSource">The original source.</param>
/// <param name="fixedSize">if set to <c>true</c> [fixed size].</param>
/// <returns></returns>
public abstract bool HitTest(HitTestContext context, Matrix modelMatrix, ref List <HitTestResult> hits,
object originalSource, bool fixedSize);
/// <summary>
///
/// </summary>
/// <param name="octant"></param>
/// <param name="context"></param>
/// <param name="model"></param>
/// <param name="geometry"></param>
/// <param name="modelMatrix"></param>
/// <param name="rayModel"></param>
/// <param name="returnMultiple"></param>
/// <param name="hits"></param>
/// <param name="isIntersect"></param>
/// <param name="hitThickness"></param>
/// <returns></returns>
protected override bool HitTestCurrentNodeExcludeChild(ref Octant octant, HitTestContext context, object model,
Geometry3D geometry, Matrix modelMatrix, ref Ray rayModel, bool returnMultiple,
ref List <HitTestResult> hits, ref bool isIntersect, float hitThickness)
{
isIntersect = false;
if (!octant.IsBuilt || context == null)
{
return(false);
}
var isHit = false;
var bound = octant.Bound;
if (rayModel.Intersects(ref bound))
{
isIntersect = true;
if (octant.Count == 0)
{
return(false);
}
var result = new HitTestResult();
result.Distance = double.MaxValue;
if (needRecalculate)
{
var svpm = context.RenderMatrices.ScreenViewProjectionMatrix;
smvpm = modelMatrix * svpm;
needRecalculate = false;
}
var clickPoint = context.HitPointSP.ToVector3() * context.RenderMatrices.DpiScale;
isIntersect = true;
var dist = hitThickness;
var rayWS = context.RayWS;
for (int i = octant.Start; i < octant.End; ++i)
{
var v0 = Positions[Objects[i]];
var p0 = Vector3.TransformCoordinate(v0, smvpm);
var pv = p0 - clickPoint;
var d = pv.Length() / context.RenderMatrices.DpiScale;
if (returnMultiple)
{
dist = hitThickness;
}
if (d < dist) // If d is NaN, the condition is false.
{
dist = d;
result.IsValid = true;
result.ModelHit = model;
var px = Vector3.TransformCoordinate(v0, modelMatrix);
result.PointHit = px;
result.Distance = (rayWS.Position - px).Length();
result.Tag = Objects[i];
result.Geometry = geometry;
isHit = true;
if (returnMultiple)
{
hits.Add(result);
result = new HitTestResult();
}
}
}
if (isHit && !returnMultiple)
{
isHit = false;
if (hits.Count > 0)
{
if (hits[0].Distance > result.Distance)
{
hits[0] = result;
isHit = true;
}
}
else
{
hits.Add(result);
isHit = true;
}
}
}
return(isHit);
}
/// <summary>
///
/// </summary>
/// <param name="octant"></param>
/// <param name="context"></param>
/// <param name="sphere"></param>
/// <param name="result"></param>
/// <param name="isIntersect"></param>
/// <returns></returns>
protected override bool FindNearestPointBySphereExcludeChild(ref Octant octant, HitTestContext context,
ref BoundingSphere sphere, ref List <HitTestResult> result, ref bool isIntersect)
{
bool isHit = false;
var resultTemp = new HitTestResult();
resultTemp.Distance = float.MaxValue;
if (!BoxDisjointSphere(octant.Bound, ref sphere))
{
isIntersect = true;
for (int i = octant.Start; i < octant.End; ++i)
{
var p = Positions[Objects[i]];
if (sphere.Contains(ref p) != ContainmentType.Disjoint)
{
var d = (p - sphere.Center).Length();
if (resultTemp.Distance > d)
{
resultTemp.Distance = d;
resultTemp.IsValid = true;
resultTemp.PointHit = p;
resultTemp.Tag = Objects[i];
isHit = true;
}
}
}
if (isHit)
{
isHit = false;
if (result.Count > 0)
{
if (result[0].Distance > resultTemp.Distance)
{
result[0] = resultTemp;
isHit = true;
}
}
else
{
result.Add(resultTemp);
isHit = true;
}
}
}
else
{
isIntersect = false;
}
return(isHit);
}
public sealed override bool HitTest(HitTestContext context, ref List <HitTestResult> hits)
{
return(false);
}
protected override bool OnHitTest(HitTestContext context, Matrix totalModelMatrix, ref List <HitTestResult> hits)
{
var hitsBeforeCheck = hits?.Count ?? 0;
var meshGeometry3d = Geometry as MeshGeometry3D;
if (meshGeometry3d == null)
{
return(false);
}
if (meshGeometry3d.ReturnMultipleHitsOnHitTest)
{
throw new InvalidOperationException($"All hit tests should be called on the same thread, {nameof(Geometry)}.{nameof(meshGeometry3d.ReturnMultipleHitsOnHitTest)} would not be true if that was the case");
}
meshGeometry3d.ReturnMultipleHitsOnHitTest = true;
var result = meshGeometry3d.HitTest(context, totalModelMatrix, ref hits, this.WrapperSource);
meshGeometry3d.ReturnMultipleHitsOnHitTest = false;
var operation = CuttingOperation;
if (result)
{
switch (operation)
{
case CuttingOperation.Intersect:
// Remove any hit point behinds any of the clip plane.
if (EnablePlane1)
{
result = RemoveHitPointBehindCrossingPlane(Plane1, hits, hitsBeforeCheck);
}
if (result && EnablePlane2)
{
result = RemoveHitPointBehindCrossingPlane(Plane2, hits, hitsBeforeCheck);
}
if (result && EnablePlane3)
{
result = RemoveHitPointBehindCrossingPlane(Plane3, hits, hitsBeforeCheck);
}
if (result && EnablePlane4)
{
result = RemoveHitPointBehindCrossingPlane(Plane4, hits, hitsBeforeCheck);
}
if (result && EnablePlane5)
{
result = RemoveHitPointBehindCrossingPlane(Plane5, hits, hitsBeforeCheck);
}
if (result && EnablePlane6)
{
result = RemoveHitPointBehindCrossingPlane(Plane6, hits, hitsBeforeCheck);
}
if (result && EnablePlane7)
{
result = RemoveHitPointBehindCrossingPlane(Plane7, hits, hitsBeforeCheck);
}
if (result && EnablePlane8)
{
result = RemoveHitPointBehindCrossingPlane(Plane8, hits, hitsBeforeCheck);
}
break;
case CuttingOperation.Subtract:
// Remove any hit point in front of all clip planes
result = RemoveHitPointInFrontOfAllCrossingPlanes(hits, hitsBeforeCheck);
break;
}
if (result)
{
RemoveAllButClosest(hits, hitsBeforeCheck);
}
}
return(result);
}
/// <summary>
/// Determines whether this instance [can hit test] the specified context.
/// </summary>
/// <param name="context">The context.</param>
/// <returns>
/// <c>true</c> if this instance [can hit test] the specified context; otherwise, <c>false</c>.
/// </returns>
protected override bool CanHitTest(HitTestContext context)
{
return(base.CanHitTest(context) && Geometries != null && Geometries.Length > 0 && Materials != null && Materials.Length > 0);
}
public virtual bool HitTestWithSkinnedVertices(HitTestContext context, Vector3[] skinnedVertices, Matrix modelMatrix,
ref List <HitTestResult> hits, object originalSource)
{
if (skinnedVertices == null || skinnedVertices.Length == 0 ||
Indices == null || Indices.Count == 0)
{
return(false);
}
var isHit = false;
var result = new HitTestResult
{
Distance = double.MaxValue
};
var modelInvert = modelMatrix.Inverted();
if (modelInvert == Matrix.Zero)//Check if model matrix can be inverted.
{
return(false);
}
var rayWS = context.RayWS;
//transform ray into model coordinates
var rayModel = new Ray(Vector3.TransformCoordinate(rayWS.Position, modelInvert), Vector3.Normalize(Vector3.TransformNormal(rayWS.Direction, modelInvert)));
var index = 0;
var minDistance = float.MaxValue;
foreach (var t in skinnedTriangles(skinnedVertices))
{
// Used when geometry size is really small, causes hit test failure due to SharpDX.MathUtils.ZeroTolerance.
var scaling = 1f;
var rayScaled = rayModel;
if (EnableSmallTriangleHitTestScaling)
{
if ((t.P0 - t.P1).LengthSquared() < SmallTriangleEdgeLengthSquare ||
(t.P1 - t.P2).LengthSquared() < SmallTriangleEdgeLengthSquare ||
(t.P2 - t.P0).LengthSquared() < SmallTriangleEdgeLengthSquare)
{
scaling = SmallTriangleHitTestScaling;
rayScaled = new Ray(rayModel.Position * scaling, rayModel.Direction);
}
}
var v0 = t.P0 * scaling;
var v1 = t.P1 * scaling;
var v2 = t.P2 * scaling;
if (Collision.RayIntersectsTriangle(ref rayScaled, ref v0, ref v1, ref v2, out float d))
{
if (d >= 0 && d < minDistance) // If d is NaN, the condition is false.
{
minDistance = d;
result.IsValid = true;
result.ModelHit = originalSource;
var pointWorld = Vector3.TransformCoordinate(rayModel.Position + (rayModel.Direction * d), modelMatrix);
result.PointHit = pointWorld;
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;// Vector3.TransformNormal(n, m).ToVector3D();
result.TriangleIndices = new System.Tuple <int, int, int>(Indices[index], Indices[index + 1], Indices[index + 2]);
result.Tag = index / 3;
result.Geometry = this;
isHit = true;
if (ReturnMultipleHitsOnHitTest)
{
hits.Add(result);
result = new HitTestResult();
}
}
}
index += 3;
}
if (isHit)
{
hits.Add(result);
}
return(isHit);
}
protected override bool PreHitTestOnBounds(HitTestContext context)
{
return(BoneMatrices.Length == 0 ? base.PreHitTestOnBounds(context) : true);
}
