public bool HitsCircle(Circle3d circle, double tmin, double tmax, ref RayHit3d hit)
{
var dc = circle.Normal.Dot(Direction);
var dw = circle.Normal.Dot(circle.Center - Origin);
// If parallel to plane
if (dc == 0.0)
{
return(false);
}
var t = dw / dc;
if (!ComputeHit(t, tmin, tmax, ref hit))
{
return(false);
}
if (V3d.Distance(hit.Point, circle.Center) > circle.Radius)
{
hit.Point = V3d.NaN;
hit.T = tmax;
return(false);
}
return(true);
}
// searches for oversized triangles and removes and adds all 3 vertex indices to invalid point list
// (if one triangle side > maxTriangleSize => skip whole triangle)
public static int[] GetAllPositionsFromOversizedTriangles(int[] invalidpositions, VertexGeometry vg, float maxTriangleSize)
{
var invalidPoints = new List <int>(invalidpositions);
foreach (var t in vg.Triangles)
{
V3d p0, p1, p2;
t.GetVertexPositions(out p0, out p1, out p2);
if (p0.IsNaN || p1.IsNaN || p2.IsNaN)
{
continue;
}
double dist_p0p1 = V3d.Distance(p0, p1);
double dist_p0p2 = V3d.Distance(p0, p2);
double dist_p1p2 = V3d.Distance(p1, p2);
if ((dist_p0p1 > maxTriangleSize) || (dist_p0p2 > maxTriangleSize) || (dist_p1p2 > maxTriangleSize))
{
foreach (var index in t.VertexIndices)
{
if (!Array.Exists(invalidPoints.ToArray(), x => x == index))
{
invalidPoints.Add(index);
}
}
}
}
return(invalidPoints.ToArray());
}
public static double GetMinimalDistance(V3d p, V3d position, V3d direction, double majorRadius, double minorRadius)
{
var plane = new Plane3d(direction, position);
var planePoint = p.GetClosestPointOn(plane);
var distanceOnPlane = (V3d.Distance(planePoint, position) - majorRadius).Abs();
var distanceToCircle = (V3d.DistanceSquared(planePoint, p) + distanceOnPlane.Square()).Sqrt();
return((distanceToCircle - minorRadius).Abs());
}
public V3d GetClosestPoint(V3d point)
{
var ray = new Ray3d(Origin, Direction);
var cp = point.GetClosestPointOn(ray);
var radius = GetRadius(GetHeight(point));
var dir = (point - cp).Normalized * radius;
var p0 = cp + dir;
var p1 = point.GetClosestPointOn(new Ray3d(Origin, (p0 - Origin).Normalized));
return((V3d.Distance(point, p1) < V3d.Distance(point, p0)) ? p1 : p0);
}
/// <summary>
/// Gets Triangle Set loaded from AaraData and transformed to global space.
/// Triangles side length < maxTriiangleSize
/// </summary>
public static TriangleSet LoadPatchTriangleSetWithoutOversizedTriangles(PatchFileInfo info, string basePath, PositionsType posType, float maxTriangleSize = float.PositiveInfinity)
{
var vg = LoadPatch(info, basePath, posType, false, false, false, false);
if (vg == null)
{
return(new TriangleSet());
}
vg.Transform(
posType == PositionsType.V3dPositions ?
info.Local2Global : info.Local2Global2d);
var triangles = vg.Triangles
.Where(x => !x.Point0.Position.IsNaN &&
!x.Point1.Position.IsNaN &&
!x.Point2.Position.IsNaN &&
(V3d.Distance(x.Point0.Position, x.Point1.Position) < maxTriangleSize) &&
(V3d.Distance(x.Point0.Position, x.Point2.Position) < maxTriangleSize) &&
(V3d.Distance(x.Point1.Position, x.Point2.Position) < maxTriangleSize))
.Select(x => x.ToTriangle3d());
return(new TriangleSet(triangles));
}
/// <summary>
/// if zero, point is located on cone
/// </summary>
public double GetDistance(V3d point)
{
return(V3d.Distance(point, GetClosestPoint(point)));
}
/// <summary> /// if zero, point is located on cone /// </summary> public double GetDistance(V3d point) => V3d.Distance(point, GetClosestPoint(point));
public bool HitsCylinder(Cylinder3d cylinder,
double tmin, double tmax,
ref RayHit3d hit)
{
var axisDir = cylinder.Axis.Direction.Normalized;
// Vector Cyl.P0 -> Ray.Origin
var op = Origin - cylinder.P0;
// normal RayDirection - CylinderAxis
var normal = Direction.Cross(axisDir);
var unitNormal = normal.Normalized;
// normal (Vec Cyl.P0 -> Ray.Origin) - CylinderAxis
var normal2 = op.Cross(axisDir);
var t = -normal2.Dot(unitNormal) / normal.Length;
var radius = cylinder.Radius;
if (cylinder.DistanceScale != 0)
{ // cylinder gets bigger, the further away it is
var pnt = GetPointOnRay(t);
var dis = V3d.Distance(pnt, this.Origin);
radius = ((cylinder.Radius / cylinder.DistanceScale) * dis) * 2;
}
// between enitre rays (caps are ignored)
var shortestDistance = Fun.Abs(op.Dot(unitNormal));
if (shortestDistance <= radius)
{
var s = Fun.Abs(Fun.Sqrt(radius.Square() - shortestDistance.Square()) / Direction.Length);
var t1 = t - s; // first hit of Cylinder shell
var t2 = t + s; // second hit of Cylinder shell
if (t1 > tmin && t1 < tmax)
{
tmin = t1;
}
if (t2 < tmax && t2 > tmin)
{
tmax = t2;
}
hit.T = t1;
hit.Point = GetPointOnRay(t1);
// check if found point is outside of Cylinder Caps
var bottomPlane = new Plane3d(cylinder.Circle0.Normal, cylinder.Circle0.Center);
var topPlane = new Plane3d(cylinder.Circle1.Normal, cylinder.Circle1.Center);
var heightBottom = bottomPlane.Height(hit.Point);
var heightTop = topPlane.Height(hit.Point);
// t1 lies outside of caps => find closest cap hit
if (heightBottom > 0 || heightTop > 0)
{
hit.T = tmax;
// intersect with bottom Cylinder Cap
var bottomHit = HitsPlane(bottomPlane, tmin, tmax, ref hit);
// intersect with top Cylinder Cap
var topHit = HitsPlane(topPlane, tmin, tmax, ref hit);
// hit still close enough to cylinder axis?
var distance = cylinder.Axis.Ray3d.GetMinimalDistanceTo(hit.Point);
if (distance <= radius && (bottomHit || topHit))
{
return(true);
}
}
else
{
return(true);
}
}
hit.T = tmax;
hit.Point = V3d.NaN;
return(false);
}
// searches for oversized triangles and adds only invalid indices to invalid point list
// (keep vertex indices for triangle side < maxTriangleSize)
public static int[] GetInvalidPositionsFromOversizedTriangles(int[] invalidpositions, VertexGeometry vg, float maxTriangleSize)
{
var invalidPoints = new List <int>(invalidpositions);
foreach (var t in vg.Triangles)
{
V3d p0, p1, p2;
t.GetVertexPositions(out p0, out p1, out p2);
if (p0.IsNaN || p1.IsNaN || p2.IsNaN)
{
continue;
}
List <V3d> vertexlist = new List <V3d>();
int p0_counter = 0;
int p1_counter = 0;
int p2_counter = 0;
if (V3d.Distance(p0, p1) > maxTriangleSize)
{
vertexlist.Add(p0); vertexlist.Add(p1);
}
if (V3d.Distance(p0, p2) > maxTriangleSize)
{
vertexlist.Add(p0); vertexlist.Add(p2);
}
if (V3d.Distance(p1, p2) > maxTriangleSize)
{
vertexlist.Add(p1); vertexlist.Add(p2);
}
foreach (var p in vertexlist)
{
if (p == p0)
{
p0_counter++;
}
if (p == p1)
{
p1_counter++;
}
if (p == p2)
{
p2_counter++;
}
}
if ((p0_counter > 1) && (!Array.Exists(invalidPoints.ToArray(), x => x == t.VertexIndex0)))
{
invalidPoints.Add(t.VertexIndex0);
}
if ((p1_counter > 1) && (!Array.Exists(invalidPoints.ToArray(), x => x == t.VertexIndex1)))
{
invalidPoints.Add(t.VertexIndex1);
}
if ((p2_counter > 1) && (!Array.Exists(invalidPoints.ToArray(), x => x == t.VertexIndex2)))
{
invalidPoints.Add(t.VertexIndex2);
}
}
return(invalidPoints.ToArray());
}
