public Vector3f FindSnapPoint(Ray3f ray)
{
DistRay3Segment3 dist = new DistRay3Segment3(ray, segmentW);
dist.GetSquared();
return((Vector3f)dist.SegmentClosest);
}
public bool FindHitEdge(Ray3f sceneRay, MeshEditorOpType.BoundaryType boundaryMode, bool snap_to_center, ref Frame3f hitFrameS, ref int hitEID)
{
Ray3f objRay = SceneTransforms.SceneToObject(Target, sceneRay);
int hit_tri = PreviewSpatial.FindNearestHitTriangle(objRay);
if (hit_tri == DMesh3.InvalidID)
{
return(false);
}
if (allow_backface_hits == false && is_back_facing(hit_tri))
{
return(false);
}
var intr = MeshQueries.TriangleIntersection(PreviewMesh, hit_tri, objRay);
int e_idx = -1; double near_sqr = double.MaxValue; DistRay3Segment3 near_dist = null;
for (int j = 0; j < 3; ++j)
{
Segment3d seg = new Segment3d(intr.Triangle[j], intr.Triangle[(j + 1) % 3]);
DistRay3Segment3 dist = new DistRay3Segment3(objRay, seg);
if (dist.GetSquared() < near_sqr)
{
near_sqr = dist.GetSquared();
near_dist = dist;
e_idx = j;
}
}
int eid = PreviewMesh.GetTriEdge(hit_tri, e_idx);
if (boundaryMode != MeshEditorOpType.BoundaryType.Any)
{
bool is_boundary = PreviewMesh.IsBoundaryEdge(eid);
if ((is_boundary && boundaryMode == MeshEditorOpType.BoundaryType.OnlyInternal) ||
(is_boundary == false && boundaryMode == MeshEditorOpType.BoundaryType.OnlyBoundary))
{
return(false);
}
}
if (snap_to_center)
{
Frame3f hitFrameL = new Frame3f(PreviewMesh.GetEdgePoint(eid, 0.5), PreviewMesh.GetTriNormal(hit_tri));
hitFrameS = SceneTransforms.ObjectToScene(previewSO, hitFrameL);
}
else
{
Frame3f hitFrameL = new Frame3f(near_dist.SegmentClosest, PreviewMesh.GetTriNormal(hit_tri));
hitFrameS = SceneTransforms.ObjectToScene(previewSO, hitFrameL);
}
hitEID = eid;
return(true);
}
public bool FindRayIntersection(Ray3f ray, out float fHitDist)
{
fHitDist = float.PositiveInfinity;
float fHitThreshSqr = 2.0f * fLineWidthW;
fHitThreshSqr *= fHitThreshSqr;
DistRay3Segment3 dist = new DistRay3Segment3(ray, segmentW);
float fDistWSqr = (float)dist.GetSquared();
if (fDistWSqr < fHitThreshSqr)
{
fHitDist = (float)dist.RayParameter;
return(true);
}
return(false);
}
public static bool FindClosestRayIntersection(ISampledCurve3d c, double segRadius, Ray3d ray, out double rayT)
{
rayT = double.MaxValue;
int nNearSegment = -1;
//double fNearSegT = 0.0;
int N = c.VertexCount;
int iStop = (c.Closed) ? N : N - 1;
for (int i = 0; i < iStop; ++i)
{
DistRay3Segment3 dist = new DistRay3Segment3(ray,
new Segment3d(c.GetVertex(i), c.GetVertex((i + 1) % N)));
// raycast to line bounding-sphere first (is this going ot be faster??)
double fSphereHitT;
bool bHitBoundSphere = RayIntersection.SphereSigned(ray.Origin, ray.Direction,
dist.Segment.Center, dist.Segment.Extent + segRadius, out fSphereHitT);
if (bHitBoundSphere == false)
{
continue;
}
// find ray/seg min-distance and use ray T
double dSqr = dist.GetSquared();
if (dSqr < segRadius * segRadius)
{
if (dist.RayParameter < rayT)
{
rayT = dist.RayParameter;
//fNearSegT = dist.SegmentParameter;
nNearSegment = i;
}
}
}
return(nNearSegment >= 0);
}
