public static BezierSurfaceWorldObject CreateFlatGrid(
int segmentsU,
int segmentsV,
double width,
double height
)
{
var surface = new BezierSurfaceWorldObject
{
_segmentsU = segmentsU,
_segmentsV = segmentsV,
};
surface.SetupVirtualPointsGrid(
3 * segmentsU + 1,
3 * segmentsV + 1,
width,
height
);
return(surface);
}
public static BezierSurfaceWorldObject CreateCylindrical(
int segmentsU,
int segmentsV,
double radius,
double height
)
{
var surface = new BezierSurfaceWorldObject
{
_segmentsU = segmentsU,
_segmentsV = segmentsV,
_folded = true,
};
surface.SetupVirtualPointsCylinder(
3 * segmentsU + 1,
3 * segmentsV,
radius,
height
);
return(surface);
}
public static List <VirtualPoint> FindHoleOutline(
List <BezierSurfaceWorldObject> gregoryAdjacentPatches
)
{
var outline = new List <VirtualPoint>();
BezierSurfaceWorldObject lastProcessedPatch = null;
var nonProcessedPatches = new LinkedList <BezierSurfaceWorldObject>(
gregoryAdjacentPatches
);
var currentPatch = nonProcessedPatches.First();
while (nonProcessedPatches.Count > 0)
{
nonProcessedPatches.Remove(currentPatch);
var importantCollapsedPoints = currentPatch._virtualPoints
.Where(t => gregoryAdjacentPatches.Intersect(
GetAdjacentSurfaces(t)
).Count() >= 2
)
.ToList();
if (importantCollapsedPoints.Count != 2)
{
return(new List <VirtualPoint>());
}
/*
* throw new ApplicationException(string.Join(
* "Expected two shared points between adjacent patches,",
* $" but found ${importantCollapsedPoints.Count}."
* ));*/
if (lastProcessedPatch != null)
{
var firstPoint = importantCollapsedPoints.First();
if (!GetAdjacentSurfaces(firstPoint)
.Contains(lastProcessedPatch))
{
importantCollapsedPoints.Reverse();
}
}
if (lastProcessedPatch == null)
{
outline.Add(importantCollapsedPoints[0]);
}
var a = currentPatch.GetVirtualPointCoordinate(
importantCollapsedPoints[0]
);
var b = currentPatch.GetVirtualPointCoordinate(
importantCollapsedPoints[1]
);
for (var i = 1; i < 3; ++i)
{
var xcoord = (a.Item1 * (3 - i) + b.Item1 * i) / 3;
var ycoord = (a.Item2 * (3 - i) + b.Item2 * i) / 3;
outline.Add(currentPatch.GetVirtualPoint(xcoord, ycoord));
}
if (nonProcessedPatches.Count > 0)
{
outline.Add(importantCollapsedPoints[1]);
}
lastProcessedPatch = currentPatch;
currentPatch = GetAdjacentSurfaces(
importantCollapsedPoints[1]
).First(t => t != lastProcessedPatch);
}
return(outline);
}
