private bool IsHole(IFace2 face)
{
ISurface surf = face.IGetSurface();
if (surf.IsCylinder())
{
double[] uvBounds = face.GetUVBounds() as double[];
double[] evalData = surf.Evaluate((uvBounds[1] - uvBounds[0]) / 2, (uvBounds[3] - uvBounds[2]) / 2, 1, 1) as double[];
double[] pt = new double[] { evalData[0], evalData[1], evalData[2] };
int sense = face.FaceInSurfaceSense() ? 1 : -1;
double[] norm = new double[] { evalData[evalData.Length - 3] * sense, evalData[evalData.Length - 2] * sense, evalData[evalData.Length - 1] * sense };
double[] cylParams = surf.CylinderParams as double[];
double[] orig = new double[] { cylParams[0], cylParams[1], cylParams[2] };
double[] dir = new double[] { pt[0] - orig[0], pt[1] - orig[1], pt[2] - orig[2] };
IMathUtility mathUtils = swApp.IGetMathUtility();
IMathVector dirVec = mathUtils.CreateVector(dir) as IMathVector;
IMathVector normVec = mathUtils.CreateVector(norm) as IMathVector;
return(GetAngle(dirVec, normVec) < Math.PI / 2);
}
else
{
throw new NotSupportedException("Only cylindrical face is supported");
}
}
