/// sample the span unfirormly with tolerance sampling
// this samples the Span and pushes the corresponding sampled points to bdc
private void sample_span(Span span)
{
Debug.Assert(sampling > 0.0);
uint num_steps = (uint)(span.length2d() / sampling + 1);
for (uint i = 0; i <= num_steps; i++)
{
double fraction = (double)i / num_steps;
Point ptmp = span.getPoint(fraction);
CLPoint p = new CLPoint(ptmp.x, ptmp.y, ptmp.z);
p.z = minimumZ;
subOp[0].appendPoint(p);
if (p != null)
{
p.Dispose();
}
}
}
