public BBox TransformBBox(BBox b)
{
var ret = BBox.FromPoint(TransformPoint(new Point(b.Min.X, b.Min.Y, b.Min.Z)));
ret = BBox.Union(ret, TransformPoint(new Point(b.Max.X, b.Min.Y, b.Min.Z)));
ret = BBox.Union(ret, TransformPoint(new Point(b.Min.X, b.Max.Y, b.Min.Z)));
ret = BBox.Union(ret, TransformPoint(new Point(b.Min.X, b.Min.Y, b.Max.Z)));
ret = BBox.Union(ret, TransformPoint(new Point(b.Min.X, b.Max.Y, b.Max.Z)));
ret = BBox.Union(ret, TransformPoint(new Point(b.Max.X, b.Max.Y, b.Min.Z)));
ret = BBox.Union(ret, TransformPoint(new Point(b.Max.X, b.Min.Y, b.Max.Z)));
ret = BBox.Union(ret, TransformPoint(new Point(b.Max.X, b.Max.Y, b.Max.Z)));
return(ret);
}
public BBox MotionBounds(BBox b, bool useInverse)
{
if (!_actuallyAnimated)
{
return(Transform.Invert(_startTransform).TransformBBox(b));
}
BBox ret = BBox.Empty;
const int nSteps = 128;
for (int i = 0; i < nSteps; ++i)
{
Transform t;
float time = MathUtility.Lerp(i / (float)(nSteps - 1), _startTime, _endTime);
Interpolate(time, out t);
if (useInverse)
{
t = Transform.Invert(t);
}
ret = BBox.Union(ret, t.TransformBBox(b));
}
return(ret);
}