Download - Blob Body Type Explanations
BASIC IDEA
When mesh body type is set to 'blob', extension treats nodal points as a spherical data set.
Extension estimates position of an average point from given nodal points and places center of a spherical data set at it.
BASIC IDEA
During interpolation length of radius vectors to unknown points are calculated according to selected interpolation algorithm.
BASIC IDEA
IDW ALGORITHM
Inverse Angle Weighting (IAW) would be a more accurate name because algorithm actually uses angle to measure 'amount of proximity'
'Average' and 'minimize' algorithms
ITERATIVE ALGORITHMS
First stage is a preliminary calculation, which sets the same length to a radius vector to a point being calculated as a length of a vector to a closest* known nodal point.
ITERATIVE ALGORITHMS
* - «closest» in terms of spherical coordinate system here
The second stage is an iterative smoothing itself: points within a cell size angle from known points stay where they are, others gradually move along their radius vectors.
ITERATIVE ALGORITHMS
So the process is similar to the one that takes place during conventional 'terrain-like' mesh processing. It is just adapted a bit for spherical coordinate system.
ITERATIVE ALGORITHMS
Adaptation of thesealgorithms for spherical coordinate system is a bit more tricky. Extension maps given points to Cartesian coordinate system at first...
TREND AND PREDICT
TREND AND PREDICT
...then processes mapped set as usual.
IDW VS PREDICT
Radius vectorto each givennodal point is normal to a surface tangent plane at this point, when algorithm is set to IDW. So known points are local extrema.
IDW
IDW VS PREDICT
The idea of'predict'algorithm is to estimate surface tangent planes at given nodal points.
'Predict'
IDW VS PREDICT
Knownpoints arenot necessarilylocal extrema in case when 'predict' algorithm is chosen so result of interpolation can be more convincing.
