blob body type explanations

Download Blob Body Type Explanations

Post on 20-Feb-2017

1.914 views

Category:

Science

0 download

Embed Size (px)

TRANSCRIPT

  • BLOB BODY TYPE

    http://sites.google.com/site/lssoft2011/home

  • BASIC IDEA

    When mesh body type is set to 'blob', extension treats nodal points as a spherical data set.

    http://sites.google.com/site/lssoft2011/home

  • Extension estimates position of an average point from given nodal points and places center of a spherical data set at it.

    BASIC IDEA

    http://sites.google.com/site/lssoft2011/home

  • During interpolation length of radius vectors to unknown points are calculated according to selected interpolation algorithm.

    BASIC IDEA

    http://sites.google.com/site/lssoft2011/home

  • Inverse Distance Weighting

    IDW ALGORITHM

    http://sites.google.com/site/lssoft2011/home

  • IDW ALGORITHM

    Inverse Angle Weighting (IAW) would be a more accurate name because algorithm actually uses angle to measure 'amount of proximity'

    http://sites.google.com/site/lssoft2011/home

  • 'Average' and 'minimize' algorithms

    ITERATIVE ALGORITHMS

    http://sites.google.com/site/lssoft2011/home

  • 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

    http://sites.google.com/site/lssoft2011/home

  • 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

    http://sites.google.com/site/lssoft2011/home

  • 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

    http://sites.google.com/site/lssoft2011/home

  • TREND AND PREDICT

    Mapped surface

    http://sites.google.com/site/lssoft2011/home

  • 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

    http://sites.google.com/site/lssoft2011/home

  • TREND AND PREDICT

    ...then processes mapped set as usual.

    http://sites.google.com/site/lssoft2011/home

  • 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

    http://sites.google.com/site/lssoft2011/home

  • IDW VS PREDICT

    The idea of'predict'algorithm is to estimate surface tangent planes at given nodal points.

    'Predict'

    http://sites.google.com/site/lssoft2011/home

  • IDW VS PREDICT

    Knownpoints arenot necessarilylocal extrema in case when 'predict' algorithm is chosen so result of interpolation can be more convincing.

    http://sites.google.com/site/lssoft2011/home

    1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16