SHAPEFILES

Compiled by KD

Description

SHAPEFILES is a directory where, as its name suggests, shape files are stored. Out of the many shape files that can be stored in SHAPEFILES, SPC will only use one shape model at a time and that is SHAPE.TXT.

SHAPE.TXT is the main shape model that all of SPC uses. The first line is the Q size (between 8 and 512 in factor of 2 increments: 8, 16, 32, 64, 128, 256, 512). The shape is in the ICQ format, which is basically a 6 sided cube.

Each subsequent line gives the vector of the surface. Bob has made a new routine (equalize) that helps distribute the vectors evenly. The vectors are in Cartesian space (x, y, z).

SHAPE00.TXT is the "baseline" shape model. This can be used to keep track of how far the new shape gets from the starting shape. Usually, it is turned off part way through the mission by INIT_LITHOS.TXT.

A useful tip for the user is to use a symbolic link to specific the SHAPE.TXT. Thus, the user can keep a useful filename in the directory, but "link" that to SHAPE.TXT so SPC works.

How to Link Models

cd SHAPEFILES
ln -s <realfile> SHAPE.TXT

Example and Further Description of a Shape Model

         512
  -278.04003   278.04003   268.57872
  -276.88948   278.59369   269.11354
  -275.73912   279.14388   269.64501
  -274.58894   279.69061   270.17314
  -273.43898   280.23391   270.69794
  -272.28923   280.77377   271.21943
  -271.13971   281.31022   271.73763
  -269.99043   281.84328   272.25255
  -268.84141   282.37296   272.76420
  -267.69265   282.89927   273.27260
...

First line is Q (resolution). This gives the number of nodes for i and j. Multiple it by 6 coordinate vector spaces to fill out the entire region. Note: Q*Q*6 is the total number of nodes, and line entries in this file. A Q of 512 is the largest that we represent. It contains 1.5 million vertices and 56 MB uncompressed.

Second line and following: The location of a vertex in i, j, k space (Cartesian coordinates).