Algorithms

The main "skeleton" of the program is as follows:

Begin
{
    Open .WRL file
    if opening .WRL file = error then end
    if opening .WRL file = fine then continue
    Search for VRML input
    {
        if VRML input = 'Material' then Search for more data
        {
            if VRML input = 'diffuseColor' then get RGB data
            else exit 'Material' and continue searching
        }
        if VRML input = 'Translation' then search for more data
        {
            if VRML input = 'translation' then get translation data
            else exit 'Translation' and continue searching
        }
        if VRML input = 'Rotation' then search for more data
        {
            if VRML input = 'rotation' then get rotation data
            else exit 'rotation' and continue searching
        }
        if VRML input = 'Cylinder' then search for more data
        {
            if VRML input = 'height' then get height data
            if VRML input = 'radius' then get radius data
            else exit 'Cylinder' and continue searching
        }
        if VRML input = 'Cone' then search for more data
        {
            if VRML input = 'height' then get height data
            if VRML input = 'radius' then get radius data
            else exit 'Cone' and continue searching
        }
        if VRML input = 'Cube' then search for more data
        {
            if VRML input = 'height' then get height data
            if VRML input = 'depth' then get depth data
            if VRML input = 'width' then get width data
            generate cube definition
            else exit 'Cube' and continue searching
        }
        if VRML input = 'Sphere' then search for more data
        {
            if VRML input = 'radius' then get radius data
            else exit 'Sphere' and continue searching
        }
        if VRML input = 'Coordinate3' then search for more data
        {
            if VRML input = 'Point' then get point definitions
            else exit 'Coordinate3' and continue searching
        }
        if VRML input = 'IndexedFaceSet' then search for more data
        {
            if VRML input = 'coordIndex' then get face definitions
            else exit 'IndexedFaceSet' and continue searching
        }
    }
    start .SAT file generation
    calculate transformation vector using data from 'Translation' and 'Rotation'
    write transformation vector and RGB color definition on ACIS file
    write general features: body, lump, shell
 
    if VRML input = 'Cone' or 'Sphere' or 'Cylinder'
    {
        generate basic ACIS primitive:
        {
            use data from 'radius' and 'height' to define the main ACIS points
            generate the main vertices
            generate coedges, edges, loops and faces
            write .SAT file
        }
    }
    if VRML input = 'Cube' or 'IndexedFaceSet'
    {
        generate ACIS polyhedron:
        {
            use data from 'Point' to define the main points
            assign vertices to these points
            generate coedges and loops using data from 'IndexedFaceSet' and vertices
            generate edges from coedges definition and orient coedges
            calculate curves' definition from edge and vertex definition
            generate faces from loop and edge definitions
            calculate face definition using data from coedge definition
            write .SAT file
        }
    }
End

Here it is important to point out that ACIS data structute is not sequential. This means that ACIS makes reference to entities on any position within the file to define another. The file writing in C is sequential, therefore, we’ll need to keep all ACIS data and definitions in memory before actually writing the ACIS file. We have an example of a VRML and ACIS file in figure 3.

For further reference the source code is included here: project.cpp

You can download the .EXE file: proyecto.exe

 
 
 
 
    }