Path: chuka.playstation.co.uk!news
From: "Matthew Hardingham" <MatthewHardingham@RebelWareInteractive.Freeserve.co.uk>
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Elevation data
Date: Wed, 8 Dec 1999 15:40:58 -0000
Organization: PlayStation Net Yaroze (SCEE)
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Right here we go then,

At the moment I have a set of elevation points stored in an array (128x128)
from this I'm creating a link list of vertices.
For some reason it is running very slow or the program is crashing out.
Why ?
It's bugging me me now.

Here's the vertex structure --

    /* Vertex list */
    typedef struct Vertex {
        unsigned short IdxX, IdxZ;
        VECTOR Vert;                  /* Vector */
        struct Vertex *Next;
    } VERTEX;


Heres a snippet of code where the elevation data is extracted from the
array --

    /* Loop through the mesh */
    for(MeshZ=0; MeshZ<MESH_SIZE; MeshZ++)
    {
        for(MeshX=0; MeshX<MESH_SIZE; MeshX++)
        {
            NewVert = AllocateVertex();

            NewVert->IdxX = BlockX;
            NewVert->IdxZ = BlockZ;

            printf("\n Z - %ld X - %ld", MeshZ, MeshX);

            /* Set vertices values */
            NewVert->Vert.vx = (MeshX*MESH_INTERVAL);
            NewVert->Vert.vy = HeightArray[MeshZ][MeshX];
            NewVert->Vert.vz = (MeshZ*MESH_INTERVAL);

            /* Change the pointers and link list positions */
            CurrentVert->Next = NewVert;
            NewVert->Next = NULL;
            CurrentVert = NewVert;
         }
    }

Here's the allocation part ---

    /* Vertex memory allocation */
    VERTEX *AllocateVertex(void)
    {
        VERTEX *V = NULL;

        V = (VERTEX *)malloc(sizeof(VERTEX));

        V->IdxX = 0; V->IdxZ = 0;

        /* Vertice values */
        V->Vert.vx = 0; V->Vert.vy = 0; V->Vert.vz = 0;

        V->Next = NULL;

        return(V);
    }