Quad Vertex Array Woes

WakingJohn

Unregistered

Post: #1

Apr 9, 2005 — 02:27 PM

Hey,

I've been messing with this for about two days and can't figure out what I'm doing wrong. Basically its just drawing a few col of the mesh stored in the vertex array instead of drawing the entire square mesh. Heres my code:

Code:

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor3f(1.0f, 1.0f, 1.0f);

// Draw a submesh

    glEnableClientState( GL_VERTEX_ARRAY );

    glVertexPointer( 3, GL_FLOAT, 0, vertices );

    glEnable( GL_TEXTURE_2D );

    glEnable( GL_POLYGON_OFFSET_FILL );

    glEnableClientState( GL_TEXTURE_COORD_ARRAY );

    glTexCoordPointer( 2, GL_FLOAT, 0, textureUV );

    glBindTexture(GL_TEXTURE_2D, texture[0].texID);

    glDrawElements( GL_QUADS, SIZE*SIZE*4, GL_UNSIGNED_BYTE, indices );

    glDisableClientState( GL_VERTEX_ARRAY );

    glDisableClientState( GL_TEXTURE_COORD_ARRAY );

    glDisable( GL_POLYGON_OFFSET_FILL );

and this is my generation of the arrays:

Code:

    int i = 0;

    int j = 0;

    int count = 0;

    int icount = 0;

    int tcount = 0;

    int size = SIZE;

    float mesh_vert_heights[size][size];

    for(i=0;i<size-1;i++)

    {

        for(j=0;j<size-1;j++)

            mesh_vert_heights[j][i] = ((float)rand()/RAND_MAX)*1.5f;

    }

    for(i=0;i<size-1;i++)

    {

        for(j=-1;j<size-1;j++)

        {        

            vertices[count] = j*1.0f; count++; //vertice

            vertices[count] = mesh_vert_heights[j][i];count++;

            vertices[count] = i*1.0f;count++;

            textureUV[tcount] = 1.0f-(float)(j)/size; tcount++;// uv

            textureUV[tcount] = (float)(i)/size; tcount++;

            indices[icount] = icount;                                                    icount++;//vertice for face

            vertices[count] = j*1.0f; count++;

            vertices[count] = mesh_vert_heights[j][1+i]; count++;

            vertices[count] = 1.0f+i*1.0f; count++;

            textureUV[tcount] =  1.0f-(float)(j)/size; tcount++;

            textureUV[tcount] = (float)(i+1)/size; tcount++;

            indices[icount] = icount;

            icount++;

            vertices[count] = 1.0f+j*1.0f; count++;

            vertices[count] = mesh_vert_heights[j+1][1+i]; count++;

            vertices[count] = 1.0f+i*1.0f; count++;

            textureUV[tcount] = 1.0f-(float)(j+1)/size; tcount++;

            textureUV[tcount] = (float)(i+1)/size; tcount++;

            indices[icount] = icount; 

            icount++;

            vertices[count] = 1.0f+j*1.0f; count++;

            vertices[count] = mesh_vert_heights[j+1][i]; count++;

            vertices[count] = i*1.0f; count++;

            textureUV[tcount] =  1.0f-(float)(j+1)/size; tcount++;

            textureUV[tcount] = (float)(i)/size; tcount++;

            indices[icount] = icount; 

            icount++;

        }

    }

This is all done in c++ carbon in xcode with opengl and glut.

Heres an image of whats happening, only with all heights set to 0 to aid in viewing the problem:
http://idiotcollective.com/weirdArray.jpeg

WakingJohn

Unregistered

Post: #2

Apr 9, 2005 — 07:55 PM

Got it.

GLubyte should have been an GL unisgned int since I was dealing with larger values than 255 for the indices.

Thanks!

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