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zauron

heightmap

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I am working on a heightmap, first i am trying to render it flat, but i am having trouble. i cant even make a 3x3 My render looks like this
void Terrain::draw(){
  // plassering
  D3DXMATRIX matWorld;
  D3DXMatrixIdentity(&matWorld);
  g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );

  g_pd3dDevice->SetMaterial( material );
  g_pd3dDevice->SetStreamSource( 0, vb, 0, sizeof(Vertex) );
  g_pd3dDevice->SetIndices(ib);
  g_pd3dDevice->SetFVF( VERTEXFORMAT );

  //g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, w*h, 0, (w-1)*(h-1)*2);
  g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 9, 0, 8);
}


I build my Vertex buffer and index buffer like this
void Terrain::init(int ww, int hh){
  w = ww;
  h = hh;
  data = new char[w*h];
}

void Terrain::generate(){
  Vertex *vdata;      // pointer to the data in th VertexBuffer
  int *idata;         // pointer to the index data;
  int i = 0;
  // create vb
  g_pd3dDevice->CreateVertexBuffer(w*h*sizeof(Vertex), 0, VERTEXFORMAT, D3DPOOL_DEFAULT, &vb, NULL);
  // create IndexBuffer
  g_pd3dDevice->CreateIndexBuffer((w-1)*(h-1)*6, 0, D3DFMT_INDEX16, D3DPOOL_DEFAULT, &ib, NULL);
  // legge på plass verticene og fylle data
  vb->Lock( 0, 0, (void**)&vdata, 0 );
  for(int x=0; x < w; x++){
   for(int y=0; y < h; y++){
    data[x+y*w] = rand()%255;
    vdata[x+y*w].diffuse = 0xFFFFFF44;
    vdata[x+y*w].position.x = (float)-w/2.0f+(float)x*4.0f;
    vdata[x+y*w].position.y = 2.0f;//data[x+y*w]*0.1f; 
    vdata[x+y*w].position.z = (float)-h/2.0f+(float)y*4.0f;;
    vdata[x+y*w].normal.x = 0;
    vdata[x+y*w].normal.y = 1; 
    vdata[x+y*w].normal.z = 0;
   }
  }
  vb->Unlock();
  // lage indexarray
  ib->Lock( 0, 0, (void**)&idata, 0 );
  for(int x=0; x < w-1; x++){
   for(int y=0; y < h-1; y++){
    idata[i++] = x+y*w;
    idata[i++] = x+y*w+1;
    idata[i++] = x+y*w+w;

    idata[i++] = x+y*w+w+1;
    idata[i++] = x+y*w+w;
    idata[i++] = x+y*w+1;
   }
  }
  ib->Unlock();  
}


The result should be something like
_______
|/|/|/|
|/|/|/|
|/|/|/|



instead i get this

__
|/_
| /
|/


cant figure out what is wrong, Tried writing all the data to file and "render" it on paper, and everything is the way it should be there :(

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Try this approch:


Vertex *vdata = NULL;
:

lock(..)
loop
{
vdata->diffuse = 0xFFFFFF44;
vdata->position.x = (float)-w/2.0f+(float)x*4.0f;
:
vdata++;
}
unlock(..)

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if w and h are in terms of quads, then:

g_pd3dDevice->CreateVertexBuffer(w*h*sizeof(Vertex)...
should be:
g_pd3dDevice->CreateVertexBuffer((w+1)*(h+1))*sizeof(Vertex)...
because this is the number of vertices (and you're using indices), not the number of quads.

and:
g_pd3dDevice->CreateIndexBuffer((w-1)*(h-1)*6...
should be:
g_pd3dDevice->CreateIndexBuffer(w*h*6...

The looping routine looks right at first glance. Show us the code you use to render the primitives.

Chris

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Tried Milles suggestion, with no sucess. Got the same result.

The rendering code is in the first codeblock in original post.

wrote all the data to a file and it looks like this


Vertexbuffer
0 -1.5 2 -1.5
1 2.5 2 -1.5
2 6.5 2 -1.5
3 -1.5 2 2.5
4 2.5 2 2.5
5 6.5 2 2.5
6 -1.5 2 6.5
7 2.5 2 6.5
8 6.5 2 6.5
Indexbuffer
0 1 3
4 3 1
1 2 4
5 4 2
3 4 6
7 6 4
4 5 7
8 7 5





[Edited by - zauron on September 27, 2004 4:37:11 AM]

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if anyone is interested i fixed it, the problem was i used a int pointer to my indexbuffer, but the indexes was only 16bit...

Changing it to 32 bit or the int to WORD and i get just what i want

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