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shakazed

GAH! Heightmaps

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I have a slight problem when it gets to rendering my heightmap. I think it´s something wrong with the index buffer since drawindexedprimitive fails. Here´s the code for initializing vertexbuffer and indexbuffer.
CUSTOMVERTEX vertices[128*128];

	for(int i = 0; i<128; ++i)
	{
		for(int j = 0; j<128; ++j)
		{
	
			vertices[TERRAIN_Z*i+j].x = (float)j;
			vertices[TERRAIN_Z*i+j].y = 0.0f;//iHeightMapArray[i*TERRAIN_Z+j];

			vertices[TERRAIN_Z*i+j].z = (float)i;
			vertices[TERRAIN_Z*i+j].d3dColor = D3DCOLOR_XRGB(0,255,0);
		}
	}


	if(FAILED(p_iD3DDevice9->CreateVertexBuffer((128*128)*sizeof(CUSTOMVERTEX),
		0, CUSTOMVERTEX_FVF, D3DPOOL_DEFAULT,&p_iD3DVertexBuffer9,NULL)))
	{
		MessageBox(NULL, "Can´t create vertexbuffer","Error", MB_OK);
		return false;
	}
	
	
	VOID* pVertices;
	if( FAILED(p_iD3DVertexBuffer9->Lock( 0, sizeof(vertices), (void**)&pVertices, 0 ) ) )
		return false;

	memcpy( pVertices, vertices, sizeof(vertices) );
	p_iD3DVertexBuffer9->Unlock();


	
	
	//Now set up the index buffer


	long dIndices[127*127*6];


	long dPos = 0;

	for(int y = 0;y < 127;++y)
	{
		dPos = 0;

		for(int x = 0;x < 127;++x)
		{
			dIndices[TERRAIN_Z*y+dPos] = x + y * (TERRAIN_X + 1);	
			dPos++; //Go next

			dIndices[TERRAIN_Z*y+dPos]= x + 1 + y * (TERRAIN_X + 1);					//v2

			dPos++; //Go next

			dIndices[TERRAIN_Z*y+dPos] = x + 1 + (y + 1) * (TERRAIN_X + 1);				//v4

			dPos++; //Go next

			dIndices[TERRAIN_Z*y+dPos] = x + y * (TERRAIN_X + 1);					//v1

			dPos++; //Go next

			dIndices[TERRAIN_Z*y+dPos] = x + 1 + (y + 1) * (TERRAIN_X + 1);				//v4

			dPos++; //Go next

			dIndices[TERRAIN_Z*y+dPos] = x + (y + 1) * (TERRAIN_X + 1);					//v3

			dPos++;
		}
	}

	if(FAILED(p_iD3DDevice9->CreateIndexBuffer((127*127*6)*sizeof(long),0,D3DFMT_INDEX16,D3DPOOL_MANAGED,
		&p_iD3DIndexBuffer9,NULL)))
	{
		MessageBox(NULL,"Failed to create index buffer", "Error", MB_OK);
		return false;
	}

	VOID *p_vData;
	if(FAILED(p_iD3DIndexBuffer9->Lock(0,sizeof(dIndices),(VOID**)&p_vData,0)))
	{
		MessageBox(NULL,"Failed to lock index buffer", "Error", MB_OK);
		return false;
	}
	memcpy(p_vData,dIndices,sizeof(dIndices));					//copy data

	p_iD3DIndexBuffer9->Unlock();	

	return true;

And this is the code I use to present the scene.
	p_iD3DDevice9->Clear(0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(0,0,255),1.0f,0);

	p_iD3DDevice9->BeginScene();
	SetupMatrices(); //Setup camera 

	
	// Set the location source of our vertex input stream

	p_iD3DDevice9->SetStreamSource( 0, p_iD3DVertexBuffer9,0, sizeof(CUSTOMVERTEX));
		
	// Set the location of our index information to our Index Buffer

	if(FAILED(p_iD3DDevice9->SetIndices( p_iD3DIndexBuffer9 )))
	{
		MessageBox(NULL,"Couldn´t set indices", "Error", MB_OK);
		return false;
	}


	if(FAILED(p_iD3DDevice9->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,
					   0,
					   0,
					   127*127*2*3,
					   0,
					   127*127*2)))
	{
		MessageBox(NULL,"Failed to draw indexed primitive", "Error", MB_OK);
		return false;
	}



	p_iD3DDevice9->EndScene();

	RECT rRect;
	rRect.left = 0;
	rRect.top  = 0;
	rRect.right = 480;
	rRect.bottom = 480;

	//Render only from and to the given rect

	p_iD3DDevice9->Present(&rRect,&rRect,NULL,NULL);

	return true;

Have tried all sorts of things but there´s prolly something wrong in my thinking then Any help REALLY appreciated.

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The stuff where you fill in the index buffer looks kind of weird. have you tested it on a smaller size array and examined the contents for correctness after the loops run (not actually renedering anything)?

What are TERRAIN_Z and TERRAIN_X? Why does TERRAIN_Z appear in dIndices[TERRAIN_Z*y+dPos] ? Shouldn''t dPos = 0; appear in the x loop, not the y loop? Does a manually coded small test index buffer render correctly?

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TERRAIN_Z and _X are just constants that hold the height and width of the terrain, in this case 128*128. dPos = 0 has to appear in the y loop, it holds the position when creating the six six indices. Also tried to render just one primitive but that failed also.

[edited by - shakazed on July 6, 2003 4:36:45 AM]

[edited by - shakazed on July 6, 2003 6:17:54 AM]

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