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# index buffers

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Hi all, Would I need seperate index buffers for each line of quads in my terrain i.e. for each row of quads and then have seperate calls to DrawIndexedPrimitive for each row ? Such as:

m_pDevice->SetIndices(m_pIndexBuffer);

m_pDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,0,0,10,0,8);

m_pDevice->SetIndices(m_pIndexBufferNextRow);
m_pDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,0,0,10,0,8);


Or, could I just use one big index buffer with seperate calls to DrawIndexedPrimitive using the start index parameter within the DrawIndexedPrimitive method ? Kind regards, Steve As I get older, my mind becomes more cluttered.

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After experimenting, I can do it with one index buffer which I guess is correct ?! Only problem is, creating this index buffer for the next row, here is my code for creating the indices for one row:

  	int index = 0;	int offset = 0;	m_pIndices = new WORD[m_xDim * 6];	for(int x=0; x < m_xDim; x++) // not used yet....	{		for(int z=0; z < m_zDim; z++)		{			m_pIndices[index] = z + offset;                			m_pIndices[index+1] = z + 1 + offset;    			m_pIndices[index+2] = z + 2 + offset;			m_pIndices[index+3] = z + 3 + offset;			m_pIndices[index+4] = z + 2 + offset;			m_pIndices[index+5] = z + 1 + offset;			index += 6;			offset += 1;		}	}

I''ve hard coded a quad for the second row and the indices look like :

  	m_pIndices[index] = 1;	m_pIndices[index+1] = 8;	m_pIndices[index+2] = 3;	m_pIndices[index+3] = 9;	m_pIndices[index+4] = 3;	m_pIndices[index+5] = 8;

Need some way of programtically getting this correct, I''ve seen various ways from other people, just wondering if I was on the right track ?

Regards,
Steve

As I get older, my mind becomes more cluttered.

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