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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:



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 ?


As I get older, my mind becomes more cluttered.

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