Hi all, I am rendering some terrain using quads, the height map I have generated with PSP and loaded in as a raw file, set the y-vertices to the data in from the height map for each quad. After inspecting what I get from the height map it looks as followsnote this was for debug info) (x,y,z,diffuse color) {0,151.000000,0,D3DCOLOR_XRGB(0,255,0)}, {1,154.000000,0,D3DCOLOR_XRGB(0,255,0)}, {2,150.000000,0,D3DCOLOR_XRGB(0,255,0)}, {3,148.000000,0,D3DCOLOR_XRGB(0,255,0)}, {4,148.000000,0,D3DCOLOR_XRGB(0,255,0)}, {5,143.000000,0,D3DCOLOR_XRGB(0,255,0)}, {6,134.000000,0,D3DCOLOR_XRGB(0,255,0)}, {7,129.000000,0,D3DCOLOR_XRGB(0,255,0)}, {8,124.000000,0,D3DCOLOR_XRGB(0,255,0)}, {9,116.000000,0,D3DCOLOR_XRGB(0,255,0)}, etc.... The method I use for creating quads (storing in my vertex table): void CreateQuads() { for(int z=0; z<32; z++) // 32 is height size { for (int x=0; x<32; x++) // 32 is width { quadVertices[z][x].x = (float)x; quadVertices[z][x].z = (float)z; quadVertices[z][x].y = GetHeight(z,x); quadVertices[z][x].DiffuseColor = D3DCOLOR_XRGB (0,255,0); } } } Get height method: float GetHeight(int z, int x) { int pos = (32 * z) + x; float height = pData[pos]; return height; } pData contains the height map, now when I brute force render this it looks terrible (I am using Triangle strips). Anyone any ideas ? Kind regards, Steve

Maybe it has something to do with Triangle strips? I''ve noticed that not all of the quads are joined up ?

Any clues ?

Thanks

Your z values are all zero, you should increase your z values linearly, as you have with your x values otherwise your quads will all be rendered with the same z coordinate. This though seems a little unlikely, perhaps I''m misunderstanding the data you show that you get from the heightmap?

Thanks guys,

Mephs, the Z-values aren''t all zero (just the example data I shown is misleading), they go up linearly like you mentioned, Example :

{0,116.000000,3,D3DCOLOR_XRGB(0,255,0)}
{1,117.000000,3,D3DCOLOR_XRGB(0,255,0)}
{2,119.000000,3,D3DCOLOR_XRGB(0,255,0)}
{etc...},
{etc...},
{31,107.000000,3,D3DCOLOR_XRGB(0,255,0)}
{0,114.000000,4,D3DCOLOR_XRGB(0,255,0)}
{1,114.000000,4,D3DCOLOR_XRGB(0,255,0)}
{2,116.000000,4,D3DCOLOR_XRGB(0,255,0)}
{3,118.000000,4,D3DCOLOR_XRGB(0,255,0)}

We see here that the x-values go up linearly by one, they y-values are from the height map and z is set to 3, this will increase to 4 the next time as shown.

Thanks Ready4Dis for the colour info and scale info.

Maybe I''m rendering the data wrong ?

I create the vertex buffer as shown (1024 is 32x32):
r = g_pDevice->CreateVertexBuffer(sizeof(MYVERTEX)*1024,0,CUSTOM_MYVERTEX,D3DPOOL_DEFAULT,&g_pVB,NULL);

Then I lock the buffer:
r = g_pVB->Lock(0,1024*16,(void**)&pVertices,0);

Then copy:
CopyMemory(pVertices,&quadVertices,1024*16);

and render with DrawPrimitive:
g_pDevice->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 1020)

I''m not so sure about the 1020 I''ve put into the DrawPrimitive primitivecount parameter ?

Any more clues ?

Kindest regards,
Steve

Thanks AikonIV,

I''ll elaborate, some of the terrain looks correct while other parts of it has lines stretching across the screen, some not even connected ?

Having divided the height value it does look a little better but still some lines are stretching across the screen ?

Kind regards,
Steve

Thanks again AikonIV,

I''ll try it with Triangle lists, I''m thinking that it is the strips.
I''m also using untransformed vertices as I''m planning on later having the terrain move (I know I''ve a long way to go....quad trees etc...), guess this is correct ?

Kind regards,
Steve