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Using MipMaps

Started by spong3bob Aug 29, 2008 at 6:44 PM 1 reply 650+ views

Original Post

Aug 29, 2008 at 6:44 PM

Hi! i want to use mipmaps for my terrain, but i think i always forget something as thex dont work.. D3DXCreateTextureFromFileEx( renderer->Device, Dateiname, D3DX_DEFAULT, D3DX_DEFAULT, levels, 0, D3DFMT_UNKNOWN, Pool, D3DX_FILTER_POINT, D3DX_FILTER_POINT, 0, NULL, NULL, &t); Thats the way im loading my texture (a 1024x1024 grayscale png used as a heightmap) levels usually is 4 und the pool is Managed. then im using the texture in my vertex shader: float zf_zd = tex2Dlod(ElevationSampler, float4(uv, 0, CurLevel)); But it just doesnt user the level i want it to use... (always level0 i think) did i do something wrong, or did i forget to do something (before i draw my primives i just set the texture and set the values of the constant tables)

Namethatnobodyelsetook

118

Namethatnobodyelsetook

Aug 29, 2008 at 8:34 PM

If you do just a tex2D it will automatically use (and blend between) mipmaps for optimal speed and quality. Ensure you setup a mipfilter in your sampler states, usually set to linear.

spong3bob

Author

spong3bob

Aug 30, 2008 at 6:30 AM

i dont want it automatically because i got several levels in my terrain rendering algo, and to avoid that the terrain heights always switch (the result is a waveing animtion while moving) i want to use another mipmap-level in each level.

I now got it like that:

Device->SetSamplerState(0, D3DSAMP_MIPFILTER, D3DTEXF_LINEAR); //(also tried it with POINT)
Device->SetTexture(D3DVERTEXTEXTURESAMPLER0,heightmapTextur);

but it still doesnt work..

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