mip map distance

Pr3t3nd3r · Post by **Pr3t3nd3r** » Tue Sep 20, 2005 4:05 pm

cand anyone give me some sugestions how i cand cange the distance at what the mip maps are generated and used ?

Pr3t3nd3r · Post by **Pr3t3nd3r** » Fri Sep 23, 2005 11:24 am

OK OK. please. not all in the same time.

The answer (basically this seems to be the universal answer i get ...) is it is impossible.
Mip map are used when they are need'it and that' id you can't change that.

The problem is that mip maps gets blurred. And very small texture 32/32 and lower are so blurred that them are containing much useful information...

An way to get better textures (non blurred) will be an bether algorithm for:

copy32BitMipMap
copy16BitMipMap ...

Spintz · Post by **Spintz** » Fri Sep 23, 2005 11:37 am

After a quick 2 second search through DirectX 9 Help File

http://msdn.microsoft.com/library/defau ... exture.asp

Notice the 3rd parameter, specifying the # of mip map levels for this texture.

Quick search through Irrlicht code for CreateTexture in DX9 code revealed -

Code: Select all

	hr = Device->CreateTexture(
		TextureSize.Width,
		TextureSize.Height,
		1, // mip map level count, we don't want mipmaps here
		D3DUSAGE_RENDERTARGET,
		d3DFormat,
		D3DPOOL_DEFAULT,
		&Texture,
		NULL);

and

Code: Select all

	hr = Device->CreateTexture(optSize.Width, optSize.Height,
		mipmaps ? 0 : 1, // number of mipmaplevels (0 = automatic all)
		usage, // usage
		format, D3DPOOL_MANAGED , &Texture, NULL);

and

Code: Select all

		hr = Device->CreateTexture(optSize.Width, optSize.Height,
			(flags & ETCF_CREATE_MIP_MAPS) ? 0 : 1, // number of mipmaplevels (0 = automatic all)
			0, D3DFMT_A1R5G5B5, D3DPOOL_MANAGED, &Texture, NULL);

Seems this is used, because of some bug when linking in DX8

D3DXFilterTexture

The engine would need some modifications, but it's more than possible.

Pr3t3nd3r_guest · Post by **Pr3t3nd3r_guest** » Fri Sep 23, 2005 2:41 pm

Is used 1 because it use
copy32BitMipMap
copy16BitMipMap

I don't know if using the automatic generated textures generated by direct x will get better quality ... (i think they use the same algorithm ...)

... a possibility to manually add all mip maps will be cool too ...

Pr3t3nd3r_guest · Post by **Pr3t3nd3r_guest** » Fri Sep 23, 2005 2:45 pm

an other think i love to test if is possble is to disable textures from 32/32 and lower resolution (and to use for them 64/64) ...

puh · Post by **puh** » Sat Sep 24, 2005 9:12 am

Tip: try to comment the line #define _IRR_COMPILE_WITH_DIRECTX_8_ in file IrrCompileConfig.h and recompile Irrlicht. You will notice that mip-map levels will have much more quality... But DirectX8 will be disabled...