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Is there any way to use more than 4 texture channels?


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#1 Veil   Members   -  Reputation: 143

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Posted 27 May 2012 - 06:57 AM

For my game's terrain I need to be able to get the terrain type under the player's feet,so it's divided into square tiles,but that turned out to look very ugly,isn't there some way to put another channel in the texture,so it's like RGBAT,where T is TerrainType.So I could just smear the textures however I want and then just check the pixel at a given location and match it's T value to the corresponding terrain type(ex;T(0) = grass,T(1) = gravel,ect.).

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#2 Nik02   Crossbones+   -  Reputation: 2520

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Posted 27 May 2012 - 07:26 AM

The easiest way is to use a second texture as a mask.

The texture formats of a given hardware have a fixed texel width (in memory), but it is possible to unpack custom data within the channels by using a purpose-built pixel shader. This is easy in D3D10-level and later hardware, since integer instructions (which are very convenient in packing/unpacking) are natively supported in SM5 and later.

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#3 JohnnyCode   Members   -  Reputation: 89

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Posted 27 May 2012 - 07:55 AM

no, but ganeral technique to achieve what you are after are vertex colors. With theese you can even blend textures to fade between eachother.

#4 ryan20fun   Members   -  Reputation: 615

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Posted 27 May 2012 - 12:49 PM

what about texture splatting( i have not tried using it yet, but beleive it could be of use to you ) ?
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Disclaimer: Each post of mine is intended as an attempt of helping and/or bringing some meaningfull insight to the topic at hand. Due to my nature, my good intentions will not always be plainly visible. I apologise in advance and assure you I mean no harm and do not intend to insult anyone.

#5 Tom KQT   Members   -  Reputation: 1344

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Posted 28 May 2012 - 01:29 AM

I don't think there is a surface type with 5 channels. But if you want to try this method then I have a question - do you really need the Alpha channel for anything? Terrain usually isn't transparent, so instead of RGBAT where T is terrain type, couldn't you use RGBA where A is terrain type?

Anyway, I would suggest something completely different, if I understand your problem correctly. The term for this approach probably is texture splatting as ryan20fun mentioned. The point is that you have for example three different tiled textures (let's say grass, dirt, sand). Then you have one special texture covering the whole terrain without tiling - this texture defines in its color channels how the tiled textures should be combined. If the color is (1, 0, 0) then only grass will be visible etc. And the huge bonus is that you can blend the textures because (0.7, 0.3, 0) will give you 70 % of grass blended with 30 % of dirt.

This will be much easier to work with and much more flexible, because in your suggested idea you have only one channel defining the terrain type, while here you have a full texture (4 channels). And also - this texture can have different texture coordinates (different tiling) than the subtextures.

Edited by Tom KQT, 28 May 2012 - 01:32 AM.


#6 Veil   Members   -  Reputation: 143

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Posted 28 May 2012 - 05:32 AM

I don't think there is a surface type with 5 channels. But if you want to try this method then I have a question - do you really need the Alpha channel for anything? Terrain usually isn't transparent, so instead of RGBAT where T is terrain type, couldn't you use RGBA where A is terrain type?

Anyway, I would suggest something completely different, if I understand your problem correctly. The term for this approach probably is texture splatting as ryan20fun mentioned. The point is that you have for example three different tiled textures (let's say grass, dirt, sand). Then you have one special texture covering the whole terrain without tiling - this texture defines in its color channels how the tiled textures should be combined. If the color is (1, 0, 0) then only grass will be visible etc. And the huge bonus is that you can blend the textures because (0.7, 0.3, 0) will give you 70 % of grass blended with 30 % of dirt.

This will be much easier to work with and much more flexible, because in your suggested idea you have only one channel defining the terrain type, while here you have a full texture (4 channels). And also - this texture can have different texture coordinates (different tiling) than the subtextures.

I don't think there is a surface type with 5 channels. But if you want to try this method then I have a question - do you really need the Alpha channel for anything? Terrain usually isn't transparent, so instead of RGBAT where T is terrain type, couldn't you use RGBA where A is terrain type?

Anyway, I would suggest something completely different, if I understand your problem correctly. The term for this approach probably is texture splatting as ryan20fun mentioned. The point is that you have for example three different tiled textures (let's say grass, dirt, sand). Then you have one special texture covering the whole terrain without tiling - this texture defines in its color channels how the tiled textures should be combined. If the color is (1, 0, 0) then only grass will be visible etc. And the huge bonus is that you can blend the textures because (0.7, 0.3, 0) will give you 70 % of grass blended with 30 % of dirt.

This will be much easier to work with and much more flexible, because in your suggested idea you have only one channel defining the terrain type, while here you have a full texture (4 channels). And also - this texture can have different texture coordinates (different tiling) than the subtextures.


Yeah,I figured it out - I'll generate 2 blendmaps(for 2xRGBA (8 terrain textures total)) on the CPU and each time a piece of the terrain is changed,I'll lock the blendmaps and change them in the cpu,then unlock again.It shoudln't cause a slowdown,since the terrain won't change more often than once every 5-10 seconds.




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