Texture Seam Prob w/ Wiki Terrain Shader

Hey-

I am using the HLSL multi-texturing shader from the wiki but I've run into a problem that I can't figure out. There are visible "seams" in the texture where the terrains meet up. I'm not using any other code on the terrain... not stitching or anything like that. Here is a shot of what I am talking about:



All of the textures used tile seamlessly so I have no clue why this is happening. The scale I used in this shot is 10 but I've tried everyting. Anyone have any thoughts?

-Jeff

You're stuck. My knowledge is that this has to do with magnifactation filtering. Now you could try to lessen it by using the Clamp operation instead of wrap. But that probably will not eliminate it.

The edges are looking to filter/blend themselves with their nearest neighbors. However, these neighbors are on another map in this case. Near, but yet soooo far away.

Good luck.

Man first ent_fixnormals and now this... you just like to ruin my day don't you . I'll try it with clamp but I think that I've already been down that road before. Once again, thanks for the info.

-Jeff

Cover it up with some shrubs

Well.. or you could cover it up with dirt sprites that blend to the terrain with an alpha map, if you want to be a little more creative.

As for the actual shader problem... I ran into the same issue with the exact same effect. I'm currently experimenting, but if I come up with a fix I'll be sure to let you know.

The picture shows where two terrains meet up that are using the same multitexturing shader?

if it is really a tilable texture then you should be able to solve it by choosing the right scaling-factor. thats some fine tuning by testing or calculating..

aha! Ello you made me realize something...

Look at the two terrains closely... it looks like the one on the left is scaled bigger than the right ... I have no idea why it would do this, but it's what it looks like....

-Rhuarc

The textures do tile perfectly any other time... just not when on the terrain. Both hmp use the same action so they use the same scale factor... 10. So there is a magic number here that works? That can't be how its supposed to work is it?

Try a power of two, like 8 or 16... does it still do it then?

-Rhuarc

Yeah power of two doesn't help. I've tried almost every number here. I wouldn't think that this was how this was designed to work. It would seem that it should work with any scale factor but it just doesn't.

Is it possible that the UV coords of the HMP format are just screwy? I noticed that this is a problem even without shaders. I then made a model out of two polygons, planar mapped it with the same texture, lined up bunch of them up in wed and the textures tiled perfectly.

actually ello is correct i have done alot of terrain work it has to do with the size of the terrain versus the scale factore of the texture
easy way to fix make sure when building you terrain that u use either 33 or 65 verts in both directions with 16 or 32 or 64 triangle size then write down how many time u scaled it up in wed say 10for example so example(65 verts 64 triangle size is a terrain size of 4096 quants scale up by 10 = 40960 quants
so texture scale factor say u want 1 texture for each 512 quants=40960/512=80
like i said easy fix just do the math

Makes sence but then again I've never been that adept at that new fangled mathmatics. It does work as you said but the vertex/triangle size doesn't have to be resticted. Any setting appears to work as long as you figure it out like you said. Thanks for the input and answers. Very helpfull.

yes but it is eaiser to move then around and line them up in wed doing is simillar to how i sugested