texture noise

[Sullivan]

Hi all,
I have a problem with texture in Irrlicht.
Here a screenshot of my little demo.


How you can see the texture in the front of camera is quite good, instead the faces far of the camera are rendered with a strange noise. Also, when I move the camera around the scene, the noise effect is more marked...
For what I have saw from the tutorials images like that

the texture far away from the camera haven't this horrible effect...

Here I post a piece of my code about the map materials:

Code: Select all

 
map_model = scene->getMesh(path.c_str());
    if(!map_model)
    {
      return false;
    }
 
    map_node = scene->addMeshSceneNode(map_model);
 
    map_node->setMaterialTexture(1, device->getVideoDriver()->getTexture("./data/models/Maps/lightmap.png"));
    map_node->setMaterialType(irr::video::EMT_LIGHTMAP_M4);
    
    map_model->setMaterialFlag(irr::video::EMF_LIGHTING, true);
    map_model->setMaterialFlag(irr::video::EMF_FOG_ENABLE, false);
    map_model->setMaterialFlag(irr::video::EMF_ANISOTROPIC_FILTER, true);
    map_model->setMaterialFlag(irr::video::EMF_ANTI_ALIASING, true);
    map_model->setMaterialFlag(irr::video::EMF_TRILINEAR_FILTER, true);
 
    map_node->getMaterial(0).SpecularColor.set(255,255,255,255);
    map_node->getMaterial(0).DiffuseColor.set(255,255,255,255);
    map_node->getMaterial(0).AmbientColor.set(170,170,170,170);
 
 

Some hints?
thanks

[Radikalizm]

Are you disabling mipmapping anywhere in your code? I can't see the noise pattern all too clear in your screenshot, but disabling mipmaps can give an ugly moiré pattern on distant textures

[Sullivan]

I can't see the noise pattern all too clear in your screenshot

The noise is more visible when I move the camera, that's why could be hard see it just in a screenshot
Anyway, seems that you are in the right way. Disabling this mipmapping the result is nicer and the noise effect is less visible.
Thanks for the hint!

[Radikalizm]

I can't see the noise pattern all too clear in your screenshot

The noise is more visible when I move the camera, that's why could be hard see it just in a screenshot
Anyway, seems that you are in the right way. Disabling this mipmapping the result is nicer and the noise effect is less visible.
Thanks for the hint!

I think you misunderstood my point, it's the disabling of mipmaps which gives artifacts, you shouldn't disable mipmaps unless you have a very specific reason to do so, I was just asking if you had disabled it somewhere to see if that was the issue

Have you tried different filtering settings for your material?

[Sullivan]

Sorry, my fault!
I haven't write correctly...

I said "Disabling mipmapping...etc", but I wanted to say "Not disabling mipmapping...". Sorry

[Radikalizm]

Sorry, my fault!
I haven't write correctly...

I said "Disabling mipmapping...etc", but I wanted to say "Not disabling mipmapping...". Sorry

Ok, good to hear that it's (partially) solved then

[hendu]

Looks like AF would benefit those textures too.

[Sullivan]

Looks like AF would benefit those textures too.

Sorry don't get it. What's "AF"?

[hendu]

Anisotropic filtering.

[Sullivan]

Looks like AF would benefit those textures too.

if you mean

Code: Select all

model->setMaterialFlag(irr::video::EMF_ANISOTROPIC_FILTER, true);

Is already enabled

[Lonesome Ducky]

If it's still a problem, try changing the material's LODBias so it picks a lower detail mipmap earlier.

[Sullivan]

If it's still a problem, try changing the material's LODBias so it picks a lower detail mipmap earlier.

Do you mean this, right?

Code: Select all

 
material.TextureLayer[0].LODBias = <value>;
 

If yes, I tried it, but sadly I didn't notice a real change.
Anyway I also noticed that the noise effect is much less evident changing the model size (of course this is an expedient for the problem)

[hybrid]

Do you use b3d as mesh file format (not for the ninja, but the building). b3d stores a flag whether mipmap should be used or not. However, most editors don't set this properly. You can override this falg with a scene parameter, though, which will make the mipmaps automatically build then. Just make sure you get the mipmaps somehow. This mesh is probably not usable without mipmapping.

[Sullivan]

This mesh is probably not usable without mipmapping.

[hybrid]

Well, that's not a problem, just use mipmaps.