Two texture layers on same polygons?

[Roland]

Programmers making art ... yeah.. I know ...

 

Anyway. I making some stone walls and had an idea of using two texture layers.

One layer that is tiled and another that is not. The tiled layer is the base diffuse color (and normal map) while the non-tiled layer would be some dirt and grime added. My idea was to get a high detail on the base color and then add some flavor to that using the second layer.

 

But how is this done? Or is it even possible to do.

 

I have seen that its possible to have two UV-maps on the models and use different textures for each of them. Is that how to do it? And if so. Can Leadwerks handle two uv-maps with different textures?

 

Have you guys any suggestions?

[Furbolg]

You meaning detail maps ? http://www.cafu.de/wiki/textures:perfect_detail_maps

 

If yes then i think its just a second textures which is blended multiplytive above the first one.

[shadmar]

You can do that in a shader using to 2 texcoords for diffuse if you do the tiling in the shader you can keep the other stretched. Simply multiply them to blend even. Maybe the existing shaders support it, haven't checked.

[Pixel Perfect]

I've seen someone do this before in Leadwerks using vertex color for the dirt

[Naughty Alien]

..something like this, should work..

 

varying vec3 lightDir,normal;

uniform sampler2D MyDifuseTexture,MyTextureOverDifuse;

 

void main()

{

vec3 ct,cf,c;

vec4 texel;

float intensity,at,af,a;

 

intensity = max(dot(lightDir,normalize(normal)),0.0);

 

cf = intensity * (gl_FrontMaterial.diffuse).rgb +

gl_FrontMaterial.ambient.rgb;

af = gl_FrontMaterial.diffuse.a;

 

texel = texture2D(MyDifuseTexture,gl_TexCoord[0].st);

 

ct = texel.rgb;

at = texel.a;

 

c = cf * ct;

a = af * at;

 

float coef = smoothstep(1.0,0.2,intensity);

c += coef * vec3(texture2D(MyTextureOverDifuse,gl_TexCoord[0].st));

 

gl_FragColor = vec4(c, a);

}

[Roland]

You guys are just so awesome

 

Can't wait until I get home a test

[Roland]

You meaning detail maps ? http://www.cafu.de/w...ect_detail_maps

 

If yes then i think its just a second textures which is blended multiplytive above the first one.

Not quite. Grrrr .. my lack of English. Let's illustrate then

 

Lets say I have this tile (256x256)

 

 

and an oyerlay (512x512)

 

 

Then I want to add the tile to plane (tile 4 times = 512x512)

and the place the overlay on the same plane, like this

 

 

or without the red tile markers

 

 

and of course I want to place the overlay in code (or bye mat-file) so I can use different overlays.

[shadmar]

You can do this with 2 uv sets..

UV1 has 4 tiles UV2 has 1 tile...

 

..and a small shader change (2-3 lines or so in the mesh.frag)

 

[shadmar]

shader change for this test was :

 

Before main() add

 

uniform sampler2D texture8;

 

Find

 

diffuse *= texture2D(LW_DIFFUSE,texcoord0);//*fOcclusionShadow

 

Add below this line :

 

diffuse *= texture2D(texture8,texcoord1); //texcoord1 reads UV channel 2

 

or use + to add it on top, use black as background.

 

Add texture8= to your mat file and use any diffuse shader.

 

Might be useful to use glsl preprocessor directives so it doesn't apply to everything.

Just create a mesh_diffuse_whateverelse_2uvmaps.frag and use

 

#declare dualUV 1

 

Then in mesh.frag test if this is true and apply the example above.

This way you can apply 2 UV sets using any shader, bump specular, glow or what not.

 

good luck

Let me know if it works or just ask,

[Roland]

@Shadmar

 

I'm probably doing something wrong.

With those changes my MaterialEditor and Editor crashes.

 

I have attached my files.

 

 

[shadmar]

@Shadmar

 

I'm probably doing something wrong.

With those changes my MaterialEditor and Editor crashes.

 

I have attached my files.

 

 

 

Ah..

 

You missed the directive around

diffuse *= texture2D(texture8,texcoord1); //texcoord1 reads UV channel 2

 

And #declare should be #define.

And The diffuse should also go in the 2uv.frag file

#define LW_DIFFUSE texture0

 

Looks good! This is what I got :

 

Here are the shader files fixed :

frags.zip

[Roland]

Wow. Thanks thanks thanks. Shadmar

Now I can get good details using tiles and at the same get dirt there with good resolution.

 

That was really kind of you to take the time for this. Much appreciated.

Hope this of some usage for others also

[shadmar]

Don't worry, I'm having fun doing shaderstuff