Terrain Texturing Shader

[SpiderPig]

I'm looking for someone to write a terrain shader that will texture a terrain model based on height and slope.

 

I want it to use uniforms for the height and slope of each layer so I can change them through code.

It will need to use at least four layers - each with diffuse, normal and specular maps. If it can use more layers that would be better.

Also I would like the option to use an alpha map to further control where textures are shown.

 

The terrain is a cube, pictured below;

 

 

Would like it by the end of the month if possible.

Will pay for the work too. PM me if interested.

[shadmar]

Not sure you can allocate 13 channels? (4 diffuse, 4 normal, 4 specular + 1 for alpha), can't test right now.

Might work if you pack specular into the alpha channel of the normal texture, then you would need only 9. (4 color, 4 normal with specular as alpha) + one mask alpha.

[Josh]

OpenGL 4.0 supports 16 texture units (minimum).

[shadmar]

this is a 4 texture splat shader no normals form LE3 before terrains:

[shadmar]

float slope = 1.0-ex_normal.y;
vec4 g1=texture(texture0,ex_texcoords0*42);
vec4 g2=texture(texture1,ex_texcoords0*42);
vec4 g3=texture(texture2,ex_texcoords0*42);
vec4 g4=texture(texture3,ex_texcoords0*42);
vec4 g1full=texture(texture0,ex_texcoords0);
vec4 g2full=texture(texture1,ex_texcoords0);
vec4 g3full=texture(texture2,ex_texcoords0);
vec4 g4full=texture(texture3,ex_texcoords0);
g1=mix(g1,g1full,0.2);
g2=mix(g2,g2full,0.2);
g3=mix(g3,g3full,0.2);
g4=mix(g4,g4full,0.2);
outcolor = g1;
outcolor = mix(outcolor,g2,smoothstep(0.0,0.05,slope));
outcolor = mix(outcolor,g3,smoothstep(0.01,0.125,slope));
outcolor = mix(outcolor,g4,smoothstep(0.125,0.26,slope));

[SpiderPig]

Thanks Shadmar, the code helps a lot. I'm still looking for someone who can do it for me. I've posted the job on UpWork too.

 

https://www.upwork.com/ab/applicants/866045947490144256/job-details

[nick.ace]

I'm not sure if you got anyone to work on this, but I would suggest replacing one of Leadwerks texture unit bindings with your own bindings. This way you can support texture arrays, which allow you to have 256+ textures for a single texture unit. This way, you also get sampling modes and mipmapping to work correctly (which can't get with a texture atlas).

[SpiderPig]

I have the shader now and am making it work with Leadwerks at the moment.  What texture bindings are you referring to?  More textures would be good.

[nick.ace]

Leadwerks allows up to 16 (1-layer) textures to be bound to a material. You can bind your own OpenGL texture array to one of these units, giving you at least 256 texture (I think that's the minimum in the specification). They all must be the same resolution, have the the same number of mipmap levels, and be the same format though.

[SpiderPig]

Ahh thanks.  I'll check it out.