Re: [Flightgear-devel] Shaders and textures

[HB-GRAL <fli...@sa...>]

Vivian Meazza schrieb:
> 
> The grey patches are not snow - they denote steep areas; perhaps rock, or a
> rock run. They are generated in crop.frag by:
> 
> 	//"steep = gray"
> 	c1 = mix(vec4(n-0.42, n-0.44, n-0.51, 1.0), c1, smoothstep(0.970,
> 0.990, abs(normalize(Normal).z)+nvL[2]*1.3));
> 	//"snow"
> 	c1 = mix(c1, clamp(n+nvL[2]*4.1+vec4(0.1, 0.1, nvL[2]*2.2, 1.0),
> 0.7, 1.0), smoothstep(snowlevel+300.0, snowlevel+360.0,
> (rawpos.z)+nvL[1]*3000.0));
> 
> not a bug but a feature :-)
> 
> Vivian
> 
> p.s. not my code btw
> 

Is it possible to add (or blend) a texture in the shaders to steep= gray 
instead of calculating a 'simple colour cloud'? In combination with a 
texture it probably looks like all the 'perhaps' and is a very nice feature.

Here recent 'steep = gray'-blobs do not look like rock or rock run or 
something else at the moment - sorry for my misunderstanding.

I see that some landmass reliefs are calculated also with snow. So it 
should be possible to add a texture to the 'steep=grays' or not?

Thanks- Yves