Add shade of gray to building facades

[sensescape]

@bcamper @patriciogonzalezvivo @nvkelso

Now that I'm using a texture, not sure how to add a slight shade of gray to the building facades.

Shader here:
https://github.com/tangrams/refill-style/blob/gh-pages/refill-style.yaml#L824-L838

But I'd like to be able to tweak the facade color in the buildings layer
https://github.com/tangrams/refill-style/blob/gh-pages/refill-style.yaml#L2402

[patriciogonzalezvivo]

Take a look to line 17 from here: http://tangrams.github.io/tangram-play/?scene=https://rawgit.com/tangrams/tangram-sandbox/gh-pages/styles/default.yaml#17.299999999999997/40.71666/-74.00843

color.rgb *= vec3(min((worldPosition().z*.001 + .5),1.));

[bcamper]

Better to use the technique from Eraser Map, since we tint texture
buildings there. I actually removed that piece earlier today when I ported
the EM code to here :)

On Fri, Feb 26, 2016 at 4:50 PM, Patricio Gonzalez Vivo <
notifications@github.com> wrote:

Take a look to line 17 from here:
http://tangrams.github.io/tangram-play/?scene=https://rawgit.com/tangrams/tangram-sandbox/gh-pages/styles/default.yaml#17.299999999999997/40.71666/-74.00843

color.rgb = vec3(min((worldPosition().z.001 + .5),1.));

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#18 (comment)
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[bcamper]

I think we can start with this from EM, and optimize once we see what our needs for Refill are:

https://github.com/tangrams/eraser-map/blob/gh-pages/eraser-map.yaml#L681-L707

[sensescape]

Thanks! Much better. Some were so faded they were disappearing. See below:

Before:

After: