On Sun, Dec 4, 2011 at 1:08 PM, kreuzritter2000wrote:
> And Vadym Kukhtin wrote:
>> Can you use low-bit gray (or index) mask, to indicate not only placed
>> or not, but also rotate angle?  Then it will be possible to align
>> buildings along main streets.
> AFAIK Microsoft used the textures itself to put information  where to
> put an 3d object on them.
> They used a special color key, AFAIK it was white. And on all these
> white points an 3d object was placed.
> But i don't know if the use of a regular polygon grid played a role too.
> It may be possible, that the regular grid allowed a fast and easy way to
> place the objects on the textures according to the color key information
> that was in the texture.
> We could do the same, but i don't know, if this works with an irregular
> grid, flighgear uses.

This is a very interesting idea indeed. I hadn't realized that is how they had
done it in MSFS.

Rather than using the same texture, we can simply have a separate
"texture" for object type and rotation.

I've already managed to use a second texture to mask where trees are
placed. The following screenshot shows a golf course where I've used
a mask so that the random trees are only placed in the rough.


(For those interested, the golf course is Gullane, outside of Edinburgh
from some scenery I've been generating recently using gshhs for the
coastline as the CLC shapefiles)


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