Re: [nbos] [FM] Problem with large landmasses versus smaller ones.
Christopher Rodrigues Macias
Sun Nov 30th, 2008
Hi Michael,

If I understand your issue correctly, I think I can point you in the
direction of a solution.

As I understand it (and maybe Ed can jump in if I get this wrong) the
fractal factor seems to be setting how many 'random' points will be
added to the path drawn between two manually created nodes. So, if you
have a fractal line set to a fractal factor of, say, 4, and then you
grab one of the nodes and move it far away from the other nodes, what
you'll see is the fractal line between the nodes 'stretching' out
without changing the shape of the fractal line at all. The stretched
line will seem much less detailed than it used to, but only because
the jaggies created by the fractalisation have been stretched apart as

Put another way, to get the same 'roughness' of a coastline, the key
is have roughly the same distance between the nodes you create. An
island created from 50 nodes and a continent created from 300 (both
set to the same fractal factor) will look to have exactly the same
level of fractal detail *if* the spacing between the nodes is the same
on both the continent and the island. OTOH, if you drew the island
with the nodes about 10 miles apart, but then drew the continent with
the nodes spaced about 30 miles apart, then the continent is going to
look to have only about 1/3 the level of coastal 'detail' as the island.

Does this make sense? And does it help you with the problem?


On 30/11/2008, at 12:27 PM, Thurlor wrote:

> Hi everybody,
> Recently Iíve been trying out the demo for FM8 to determine if it
> can do what I want. It would appear that it cannot, and Iím not
> sure why (it looks like it should work). What I have been
> attempting is to is use Fractal Polygons to create both large
> (continental) and small (island) landmasses. I have come across an
> issue where the fractal nature of the coastlines seems to change
> scale depending on the size of the landmass in question. For
> example Iíll create an island with say 50 nodes and it looks fine,
> then Iíll do a neighbouring continent with over 300 nodes (In the
> creation I reach a node limit so I then have to manually add nodes
> which is no big issue as such) and the coastline seems to be a lot
> less detailed even though they both have the same fractal factor.
> Is there some way to fix this or force it to work correctly?
> Thanks in Advance,
> Michael
> _______________________________________________
> Nbossoftware mailing list

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