[nbos] [FM] Problem with large landmasses versus smaller ones."Thurlor" Sun Nov 30th, 2008Thanks for the reply Christopher. I am already aware that jaggedness of

fractal landmasses is determined by the distance between the nodes (actually

from what I can tell, the determining factor is the single shortest

node-node distance. Because of this feature I placed some equally spaced

dots around my coastline (background bitmap) to ensure that the node-node

spacing for both islands was the same. It still all results in the

continental landmass being a lot smoother than the islands. When I export

and image to compare the coastlines, the islands appear to have a thicker

coastline due to all the added side-to-side (perpendicular) variation. I

hope this makes sense. It's just that I'd really like to get this sorted

out.

Thanks again,

Michael

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Christopher wrote;

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

well.

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?

Cheers,

Christopher

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