There are multiple ways to fix this. Here is one of them:
Let H be your heightfield an D the details that you added.
What you did is this: A = D-H You get the details/structures that were added by erosion. Values below 0 will be clipped, but... You can also do it the other way round B = H-D in which case you get the details/structures that were subtracted by erosion. Create a new map with a height of 50%. Let's call this map G. And do the following. Final result F = G - B + A
Now all you have to do is teach your 3D program to interpret 50% as 0.
The resolution dependencies aren't caused by seed values. You're simply getting problems when the output of a device relies heavily on features in the input that only exist in the hi-res version. Devices that work with high frequencies, derivatives or other small details are particularly affected. Erosion for example is somewhat chaotic, butterfly effect-ish.
What security verifications? The windows accout control stuff? I believe you can minimize them by setting your paths (those for macros etc) to a place that isn't "C:/Programs". If that doesn't help, maybe try to run the whole program as administrator (right click > run as admin)?
Personally, I'm running Windows Seven and don't get any notifications at all.
Tmd files are world machine files that you have to open with world machine.
No, it's not. The macro was made for the free edition which lacked the curves device. This is no longer the case, the curves device exists in all versions of WM and is a much faster tool than the macro was.
World Machine is a tool for creating terrains - you will have to do the rest of the 3D stuff in a real 3D program.
But the part about generating the terrain looks feasible :) (except realistic rivers) WM can export maps as Wavefront Objects (obj) so you can easily use the generated terrain in the 3D package of your choice (TG2 is a relatively cheap landscape renderer but animations are tricky). You can also generate maps at different resolutions for LOD purposes.
I suggest you download the free version and just give it a try! It doesn't have some of the features of the commercial version but will show you what WM can and can't do.
Just generate mountains and hills in separate generators and combine them? You'll probably want to use a mask to restrict the addition of hills to the valleys and maybe blur the valleys before combining.
1. Sounds like a memory leak. (2.) If this is the case, you can't really do anything about it. 3. I don't think so - it's a software error. Also, the next version will have more sophisticated memory management that makes larger builds possible without buying better hardware.
For now, save before using Layout Mode and kill WM via the taskmanager. This is faster than waiting.
edit: I can confirm this and will write a bug report.
I guess the main problem is the poles*. For now, it's probably be best to 0. Set the map extents properly (such maps are in a 2 by 1 format [306°x180°]) 1. Make the map seamless in both directions, see this thread: http://forum.world-machine.com/index.php?topic=1159.0 2. Motion-blur the poles and maybe apply a little regular. You'll have to try and see how much motion blur works well. ... I think this could work.
*Someone should remove this amiguity from the english language