Advanced Perlin Noise strange behavior

Bug Reports
#1

Hi! I’m trying to put more detail to a DEM (SRTM) with WM. I’ve found this: http://world-machine.com/blog/?p=292 and tried to build the same (there is no information about each module’s parameters).

The problem is, that the Advanced Perlin Noise produces noise with lines with gaps instead of a uniformly distributed noise.
This only seems to happen if I put a map into the persistence guide input. It doesn’t seem to make a difference if this input map is a file or procedural…

Thanks

Tobi

#2

Hi there,

Good news and bad news:

  1. The bad news is that there is a known bug in WM 2.2 that caused the problem you describe

  2. The good news is that it was fixed early in WM 2.3 beta’s life and the fix can be downloaded here!

http://www.world-machine.com/beta/

I’ve attached the world file for that blog post here as well (sans the DEM input file which is pretty large) so you can take a look at it. You are on the right track with your world.

The file I’ve attached was made in WM 2.3 so it can ONLY be opened in the beta.

The basic idea is to:

  1. Blur the input file to remove the artifacting
  2. Select the areas where the curvature of the terrain is highest and add additional noise detail to them (You could also use other metrics like high slope areas, etc
  3. Perform erosion to add some flow details to the terrain (and also generate flow maps for texturing)
#3

Hi Stephen,

thanks for your answer! Is there a Basic Edition 2.3 beta?

#4

Unfortunately not; BUT 2.3 is completely ready except for some website-related changes. I am hoping to do a “soft rollout” for all versions onto the website in the next few days, with a more concerted effort to get the word out after that!

#5