I have an area that I need to preserve where I am using a mask to do it. Outside of the mask I am using erosion. Which works fine when the outside part goes down from the masked area, but when the area outside the mask is higher I get some ugly ditches at the masks edge.
From side view
Mask | Erosion
What I am getting:
/
/
====| /
| / <-- Ditch Effect. 
V
What I want:
/
/
/
===|=
What is the best way to apply erosion with masks to avoid the ditching effect?
Thanks
Hi there,
I know exactly the problem you’re talking about.
If you’re using the currently available Development edition of World Machine, I would use the Height Matching Chooser to fix this. The Height Matching mode ensures that the transition around the mask doesn’t exhibit this ditch effect.
Essentially, you’d wire up as the first two inputs to the chooser your terrain, then your terrain effected by erosion. Wire your mask into the third input – don’t connect the mask to the basic mask input on the erosion device.
Then in the Chooser, change the mode from “Alpha Blend” (which will produce exactly the same result as your current attempt), to “Height Matching”. The ditches should disappear. To make sure that your masked area stays at exactly the same height, slide “Favor elevations from” all the way to the left, which will make the resulting heights be accurate to the first input instead of a blend of them.
Looks like I need to get the Development release… I do not have the Height Matching Chooser. Thanks I will give it a shot when I get latest.
Is there another way to get around this? Having a hard time getting a reply from World Machine about getting on a Development build.
mrapelje, are you using the free version of WM or a licensed version? If you have a license, you can download the development version from the same place (“upgrade center” on WM home page) you download the licensed version.
Lic issue is resolved. The height chooser works great! Thanks!!
