Clarification on my example above: the idea is to model the terrain on a lower level in this case

> So that is consistent: it always displays at elevation 0.

Exactly, I hadn't realized that before as well.

> terrain usually resides at the 0 level and the plugin is probably designed with that in mind. What do you do with a terrain floating on a higher level?

Usually yes, but there are ...

I never said I want to elevate downwards :-)

Try this:
1) Create a new SH3D file, add another level
2) Add a room at both levels
3) Create a Terrain on the upper room

You'll see that the plugin creates the terrain on the lower level. When pressing OK, it still gets put to the upper level (which is ...

Hi, thanks for this great plugin!

Is there anyone else having problems with levels below 0, where the terrain will be shown higher than it should be?

I tried to fix this in the code but miserably failed :D To me it looks like negative elevation is being ignored / set to 0.

Oops, the problem is ...

Ok... it was easier to fix than expected \o/

Patch:
diff --git a/SweetHome3D/src/com/eteks/sweethome3d/j3d/PhotoRenderer.java b/SweetHome3D/src/com/eteks/sweethome3d/j3d/PhotoRenderer.java
index c95e11a94..56ca69c87 100644
--- a/SweetHome3D/src/com/eteks/sweethome3d/j3d/PhotoRenderer.java
+++ b ...

The problem seems to be that Java3D expects Linear RGB as input color space:https://forum.jogamp.org/sRGB-and-gamma-correction-in-Java3d-td4038946.html

I've tested this by manually setting the RGB value of a wall to a gamma-corrected value ( lin=255*(val/255, 2.2) ), which makes yafaray and sunflow ...

I had a very similiar problem: when opening any properties windows for furniture, the 3D view would go blank. I fixed this by killing this 3D view refresh code:

diff --git a/SweetHome3D/src/com/eteks/sweethome3d/j3d/Component3DManager.java b/SweetHome3D/src/com/eteks/sweethome3d/j3d ...

Hi, thanks for this great plugin!

Is there anyone else having problems with levels below 0, where the terrain will be shown higher than it should be?

I tried to fix this in the code but miserably failed To me it looks like negative elevation is being ignored / set to 0.