Fixed SI debug display highly misleading with vertical weight [6051]

Mode: Creative (should be the same in others though)
Mode: SP

SERVER NAME: NA
SEED-ID: NA

MODIFIED PLAYFIELDS: No

Reproducibility: Always
Severity: Minor

Type: SI Debug Display

Summary: SI debug display highly misleading with vertical weight

Description: The SI debug display doesn't correctly show the amount of stress when weight is added vertically. In more complex situations this could surprise someone when they place a block and something collapses.

Steps to Reproduce: Create the shape shown in the following image.


(These are plain concrete blocks.)

This arm is one block away from collapsing, but it is still green. It should be dark red. Adding one block to the top causes the whole arm to collapse.

In this simple example it's kind of obvious that it will probably collapse, but in more complex situations a player may think they are safe only for a structure to collapse when a block is placed.

Here's a less obvious example where something is about to collapse but SI debug says otherwise:

 

On a related note....

I don't know if this is a bug per se or more of a major gap in the SI model but:



Basically it's impossible to support anything with suspension.

Guess I won't be making any suspension bridges or enclosed football stadiums any time soon.

 

I placed the truss blocks in that image by selecting a region then using the "fill" command of the N build menu. So it collapses immediately.

(The type of blocks doesn't matter.)

if I disable SI then I get this:



but notice that there seems to be another bug here too. When I spawn my SI test base again, the whole thing is green. It should be getting more red toward the center.

If I select the whole roof and flood fill it again, then it goes back to being shaded the way it should be:



With that fixed, here's what it looks like with the tall joist added on top and SI disabled:



I guess it didn't shade the blocks properly with SI disabled. When it enabled it looks like this:



Let me try to get a screenshot right as it collapses just in case that helps any:



Here's the test base BP in case it's useful:

https://steamcommunity.com/sharedfiles/filedetails/?id=1645416908

(I made the foundation thicker so it can more easily be spawned firmly embedded in uneven terrain.)

 

Two more tests in case it's helpful:

Here I didn't use flood fill, I turned SI OFF and then used control drag to place this. Same thing



I removed that then turned SI ON and placed as much as I could with control-drag:


Pretty much the same thing. Doesn't seem to matter if I used flood fill or ctrl-drag (though that last one I couldn't get to go all the way across because of the limit on ctrl-drag)

Another possibly interesting test case:

I can build a colum all the way up to the grid limit and it won't collapse.


Anything placed on the side of the column will collapse.

One more:


Anything placed on the edge of that diamond shape at the top collapses. The coloring is interesting as the center block seems more green than the column itself.

 

Fixed in A10 EXP. Please Try it out​