You were able to solve this problem, I ran into exactly the same one
upd: I was able to fix it by turning on the without pdg mode, only buildings appear with it
At the moment, I have a problem that not all buildings have roofs, I tried to make the fixes listed above on the thread, but without success
upd2: still, I really wanted to fix the pdg because it takes up less resources.
As a result, I found that Building.hda does not work on houdini 19.5.435.
it does not convert the building volume to the desired points and does not change the result in any way.
as an option, I have temporarily cut off the switch in the buildings node.
I will continue to dig further, I hope I will succeed
upd #3:
I decided to fix the roofs.
I have achieved some success by adding ARBITRARY_ROOF_PCLOUD.
I modified it a bit because I didn’t have building_id for these points, now they are.
(I wrote a simple vex script that takes the neighboring building id from a certain building during the cycle)
For this you will need to modify the City_Tile_Parser_arbitrary_rooftops asset.
However, so far I have problems with the fact that the roofs are a whole big block and it affects the building.
I will investigate further
upd #5:
Apparently my previous fix worked fine and the roofs are now working well)
Before that, I tested point-by-point on old models, now I have recompiled all the models and everything works well.
Below I will attach screenshots of my changes that I made to the project.
I remind you that this works for houdini 19.5.435 because I use this version.
my fix:
