Why are there nodraw brushs under displacements?

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Truckojr

L3: Member
Feb 23, 2019
126
67
A lot of maps in game have nodraw in and under displacements. I want to know why its there so I could use it in my own projects.
 

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aa
Jun 15, 2013
647
1,197
Displacements don't seal maps, so the nodraw brushes under them act as that sealant.
 
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Heili

L3: Member
Jul 21, 2016
114
59
I believe they meant why displacements have this z-fighting seal on the left, and the pool beneath on the right. I would like to clarify that 'They do not' in reference that maps don't use this technique was misleading when otherwise your response was correct.
displ1.JPG displ2.JPG
NihiL made an in-depth tutorial about it (12:25 talking about the nodraw):
View: https://www.youtube.com/watch?v=EfkJCEPiiOY
 
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aa
Jun 15, 2013
647
1,197
I would like to clarify that 'They do not' in reference that maps don't use this technique was misleading when otherwise your response was correct.
This was referencing a now deleted post that stated displacements did that on their own.