Hi I have a problem : all my markers pass through the textures: walls, vehicles, etc …
Screnn :
https://img15.hostingpics.net/pics/431309bug1.png
merci 
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try to set alpha to 255
Apparently this is not a script the problem but my fivem. The players on my server see the markers normally. Thanks anyway.
Remove 1 at position z and your marker will touch the ground 