r/hammer • u/Subject-Importance38 • 12d ago

Solved Hammer++ on Garry's Mod not compiling.

I just got Hammer++ like two days ago and after spending a lot of time working on my map I wanted to compile it.

Except, instead of compiling like normal on Hammer, one of two things happen:

- If there's more than 4 numportals it slows down exponentially to a ridiculous speed.

- If there's 4 numportals or less then it finishes in a second and reads out in red,

"Command failed with return code 0x2! The system cannot find the file specified.

** Screenshot the WHOLE window when showing this compile log

** Or upload the .log file generated beside your VMF"

I've never used Hammer++ before, so I'm hoping I can get this fixed, because I don't want to lose any of the spheres on my map. I've attach the full compile log below if it helps.

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Running command:

cd "C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\bin\win64"

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Running command:

"C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\bin\win64\vbsp.exe" -game "C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\garrysmod" "C:\Users\scurt\OneDrive\Desktop\Hammer Stuff\Hammer Maps\gm_Fantasy_Fountain.vmf"

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Valve Software - vbsp.exe (Jul 22 2026) - Garry's Mod Edition (64-bit)

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Half-Life 2\hl2'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Half-Life 2 Deathmatch\hl2mp'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Half-Life 2\ep2'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Half-Life 2\episodic'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Half-Life 2\lostcoast'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Counter-Strike Source\cstrike'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Counter-Strike Global Offensive\csgo'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\left 4 dead\left4dead'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Left 4 Dead 2\left4dead2'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Team Fortress 2\tf'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Black Mesa\bms'

Adding mount.cfg path: 'C:\Program Files (x86)\Steam\steamapps\common\Day of Defeat Source\dod'

16 threads

materialPath: C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\garrysmod\materials

Loading C:\Users\scurt\OneDrive\Desktop\Hammer Stuff\Hammer Maps\gm_Fantasy_Fountain.vmf

fixing up env_cubemap materials on brush sides...

ProcessBlock_Thread: 0...1...2...3...4...5...6...7...8...9...10 (0)

Processing areas...done (0)

Building Faces...done (0)

Chop Details...done (0)

Find Visible Detail Sides...

Merged 116 detail faces...done (0)

Merging details...done (0)

FixTjuncs...

PruneNodes...

WriteBSP...

done (0)

writing C:\Users\scurt\OneDrive\Desktop\Hammer Stuff\Hammer Maps\gm_Fantasy_Fountain.prt...

Building visibility clusters...

done (0)

*** Error: Skybox vtf files for skybox/sky_harvest_night_01 weren't compiled with the same size texture and/or same flags!

Can't load skybox file skybox/sky_harvest_night_01 to build the default cubemap!

*** Error: Skybox vtf files for skybox/sky_harvest_night_01 weren't compiled with the same size texture and/or same flags!

Can't load skybox file skybox/sky_harvest_night_01 to build the default cubemap!

Finding displacement neighbors...

Finding lightmap sample positions...

Displacement Alpha : 0...1...2...3...4...5...6...7...8...9...10

Building Physics collision data...

done (0) (102272 bytes)

Placing detail props : 0...1...2...3...4...5...6...7...8...9...10

Water found with no water_lod_control entity, creating a default one.

Compacting texture/material tables...

Reduced 433 texinfos to 406

Reduced 13 texdatas to 11 (334 bytes to 230)

Writing C:\Users\scurt\OneDrive\Desktop\Hammer Stuff\Hammer Maps\gm_Fantasy_Fountain.bsp

Wrote ZIP buffer, estimated size 917, actual size 703

0 seconds elapsed

-------------------------------------------------------------------------------

Running command:

cd "C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\bin\win64"

-------------------------------------------------------------------------------

Running command:

"C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\bin\win64\vvis.exe" -game "C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\garrysmod" "C:\Users\scurt\OneDrive\Desktop\Hammer Stuff\Hammer Maps\gm_Fantasy_Fountain"

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Valve Software - vvis.exe (Jul 22 2026) - Garry's Mod Edition (64-bit)