Kerbal Space Program

The Rockomax Jumbo-64 tank has several problems in 1.4.2 (see screenshots).

I posted about it here: https://forum.kerbalspaceprogram.com/index.php?/topic/173161-142-rockomax-jumbo-64-offcenter/
Which was confirmed by a couple players.

User Sam Hall provided the following assessment and download containing his suggested fixes. I tested it, it works great.

1. Opening up the .mu file in a 3d editor reveals that the orange tank is just not modeled very cleanly. Parts of it are subtly lopsided, there are split edge normals that were obviously split by accident and then just left that way, the whole thing is just a smidge off-center. No biggie, 10 minute cleanup job in Blender.

2. When they converted the diffuse map from .png to .dds the export settings were set wrong, and the alpha channel was blanked. It wasn't actually deleted; there still is a alpha channel, the image is still DXT5 not DXT1. The channel is just completely full of nothing but white. Since the shader is using the alpha channel as its diffuse map, this makes every pixel on the tank's surface completely as shiny as all hell, and makes the messed-up geometry visually pop a lot more.

2.B. Additionally, the normal map on the white tank got straight-up wrecked in the .png -> .dds conversion. It looks like they tried to use DXT5nm compression but got the swizzling process completely wrong. You're supposed to move the data from the red channel into the alpha channel and blank the blue and red channels, but instead they just duplicated the green channel over absolutely everything. That doesn't give you a working normal map.

Fortunately the .pngs in 1.4.0 are still good, so going back and re-exporting everything the right way wasn't hard.

3. the ModulePartVariants in Rockomax64.cfg was set up all wrong. What you're seeing in Klesh's screenshot is the game loading both the orange tank's mesh AND the white tank's mesh retextured with the orange skin at the same time, and since the orange tank's mesh was modeled slightly off-center the two are clipping through each other and z-fighting like crazy. This took a little longer to figure out since ModulePartVariants is documented basically nowhere but I managed to fix it by sticking both meshes inside Rockomax64.mu and deleting Rockomax64_O.mu and commenting out the MODEL line referring to it in the .cfg.

His fix download can be found here for reference:
https://www.dropbox.com/s/7cbhgyosuzwq7fc/Rockofix.zip?dl=0