Bug: Combining $detail and $bumpmap renders incorrectly

[lodyb]

Describe the bug

A texture like this that combines a bump map with a detail renders like this

Left is the above texture and right is without $detail (looks correct)

I have looked at this in the Valve docs and it mentions for CSGO:

https://developer.valvesoftware.com/wiki/$detail

I am using mode 10 which I thought would work

Tested in Momentum 0.9.38 so far, this works fine in CS:S (But I understand this may be a CS:GO engine issue)

To Reproduce

• Make a texture with a bump map + a detail (any $detailblendmode it seems)

• Compile map, build cubemaps

• Checkerboard appears on the texture instead of the $detail texture

Issue Map

material_map_detail.zip

Map has the issue texture packed, and the non issue texture next to it for reference

In hammer++ looks fine

In CS:S looks fine

Expected Behavior

It should be the albedo texture + bumpmap + detail together

Operating System

No response

[lodyb]

I have since tried this with different materials, and it has worked.

I suspect I was using a broken texture or something,

LightmappedGeneric
{
	"$basetexture" "cammie/wall/sandstone01"
	"$bumpmap" "lody/s3/s3_normal"

	"$detail"  "custom_textures/marble_tile"
	"$detailscale" 1
	"$detailblendmode" 3

	"$ssbump" 1

	"$envmap" "env_cubemap"
	"$envmaptint" "[0.04 0.04 0.04]"

	"$color2" "[0.93 0.93 0.93]"
}

My new texture works fine. There's a chance that there's something up with the combination of materials and vmt in the source post but I think this issue is misleading.