Various issues with shaders
I'm using the SEUS PTGI E9 ray tracing shader pack but the colors don't work when I use that pack:

Without the shaderpack it works:

I'm guessing this must be an issue with every shaderpack? I want to be able to use the shaderpack though while also using WorldEdit CUI. Just not sure if this is something that the shaderpack needs to fix or if it's something WorldEdit CUI needs to account for.
Can you also try other shaderpacks? I think it's very likely because how WECUI is drawing the lines, but I would like to know if this indeed happens with all of them.
Yeah it seems to affect any shaderpack that I use
Can you also reproduce this with 1.12.2 WorldEditCUI? Just to rule out that my fork isn't the culprit.
I believe WE CUI and shaders never played nice, ever. I've used this mod since when LiteLoader was new and shaders weren't in optifine and while it's usable the colors never worked right, on any version I've personally used. Maybe you can somehow incorporate the line drawing into fabrics / optifines rendering pipeline instead of using OpenGL directly? I'm not too big on graphics programming, so no idea if that would help, but it's an idea.
I haven't done any (proper) graphics programming either, but if there's indeed a better way available then someone could make a PR.
---- On Tue, 12 Nov 2019 15:41:40 +0000 [email protected] wrote ----
I believe WE CUI and shaders never played nice, ever. I've used this mod since when LiteLoader was new and shaders weren't in optifine and while it's usable the colors never worked right, on any version I've personally used. Maybe you can somehow incorporate the line drawing into fabrics / optifines rendering pipeline instead of using OpenGL directly? I'm not too big on graphics programming, so no idea if that would help, but it's an idea.
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May be a good opportunity to learn something new - I'll take a look into it
I have the similar problem. It works in 1.14.4, but when I moving to 1.15.2, the frame DONT show up in any shaderpack(BSL and Sildurs).
I use fabric and here is my problem mod list:
The same mods I used in 1.14.4 including CUI1.14.4_3 really WORK.

I've made some progress on this issue. There are still issues with drawing selections over skies and waters which I hope to make progress on, but once my work is tidied up even what I have so far will be an improvement.
Thanks works like a charms with the one I use :)

i'm using forge and seus shaders pack
but my lines dot get colors keeps all black
anyone know a fix for it ?

WorldEditCUI is not available for Forge (at least not in a form anyone here supports or can recommend)
I didn't feel opening a new issue for this made sense, given it's already labelled and ongoing.
Not having any issues with actual worldedit selections, they display correctly as far as I can tell. But Griefdefender claim visualizations and WECUI's Chunk Borders are problematic.
GriefDefender claim visualizations are pretty opaque.

Chunk Borders turned on via the WECUI key make the entire screen opaque, not just the borders

I'm using the following mods for Fabric 0.13.1 on 1.18.1 (Left out mods that have no relevance to rendering at all, have seen the issue on a test setup without them)
Fabric API 0.46.4 Indium 1.0.2a2 Iris 1.2.0 Sodium 0.4.0a6 Starlight 1.0.0
With the shader pack Complementary Shaders 4.3.3
I have seen the same results with a few other shaders such as BSL and Seus.