#rtgi faq

I recently resubscribed to Marty’s shaders and noticed that RTGI is now split into two separate shaders. However, when I try increasing the Object Thickness value in the diffuse shader, objects lit by the light source start to show harsh, jagged edges (pic 2), even when the value isn’t set very high. This didn’t happen when I was using the older version of RTGI (pic 1).

Also, I just want to say thank you sooooo much for everything you share with the community. I’ve watched a lot of your tutorials, and they’ve been incredibly helpful for someone like me who didn’t know anything about ReShade!!

Hi!

Hi, anon.

No. Marty's Pro and Ultimate shaders are premium quality, and so he requires a patreon sub to access them. I've seen the work that goes into creating them. He's a skilled programmer, he researches professional papers on shader methods, and creates his own cutting edge solutions.

Hi anon!

I struggle with getting the right settings all the time.

I don't know if you've seen my most recent preset, Summer Dream, but I set up RTGI (2 versions, the most recent and also an older version from before Marty rewrote it) with settings I think work pretty decently. But I still find myself tweaking it from time to time, because light levels vary so dramatically in TS4. And also because I'm still very new to the shader and kind of don't know what I'm doing lol

Grab Summer Dream, scroll down a little in the shader list and activate RTGI and take a look at the settings. If you like how they look, transfer them to your current preset.

RTGI just got a big update and was wondering if you've tested it out in the sims 4? I want to know if it's working fine before resubscribing to get the update 😅

I haven't tested it in TS4 yet, but I've been using it for a few days in other games and it's working just fine. I can't see any reason why it wouldn't in TS4! Make sure you have the latest ReShade version, which is recently out too, and contains some fixes for a few bugs that had been floating around for a while. There's a big performance improvement now RTGI is split into 2 separate shaders. Now you have the main 'diffuse' controls, which are Ambient Occlusion and Global Illumination, in one shader, and the 'specular' settings for reflections in another. If, like me, you tend to use the diffuse effects more than the specular it speeds things up quite a bit.

Hi anon. I'm really glad you're enjoying BG3, it's a really great game and fully deserving of all the awards and praise it's been getting!

I'm afraid I'm a novice myself at using RTGI. I tweak settings all the time because what seems to work in one place ends up looking weird somewhere else.

Ray length is important, the higher the better. The two settings below that confuse the heck out of me, and I move them around all the time. Those two will have the biggest impact on performance, so they'll be where you may need to compromise.

AO intensity and Bounce Light intensity are the shadows and reflected light that make up the main bulk of why you're using the shader in the first place. Don't set them too high, you want something that looks quite natural. Or disregard that altogether and set them high for something really dramatic! I tend to use more exaggerated settings in TS4 because it's a stylised game and I'm not aiming for perfect realism. The more realistic the game the more subtle you want to be with RTGI ime.

You probably want convert to SGR ticked, but I go backwards and forwards on that so idk, whatever you think is best.

I'm not sure I'll ever get a proper handle on it, and I'm fighting ancient hardware so I can't go all out with the best settings anyway.