Uhm, I have a problem with the shadersmod, pretty much I have it in my mods folder, only because I want the new lighting because it makes everything look nicer, I have no shaderpack on and it literally drops my fps by half, I usually play with around 500-600fps with good settings, I put the shaders mod in my folder and I can't get more then 250fps with even lower settings and lower res texture pack, please halp.
Oh, well I don't know, but why would you be running the mod without a shader pack in the first place?
If you're getting fps drops by the mod itself then wouldn't it be best to launch either without the mod or with a shader pack?
There a few options in the shaders mod that make the game look a lot nicer actually, those are the stuff I want as I rarely use shaders as my kind of play is more pvp which you dont realy use shaders in it unless you make videos, so pretty much what I want is http://prntscr.com/785rtm
I dont know how much the other options effect the quality but the ones I stated I know make the game look a lot nicer.
I don't notice anything past 1 for render resolution (but under it, I can), and the shader resolution is slightly noticeable. I don't know about cloud shadows since I don't use them, but maybe they're the reason why? Try turning the shader resolution down if you aren't using shaders. Illogical, but might be a cause.
Actually the new lighting makes the game a lot more nicer aswell and thats the thing I mostly want
The options are basically useless without a pack. The options are primarily there to actually disable some of the rendering functionality of Minecraft itself to avoid the issue of having the Minecraft effects render on top of the shader pack's effects. Anything that you're seeing is just placebo (your brain tricking you into thinking there's something going on because you believe it actually does something). The only options that actually change how the game looks would be RenderResMul, HandDepth and the old lighting. RenderResMul just changes the amount of detail within the render, HandDepth changes the depth of the hand within the scene (how far the hand clips into blocks). Old lighting disables a lighting effect that Mojang added to Minecraft. Different sides of blocks have slightly differing lighting values, this creates a pseudo directional lighting effect that makes the scene appear to have more depth by having differentiations in shading, rather than a single shade of light over the entire scene. With a shader, it is highly recommended to disable this effect, but without a shader I personally recommend to keep it on as without it the scene just looks... off.
The top image has old lighting disabled, bottom enabled. Although having it disabled makes colours appear brighter, it also kills depth and realism by having a single uniform shade of light across all sides of blocks.
The reason why it's recommended to disable with a shader pack is because shader packs perform a slightly scaled-down version of this effect anyways by way of drawing shadows on surfaces that light is not hitting. The shadows make surfaces appear dark, especially if you have SSAO enabled in the specific pack you're using, which makes the scene appear much more realistic and with a lot of depth.
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Author of the Clarity, Serenity, Sapphire & Halcyon shader packs for Minecraft: Java Edition.