Shaders as a technology are instructions for a video card that describe everything related to lighting in games: the play of light and shadow, glare, even just changing the brightness of textures from a light source. In Minecraft, they are also there, but primitive. If you put third-party, the graphics improves many times. Minecraft 1.15.2 Shaders improve water, shadows and light, reflections, add textures for clouds and sun rays. However, shaders use a lot of video card resources; weak Minecraft client systems with shaders may simply not pull or lose a lot of FPS.
How to install shaders without Forge:
Download the OptiFine 1.15.2 .jar file
Run it using Java. If it doesn’t work, try opening the OS shell:
terminal for Linux and Mac OS,
command line or PowerShell for Windows.
Then enter the command java -jar<name of the .jar file>.
3. The installer should open. If you changed the Minecraft installation folder, change the path in the Folder field and click Install. If everything is by default, just click Install. The version you put OptiFine on should already be installed through the game launcher.
4. If everything goes right, a ready-made profile with the necessary version of OptiFine will appear in the launcher.
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