Ensure you have OptiFine or Iris installed for your specific version of Minecraft.
The blocky shadows smoothed out, casting a gentle glow across the grass. file name sflpshadersliteallversionszip
While the acronym SFLP isn't a mainstream industry standard (suggesting it may belong to a specific modding community, a GitHub repository, or a private render engine), the naming convention tells us a clear story: Ensure you have OptiFine or Iris installed for