Because Visible Invisibility Shaders relies on vanilla core-shader tricks rather than heavy graphical overhauls, it works through Minecraft's built-in rendering pipeline while keeping the standard vanilla look. Proper video settings ensure the game actually draws the altered particles on your screen.
Activating the Core-Shader Pack
1. Pause the game, open Options, and select Resource Packs.
2. Move Visible Invisibility Shaders from the available column on the left to the active column on the right.
3. Place it at the top of your active list so other packs do not overwrite its core-shader settings, then click Done to reload resources.
Configuring Vanilla Particle Settings
The TrueSight effect works by changing how invisibility particles render against the background. If vanilla Minecraft hides potion particles, the shader has nothing to highlight.
1. Open Options and go to Video Settings.
2. Locate the Particles button and set it to All (or Decreased on slower computers, though All gives the clearest trail).
3. Avoid setting Particles to Minimal, because vanilla Minecraft disables status-effect swirls under that setting and prevents hidden enemies from popping out.
4. If you have a shader loader such as Iris or OptiFine installed, turn off active third-party packs in the Shader Packs menu so they do not override vanilla core shaders.