I’m not fully sure what “a monster on Roblox vision” means here, but the most likely interpretation is making a monster/NPC with eyesight or detection in Roblox Studio. A practical approach is to build the monster model, then add vision logic using raycasts or field-of-view checks so it can spot players when they’re in front of it and not blocked by walls.

How to set it up

  1. Create or import the monster model in Roblox Studio.
  2. Rig it so it has a proper root part and can move/animate.
  3. Add a script that checks:
    • distance to the player,
    • angle in front of the monster,
    • line of sight using a raycast.
  4. When the player is detected, switch the monster into chase mode.

Simple vision logic

A common pattern is:

  • Distance check: only scan players within a set range.
  • Angle check: only detect players inside a cone in front of the monster.
  • Raycast check: confirm nothing is blocking the view.

That matches the Roblox forum advice that line of sight needs raycasting, not just a dot-product or field-of-view test alone.

Basic example

Here’s the idea in plain English:

  • Find the nearest player.
  • Check whether they are in front of the monster.
  • Raycast from the monster’s eye or head toward the player.
  • If the ray hits the player first, the monster can “see” them.

A Roblox tutorial video also shows this workflow for making a custom monster and rigging it in Roblox Studio, which is the right foundation before adding AI vision.

Good practice

  • Use an invisible “eye” part near the head for cleaner vision checks.
  • Keep the scan loop modest so it does not lag the game.
  • Add cooldowns so the monster does not flicker between idle and chase states.
  • Test the monster in hallways, open spaces, and behind obstacles.

Short version

If your goal is a monster with vision , you want:

  • a rigged monster,
  • a detection radius,
  • a field of view,
  • and a raycast for line of sight.

TL;DR: Build the monster in Roblox Studio, then give it vision with range

  • angle + raycast detection so it can spot players only when they are actually visible.