Roblox 3D and pet simulator glossary

Reducing a mesh's triangle count while keeping its shape, for example with Blender's Decimate modifier. AI generators often return more triangles than a Roblox pet needs, so the mesh is decimated to the triangle budget before export.

Triangle and texture limits

Common 3D file formats. Roblox Studio's 3D Importer reads FBX, glTF/GLB and OBJ. FBX is the usual choice for rigged and animated models; GLB packs mesh, PBR textures and animation into one file; OBJ carries only the mesh and basic textures.

Import a 3D model into Roblox Studio

AI generation that turns a picture (a sketch, concept art or a render) into a textured 3D model; text-to-3D does the same from a written prompt. Image-to-3D gives more control over the look, which helps keep a set of pets in one style.

How to make a Roblox pet with AIRoblox pet generatorRoblox 3D model generator

Drawing simpler versions of a mesh when it is far from the camera. Roblox does this itself for MeshParts whose RenderFidelity is Automatic, so you don't upload separate LOD meshes; you only keep the base mesh light.

Triangle and texture limits

One image that holds the colors for a whole model. A Roblox mesh object takes only one material, so a pet should arrive with all its parts on a single atlas. Proppo merges materials and caps textures at 512 px for pets, eggs and items and 1024 px for props.

Triangle and texture limits

Transferring surface information into a texture image: for example, detail from a high-poly mesh into a normal map for a low-poly one, or several materials into one atlas. Baking lets a light mesh keep the look of a heavy one.

Triangle and texture limits

The most triangles you allow one asset. Roblox caps a single mesh at 20,000 triangles, but pet games stay far below that because dozens of pets render at once, often on phones. Proppo's presets are 4,000 for a pet (2,000 on the mobile preset), 1,500 for an egg, 3,000 for an item and 6,000 for a prop.

Triangle and texture limitsRoblox pet generator

The flat 2D layout that tells the renderer which part of a texture lands on which part of the mesh. Roblox's texture specs ask for a single UV set per mesh with all UVs inside the 0–1 space; overlapping UVs are allowed.

Import a 3D model into Roblox Studio

A MeshPart property that sets the shape used for physics: Default, Hull, Box, PreciseConvexDecomposition or Tunable. Pets that follow a player rarely need precise collisions, so Box or Hull (or CanCollide off) keeps physics cheap.

Triangle and texture limits

The invisible root part of a Roblox character that the Humanoid moves. Pet follow scripts read its position to keep a pet next to or behind the player.

How to animate a Roblox pet

A Roblox part that renders a custom 3D mesh imported from a file. Each MeshPart has one material and up to 20,000 triangles, and it can hold a SurfaceAppearance for PBR textures.

Import a 3D model into Roblox Studio

Which machine simulates an unanchored part's physics: the server or one player's client. BasePart:SetNetworkOwner(player) hands it to that player, which makes their own pet move smoothly; SetNetworkOwner(nil) keeps it on the server. Anchored parts have no network owner.

How to animate a Roblox pet

The point a part or model moves and rotates around (PivotTo, Model.WorldPivot, BasePart.PivotOffset). A pivot at the bottom center lets you place a pet straight on the ground; Proppo exports static models with a bottom-center pivot by default.

Import a 3D model into Roblox Studio

A Model property that names one of its parts as the main part. When it is set, the model's pivot follows that part, which makes moving a whole pet model with PivotTo predictable.

How to animate a Roblox pet

A MeshPart property that controls how much detail Roblox draws: Automatic (lowers detail with distance), Precise (always full detail) or Performance (always reduced). Automatic is the usual choice for pets.

Triangle and texture limits

Roblox's unit of length. Roblox's units page converts 1 stud to 28 cm. Models exported from Proppo use 1 unit = 1 stud, with a default height of 3 studs for a pet and 3.5 for an egg.

Import a 3D model into Roblox Studio

An object you put inside a MeshPart to give it PBR textures: ColorMap, NormalMap, RoughnessMap and MetalnessMap. Normal maps must be OpenGL tangent-space. If a model imports grey, adding a SurfaceAppearance with its ColorMap usually fixes it.

Import a 3D model into Roblox Studio

By default Roblox only plays an animation asset in experiences owned by the same user or group that owns the animation, unless it is shared through Creator Hub permissions. Publish pet animations with the account or group that owns the game.

Import a 3D model into Roblox StudioHow to animate a Roblox pet

To play animations on a rig without a Humanoid, such as a pet, Roblox uses an AnimationController with an Animator inside it. A script loads an Animation with Animator:LoadAnimation() and calls Play() on the track.

How to animate a Roblox petImport a 3D model into Roblox Studio

Placing a skeleton and its weights automatically instead of by hand. Many auto-riggers target humanoids; Proppo's own auto-rig has templates for four-legged and two-legged pets, fish, birds, snakes, jellies and a simple bounce, each with an Idle and a move loop.

How to animate a Roblox petRoblox pet generator

A skeleton of bones inside a mesh that lets it bend. A rigged model imported into Roblox gets Bone objects under its MeshPart, and animations move those bones.

How to animate a Roblox pet

Binding a mesh's vertices to the bones of a rig so the surface follows the skeleton. Roblox allows at most 4 bone influences per vertex, and the root bone should sit at the origin without influences.

How to animate a Roblox petImport a 3D model into Roblox Studio

The numbers that say how strongly each bone moves each vertex; per vertex they add up to 1. Bad weights cause tearing or rubbery stretching when the pet animates.

How to animate a Roblox pet

A relative number that sets a pet's chance in an egg: chance = its weight divided by the sum of all weights in that egg. If eggs can be bought with Robux or paid currency, Roblox's policy asks you to show every outcome's odds before purchase.

Egg rarity tablesRoblox egg generator

How many pets a player can have equipped (following them and adding multipliers) at once, often raised by upgrades or game passes. It also bounds how many pet meshes each player adds to the scene, which is why triangle budgets matter.

Triangle and texture limitsEgg rarity tables

Opening an egg, usually for in-game currency, to get a random pet from that egg's drop table. Games often add hatch animations, multi-hatch and auto-hatch.

Egg rarity tablesRoblox egg generator

The bonus an equipped pet gives, such as ×1.5 coins or damage. Rarer pets and variants usually carry bigger multipliers, which is what makes players chase them.

Egg rarity tables

A rule that limits bad luck: hard pity guarantees a rare result after a set number of misses, soft pity raises the odds a little with every miss. Pity changes the real odds, so explain it to players.

Egg rarity tables

A named level such as Common, Rare, Epic, Legendary or Mythic that tells players how hard a pet is to get. Each tier usually has its own color, drop chance and stat range.

Egg rarity tables

Resetting progress such as currency or upgrades in exchange for a permanent boost. Rebirths give long-term players a reason to keep grinding.

Egg rarity tables

A rarer version of the same pet, such as Gold, Rainbow or Shiny (a new color or material) or Huge (a scaled-up copy), usually with a bigger multiplier. Variants reuse the base mesh and rig; Proppo makes a rarity set (Gold, Diamond, Shadow, Rainbow, Neon) from one model in one step.

Egg rarity tablesRoblox pet generator