Model

Sets the level of detail on Model instances. When Workspace.StreamingEnabled is enabled, parts outside of the streaming radius cannot be seen in live games. Using Model.LevelOfDetail, you can make these parts visible.

When set to StreamingMesh, representative meshes renders outside the streaming radius. Representative meshes, also called imposter meshes, are colored, coarse meshes that wrap around all child parts of a model.

Setting it to Disabled or Automatic (default) deletes what has been generated.

For Models with this property set to StreamingMesh, the Model Mesh, a coarse mesh representation of the Model including standard part types, mesh parts and CSG parts, is precomputed during the Studio session, and serialized and uploaded as part of the place file.

Modeling Tips:

• Automatic update in Studio editing - Changes to the model or any of its children, e.g. adding/deleting/repositioning child parts, resetting colors, will automatically update the representative mesh.

• Memory sharing - If you have hundreds of identical models in different sizes and orientations, it is more efficient to duplicate them over transforming to avoid individual editing unless necessary.

• Outside of streaming radius - Streaming is distance based. We consider models crossing the boundary of the streaming sphere as outside. This requires the model size in StreamingMesh to be much smaller than the streaming radius.

• Hierarchical models - If a model and its child or grandchild models are all set to StreamingMesh, only the ancestor, which is the top most model, will be rendered in game. For better memory performance, you may want to disable the LevelOfDetail property of child models before releasing your game.

• Loose low-resolution wrapping - You can set a small workspace streaming radius value (e.g. 256 studs) to see representative meshes closer in Studio playsolo, but remember representative meshes are designed to be seen at a distance (1024 studs away). They may not capture model fidelity well to keep triangle count per model low.

• Partial Streaming behavior - While a Model is not completely streamed in, the Model Mesh is rendered instead of individual parts of the model. Once all individual parts of a model are streamed in, individual parts render and the Model Mesh is ignored.

• Physics Significance - Model Meshes have no physics significance. They act as non-existent with respect to raycasting, collision detection and physics simulation.

Controls how Model instances are streamed in and out when streaming is enabled. Behavior depends on selected enum. Has no effect when experience is not streaming enabled.

Should only be changed in Studio and in Scripts, never in LocalScripts (doing so can result in undefined behavior).

Points to the primary part of the Model. The primary part is the BasePart that acts as the physical reference for the pivot of the model. That is, when parts within the model are moved due to physical simulation or other means, the pivot will move in sync with the primary part. If the primary part is not set, the pivot will remain at the same location in world space even if parts within the model are moved.

Note that when setting this property, it must be a BasePart that is a descendant of the model. If you try to set Model.PrimaryPart to a BasePart that is not a descendant of the model, it will be set to that part but reset to nil during the next simulation step — this is legacy behavior to support scripts which assume they can temporarily set the primary part to a BasePart which isn't a descendant of the model.

The general rule for models is that:

• Models whose parts are joined together via physical joints such as WeldConstraints or Motor6Ds should have a primary part assigned. For example, Roblox character models have their Model.PrimaryPart set to the HumanoidRootPart by default.
• Static (usually Anchored) models which stay in one place unless a script explicitly moves them don't require a Model.PrimaryPart and tend not to benefit from having one set.

This property determines where the pivot of a Model which does not have a set Model.PrimaryPart is located. If the Model does have a PrimaryPart, the pivot of the Model is equal to the pivot of that primary part instead, and this WorldPivot property is ignored.

For a newly created Model, its pivot will be treated as the center of the bounding box of its contents until the first time its Model.WorldPivot property is set. Once the world pivot is set for the first time, it is impossible to restore this initial behavior.

Most commonly, moving the model with the Studio tools, or with model movement functions such as PVInstance:PivotTo() and Model:MoveTo(), will set the world pivot and thus end this new model behavior.

The purpose of this behavior is to allow Lua code to get a sensible pivot simply by creating a new model and parenting objects to it, avoiding the need to explicitly set Model.WorldPivot every time you create a model in code.

local model = Instance.new("Model")
workspace.BluePart.Parent = model
workspace.RedPart.Parent = model
model.Parent = workspace

print(model:GetPivot())  -- Currently equal to the center of the bounding box containing "BluePart" and "RedPart"

model:PivotTo(CFrame.new(0, 10, 0))  -- This works without needing to explicitly set "model.WorldPivot"

This function returns a description of a volume that contains all BasePart children within a Model. The volume's orientation is based on the orientation of the PrimaryPart, and matches the selection box rendered in Studio when the model is selected. The description is provided in the form of a CFrame orientation and Vector3 size.

Mirroring the behavior of Terrain:FillBlock(), it returns a CFrame representing the center of that bounding box and a Vector3 representing its size.

If there is no PrimaryPart for the model, the BoundingBox will be aligned to the world axes.

Example

Pictured below is a Model with a pink semitransparent Part whose CFrame and Size have been set to the return values of this function called on the model.

Usage

local model = workspace.Model
local part = workspace.Part
local orientation, size = model:GetBoundingBox()
part.Size = size
part.CFrame = orientation

Returns the size of the smallest bounding box that contains all of the BaseParts in the Model. If Model.PrimaryPart exists then the bounding box will be aligned to that part. If a primary part has not been set then the function will chose a part in the model to align the bounding box to. As the selection of this part is not deterministic it is recommended to set a Model.PrimaryPart to get consistent results with this function.

Note this function only returns the size of the smallest bounding box, and the developer must employ their own method to obtain the position of the bounding box.

Moves the PrimaryPart to the given position. If a primary part has not been specified, the root part of the model will be used, but the root part is not deterministic and it is recommended that you always set a primary part when using MoveTo().

If there are any obstructions where the model is to be moved, such as Terrain or other BaseParts, the model will be moved vertically upward until there is nothing in the way. If this behavior is not desired, PVInstance:PivotTo() should be used instead.

Note that rotation is not preserved when moving a model with MoveTo(). It is recommended to use either TranslateBy() or PVInstance:PivotTo() if the current rotation of the model needs to be preserved.

Shifts a Model by the given Vector3 offset, preserving the Model's orientation. If another BasePart or Terrain already exists at the new position then the Model will overlap said object.

The translation is applied in world space rather than object space, meaning even if the model's parts are orientated differently it will still move along the standard axis.