Polygon Model

A Polygon Model item loads and displays a 3D polygon mesh in the scene. udStream supports the glTF 2.0 format (.gltf and .glb files).

See Importing Model Data for details on supported file formats.

Creating a Polygon Model

Drag and Drop — Drag a .gltf or .glb file from your file explorer and drop it into the scene viewport.
Add Scene Item — Click the Add Scene Item button and enter the file path or URL to a glTF file.

Position X / Y / Z — World-space position of the model's origin.
Rotation Y / P / R — Yaw, pitch, and roll of the model in degrees.
Scale X / Y / Z — Scale of the model along each axis.
Y-Up — Enable this if the model uses a Y-up coordinate system (as is common in many 3D authoring tools). When disabled, the model is treated as Z-up.

Culling Face — Controls which faces are culled (hidden):
- Back — Standard back-face culling (default). Hides surfaces facing away from the camera.
- Front — Cull front faces.
- None — Render both sides of every face.
Ignore Tint — If enabled, the model ignores the global scene tint colour.
Tint — A colour tint applied to the entire model.

Expanding a polygon model shows the file path and model metadata.

Option	Description
Edit Name	Rename the item.
Move To	Move the camera to frame the model.
Remove Item	Delete the item from the scene.

Key	Type	Description
`yUp`	bool	Treat the model as Y-up rather than Z-up.
`culling`	string	Face culling mode: `back`, `front`, or `none`.
`ignoreTint`	bool	Ignore the global scene tint.
`tint`	uint	Model tint colour (BGRA packed, default: white `0xFFFFFFFF`).
`transform.rotation.y`	double	Yaw rotation in degrees.
`transform.rotation.p`	double	Pitch rotation in degrees.
`transform.rotation.r`	double	Roll rotation in degrees.
`transform.scale.x`	double	Scale along the X axis.
`transform.scale.y`	double	Scale along the Y axis.
`transform.scale.z`	double	Scale along the Z axis.