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Extrusion Assets

Extrusion Asset sample

Extrusion assets are used to create extruded geometry for features such as walls, guard rails, and fences.

Creation

Create these assets from within the RoadRunner Library Browser.

Extrusions can combine an extruded cross section (such as the metal railing of a guard rail) with regularly spaced props (such as the wooden posts of the guard rail). These extrusions can be placed along curves using the Prop Curve Tool, and along road spans using the Prop Span Tool.

Refer to the Library Browser page for general instructions to create, edit, and delete assets.

Extrusion Asset Attributes

AttributeDescription
Default SpacingControls how often a prop is placed along the extrusion.
Instance OffsetAn offset (in the space of the curve) applied to all props placed along the extrusion.
Item 0, 1, and so onRefer to: Add a Repeating Prop to an Extrusion.

You can add a constant offset to all props placed along the extrusion by adjusting the "Instance Offset" attribute in the Attributes Panel.

Edit the Shape of an Extrusion

  1. Select an extrusion style in the Library Browser to view the extrusion profile in the 2D Edit Window.

  2. See Curve Editing.

The editing controls for extrusions differ from most curve-based tools. For example, there is no explicit tangent control or tangent locking/unlocking. To create a sharp angle, you would create two curves and drag the endpoints of one until it snaps to the end of the other.

Assign Materials to an Extrusion

  1. Select an extrusion style in the Library Browser to view the extrusion profile in the 2D Edit Window.

  2. Select an extrusion curve in the 2D Edit Window.

  3. Modify any of the following attributes in the Attributes Panel.

AttributeDescription
MaterialMaterial Asset to apply to the selected extrusion curve.
Texture SizeTexture coordinate scale for the selected extrusion curve.
Two Sided

Whether the material applies to both sides of the selected extrusion curve or a single side.

Two-sided is typically only used for thin fences (for example, chain link fences).

Add a Repeating Prop to an Extrusion

You can add regularly spaced props along an extrusion. This is useful to add posts and other supports along the extrusion.

Note that extrusion assets behave much like Prop Set Assets. Refer to that documentation for instructions on adding and removing prop items on an extrusion asset.