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====== Model Type: Extrusion 1.1 ======

^ **Figure 19: Extrusion 1.1 Model** ^
| {{:ig:gfx:modelprocessor:extrusion_grpahic.png?nolink&600|}} |
^ Caption ^
| 3D illustration of the Extrusion 1.0 model. A 2D profile (\textit{a}, \textit{b}, \textit{c}, \textit{d}, \textit{e}, \textit{f}) defined in the **paths** array is extruded along the $E$ vector with default 'up' as $U$ (parallel to the $z$-axis) by a specified **length**. It is typically used to generate flat laying surfaces; with $U = Z$, the surface lies horizontally. |



The **Extrusion 1.1** model generates a 3D solid by extruding a 2D profile along a specified axis. This model is ideal for producing flat or vertically extended components, where the shape is constant along the extrusion direction.

  * **Purpose:** Used to generate extrusion shapes from 2D cross-sectional paths.
  * **Supports:** Linear extrusion only (no tapers or sweeps).
  * **Recommended For:** Profiles intended to become horizontal panels, beams, or similar parts.

[]
*Figure: 3D illustration of the Extrusion 1.0 model. A 2D profile (**a**, **b**, **c**, **d**, **e**, **f**) defined in the **''paths''** array is extruded along the $E$ vector with default 'up' as $U$ (parallel to the $z$-axis) by a specified **''length''**. It is typically used to generate flat laying surfaces; with $U = Z$, the surface lies horizontally.*


=== Required Parameters ===

  * **''paths''** (array): Defines one or more 2D profiles using move, line, and curve segments. In this case only one can be used at the moment of generation.
  * **''extrusion''** (object): Contains the profile name and the extrusion **''length''**.

=== Optional Parameters ===

  * **''quality''** (number): Controls the smoothness of curved surfaces (default: 25).
  * **''upvector''** (string): Direction of exporting mesh; "x", "y", or "z" (default: "z").
  * **''uv''** (object): Texture mapping controls for UV unwrapping. See //UV Coordinates// section.

=== Important Notes ===

  * All profiles must be **closed path** as usual to produce valid geometry.
  * Curved profiles with commands like **C**, **Q**, or **A** require appropriate **''quality''** to avoid visible faceting or self-intersections.

//This section describes the geometry generation behavior of the Extrusion 1.1 model, applicable in IG.Model.Processor version ≥ 1.4.0.100.//


===== History =====

^ **Version** ^ **Date** ^ **Changes / Notes** ^ **Processor Version** ^
| **1.1** | 2025-10-30 | Support for soft and flat shading, auto UV, and new deduplication for mesh.| ≥ 1.4.0.100 |
| **1.0** | 2025-08-12 | Initial implementation of linear extrusion from closed 2D profiles. | 1.3.0.100 |