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====== Model Configuration and Parameters ======

===== Setting Up Paths for Model.Processor =====

==== Introduction Paths ====

This section explains how 2D paths, used as profiles in 3D modeling, are defined and parsed. Paths are typically specified using **SVG** (Scalable Vector Graphics) commands, which describe movements, lines, and curves to form complex shapes. These paths are converted into a structured **JSON format** to be used programmatically within the IG.Model.Processor software.

Understanding SVG path commands is essential because the software interprets these commands to generate precise geometry. The following subsections detail the key SVG commands supported, their usage, and how they translate into the custom JSON format.

==== Understanding SVG Form ====

We provide a brief overview of SVG file path commands. The table below lists the individual commands used to construct paths in SVG format. This documentation summarizes the key commands relevant to their use within this software.

=== SVG Commands that are supported by Model.Processor ===

| Command | Name | What it Does |
| :---: | :--- | :--- |
| **M/m** | Move To | Moves the pen to (x, y) without drawing a line. |
| **L/l** | Line To | Draws a straight line to (x, y). |
| **H/h** | Horizontal Line To | Draws a horizontal line to x. |
| **V/v** | Vertical Line To | Draws a vertical line to y. |
| **Z/z** | Close Path | Closes the current path by drawing to the start. |

=== Curve Commands ===

| Command | Name | What it Does |
| :---: | :--- | :--- |
| **C/c** | Cubic Bezier Curve | Draws a curve using two control points and an end point. |
| **S/s** | Smooth Cubic Bezier Curve | Continues a cubic curve with one control point (auto-reflects). |
| **Q/q** | Quadratic Bezier Curve | Uses one control point and an end point. |
| **T/t** | Smooth Quadratic Curve | Continues a quadratic curve (auto-reflects control point). |

=== Arc Command ===

| Command | Name | What it Does |
| :---: | :--- | :--- |
| **A/a** | Elliptical Arc | Draws an arc curve (ellipse shape) with radii, rotation, and flags. |

==== JSON Path Commands in IG.Model.Processor\\(in millimeters) ====

The following commands are supported in the JSON format. Each command's **uppercase** form denotes **absolute positioning**, and the **lowercase** form denotes **relative positioning**, following the provided in this link [[https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Paths|SVG Path Data specification]].

| Command | Description |
| :--- | :--- |
| **''M xy'' / ''m xy''** | Move To (absolute / relative) |
| **''L xy'' / ''l xy''** | Line To (absolute / relative) |
| **''H x'' / ''h x''** | Horizontal Line To (absolute / relative) |
| **''V y'' / ''v y''** | Vertical Line To (absolute / relative) |
| **''Z'' / ''z'', ''E'' / ''e''** | Close Path (no parameters). **''E''** is a custom synonym. |
| **''C x1 y1 x2 y2 x y'' / ''c x1 y1 x2 y2 x y''** | Cubic Bézier Curve (absolute / relative) |
| **''Q x1 y1 x y'' / ''q x1 y1 x y''** | Quadratic Bézier Curve (absolute / relative) |
| **''A'' / ''a'' ''rx ry x-axis-rotation large-arc-flag sweep-flag x y''** | **Elliptical Arc Curve**\\Parameters:\\* //x, y//: Ellipse radii\\* //x-axis-rotation//: Ellipse rotation in degrees\\* //large-arc-flag//: Selects the larger (1) or smaller (0) arc\\* //sweep-flag//: Determines arc direction (1 or 0)\\* //x, y//: Arc end point |

Relative commands (lowercase like l, m, c) move relative to the current point.
Example: **l 50 0** means “draw a line 50 units over from where I am now.”

Absolute commands (uppercase like L, M, C) move to exact coordinates in the SVG canvas.
Example: **L 100 100** means “draw a line to exactly (100, 100).”

Both do the same kinds of things (move, curve, etc.), but relative is like “step this far from here,” and absolute is like “go exactly there.”

----


==== JSON Examples for Each Path Command ====

Each command in the JSON format is stored within the **"paths"** array,
where each element represents a single path definition containing a **"path"** object.
This **"path"** array holds the individual drawing commands, corresponding directly
to SVG path operations such as **M**, **L**, **C**, **Q**, and **A**.

<code json>
"paths": [
	{
		"id": "panel",
		"path": [
		{
			"type": "M",
			"end": { "x": 4.25, "y": -9.44 },
			"controlPoints": []
		},
		{
			"type": "A",
			"end": { "x": -7.13, "y": 0.00 },
			"controlPoints": []
		}
		]
	}
]
</code>

**Move Command (M / m)**
<code json>
	{
		"type": "M",
		"end": {
			"x": 0,
			"y": 0
		},
		"controlPoints": []
	}
</code>
Moves the current cursor position to a given coordinate without drawing a line.
The lowercase form ''m'' moves relative to the current point.

**Line Command (L / l)**
<code json>
	{
		"type": "L",
		"end": {
			"x": 360,
			"y": 0
	      },
		"controlPoints": []
	}
</code>
Draws a straight line from the current position to the specified end coordinate.
''l'' is the relative variant.

**Horizontal Line (H / h)**
<code json>
	{
		"type": "H",
		"end": {
			"x": 200,
			"y": 0 },
		"controlPoints": []
	}
</code>
Draws a horizontal line to a specific ''x'' position.
''h'' is the relative variant, shifting from the current position.

**Vertical Line (V / v)**
<code json>
	{
		"type": "V",
		"end": {
			"x": 0,
			"y": 300
			},
		"controlPoints": []
	}
</code>
Draws a vertical line to the given ''y'' coordinate (absolute or relative).

**Cubic Bézier Curve (C / c)**
<code json>
	{
		"type": "C",
		"end": {
			"x": 100,
			"y": 200
			},
		"controlPoints": [
		{ "x": 30, "y": 80 },
		{ "x": 70, "y": 150}
		]
	}
</code>
Creates a smooth curve using two control points that define tangents and curvature.
The lowercase ''c'' version works with relative coordinates.

**Quadratic Bézier Curve (Q / q)**
<code json>
	{
		"type": "Q",
		"end": {
			 "x": 100,
			 "y": 200
			 },
		"controlPoints": [
		{ "x": 50, "y": 100 }
		]
	}
</code>
Draws a single-control-point curve between the current and end positions.
Simpler than the cubic variant but less flexible.

**Elliptical Arc (A / a)**
<code json>
	{
		"type": "A",
		"end": {
			"x": 131.989,
			"y": 73.5151
			},
		"controlPoints": [],
		"arcData": {
			"radius":
			{ "isEmpty": 0,
				"x": 47.2259,
				"y": 47.2259 },
			"xAxisRotation": 0,
			"LargeArc": 0,
			"Sweep": 1
		}
	}
</code>
Draws an elliptical arc with defined radii, rotation, and directional flags.
**arcData** contains all arc parameters:
  * ''radius.x'', ''radius.y'' – ellipse radii in millimeters
  * ''xAxisRotation'' – rotation of the ellipse (degrees)
  * ''LargeArc'' – selects the larger (1) or smaller (0) arc
  * ''Sweep'' – direction of drawing (1 = clockwise, 0 = counterclockwise)

**Close Path (Z / z) or Extended Close (E / e)**
<code json>
	{
		"type": "Z",
		"end": { "x": 0, "y": 0 },
		"controlPoints": []
	}
</code>
Closes the current path by connecting back to its start point.
''E/e'' acts as a supported synonym in the IG.Model.Processor.

All coordinates are expressed in **millimeters**.
For linear commands (''M'', ''L'', ''H'', ''V'', ''Z''), ''controlPoints'' remain empty.

----

==== Reqirements for paths ====
An updated ''board_clean_closed.svg'' file has been uploaded to the repository. This file serves as a reference and replaces the earlier ''board_clean.svg'' version, now explicitly including the ''Z'' command (close path) to ensure mathematical correctness. The following requirements apply:
{{ :ig:gfx:modelprocessor:valid_invalid_polygon.jpg?600 |}}
  * The plane must be defined as a **closed 2D shape**.
  * A valid polygon is expressed as:
    $v_0, v_1, v_{n-1}, v_n = v_0$
    where ''v0'' to ''vn'' are the vertices of the polygon, and ''vn'' should coincide with ''v0'' to close the loop.
  * The polygon must be **non-self-intersecting**.
  * The first and last vertices must **coincide** (''vn'' = ''v0'').
  * Profiles or bevels are typically constructed from connected path segments (lines, curves, etc.) that **return to the start point to form a closed loop**.
  * **Important Note**: Paths that are open (e.g., ''M 0 0 L 100 0 L 100 50 M 50 100'')—meaning they lack a closing command (''Z'')—may be not valid for extrusion and cannot form a prism without an automatic closure, which supported by this software, but only if last point coincide with the firts one. IG.Model.Processor will attempt to close such path, but generally it is wrong definition. Such cases should be avoided to ensure precise geometry. IG.Model.Processor may attempt to close such paths, but behavior in this cases may be unpredictable.

[]

Now that you know commands, you can have a look at the JSON sample on the next page. Don't forget that there are also sample files that are using the same profile as on page //profiles// (The page reference has been converted to an italicized placeholder as the target page is unknown).

----

==== Small full example of JSON Path with commands: ====
<code json>
{
	{
		"paths": [
		{
			"id": "board",
			"path": [
			{
				"type": "M",
				"end": {
					"x": 8.233,
					"y": 2.403
				},
				"controlPoints": []
			},
			{
				"type": "l",
				"end": {
					"x": -0.005,
					"y": -2.223
				},
				"controlPoints": []
			},
			{
				"type": "c",
				"end": {
					"x": 0.056,
					"y": 0.600
				},
				"controlPoints": [
				{
					"x": 0.044,
					"y": 0.202
				},
				{
					"x": 0.120,
					"y": 0.392
				}
				]
			},
			{
				"type": "E",
				"end": {},
				"controlPoints": []
			}
			]
		}
		]
	}
	
</code>

**Parsing Logic:**
  - The SVG path string is tokenized into commands and coordinate values.
  - Each command is mapped into a JSON object:
    - ''M'', ''L'', ''H'', ''V'', etc. are stored with their corresponding ''end'' point.
    - Curve commands (''C'',''Q'',) store their ''end'' point along with ''controlPoints''.
  - The command ''E'' command marks the end of the path sequence in the JSON format, alternatively you can command ''Z'' (command ''E'' is a custom addition, not part of standard SVG).

**Important Notes:**
  - All coordinates are kept in **millimeters** the same units as the original SVG as samples. If your SVG file is deifferent units a converter should be used!
  - The JSON format simplifies parsing later in your system because each command is fully expanded into its components.
  - ''h'', ''H'' — Horizontal lines: only the ''x'' value is required; the ''y'' value is ignored.
  - ''v'', ''V'' — Vertical lines: only the ''y'' value is required; the ''x'' value is ignored.

Including the unused coordinate does not cause errors, but it may be omitted for clarity.

==== Referencing Path Definitions via the ''profile'' Parameter ====

Each entry in the ''frame'' array must specify which path definition to use for that board. This is done by setting the **''profile''** field to the **''id''** of one of the objects in the top-level **''paths''** array.

  * In the ''paths'' array, each object has an **''id''** (e.g. ''board'') and a corresponding **''path''** sequence.
  * Within each frame entry, the **''profile''** key is a ''string'' that must exactly match one of these **''id''** values.
  * At runtime, the processor looks up the path definition whose **''id''** equals the **''profile''** string and applies that geometry to the board.

**Example:**
<code json>
"paths": [
	{
		"id": "board",
		"path": [ … ]
	}
],
"frame": [
	{
		"board": "1",
		"position": { "x": 0, "y": 0 },
		"profile": "board",      // ← references the path with id = "board"
		"uv": { "rotation": 90 }
	},
	…
]
</code>
In this example, the frame entry for ''board = "1"'' uses the path whose ''id'' is **"board"**. Changing **"profile"** to another valid **"id"** will substitute a different shape definition for that board.