Model Type: Revolution 1.0

Figure 20: Revolution Geometry Model

Caption
Revolution geometry. The 3D surface is generated by revolving the profile defined by points for example $a$–$b$–$c$–$d$ around the vertical axis. These points form the generating curve of the solid, precomputed to create smooth filled quad strips.

The Revolution 1.0 model generates a 3D solid or surface by revolving a 2D profile around a specified axis. This is ideal for turned or axisymmetric parts (vases, domes, bases, circular panels). The generating curve is defined in the paths array and is interpreted in the plane orthogonal to the chosen axis.

Purpose: Create revolved geometry (e.g., handles) by revolving a 2D path around an axis.
Supports: Full or partial revolutions (sweep angle). Closed profiles make solids, open profiles make surfaces (like vases or bottles).
Recommended For: Rotationally symmetric geometry such as turned bases, bowls, domes, circular trims, and circular tables.

[] *Figure: Revolution geometry. The 3D surface is generated by revolving the profile defined by points (e.g., $a$–$b$–$c$–$d$) around the vertical axis. These points form the generating curve of the solid.* newpage

Required Parameters

paths (array): Defines one or more 2D profiles. Each profile must have a unique id and a path array describing the curve (SVG-like commands). The profile parameter below references an id from this array.
revolution (object): Contains the operation parameters.

revolution (object) Parameters

Parameter	Type/Enum	Required	Default	Description
:—	:—	:—	:—	:—
profile	string	Yes	-	The `id` of the path (from `paths`) to be revolved. Example: ` { “profile”: “revolveProfile” } `
axis	string [“x”,“y”,“z”]	No	“z”	The axis around which the profile is revolved.
angle	number (degrees)	No	360	Sweep angle of the revolution. Values $<360$ produce partial, often open, geometry.
centerOffset	number (mm)	No	0	Distance to shift the rotation center relative to the profile (for off-axis parts).

—

Optional Parameters

quality (number): Controls tessellation density (default: 25). Higher values yield smoother surfaces.
uv (object): UV mapping parameters. (See UV Coordinates section.)
shading (object): Shading/hint parameters. (See shading section.)

Important Notes

The profile referenced in revolution.profile must exist in the paths array.
Closed profiles create watertight solids; open profiles create surfaces.
Curved commands (C, Q, A) require a suitable quality value to prevent faceting or self-intersections, especially near the rotation axis.
Partial sweeps (angle < 360) produce open geometry. Exercise caution when exporting to formats (like STEP) that require watertight solids.

This section describes the geometry generation behavior of the Revolution 1.0 model, applicable in IG.Model.Processor version ≥ 1.4.0.100.