【Rhino】【Python】Select Circular Objects Within Specified Radius Range

Rhino Python Script: Selecting Circles by Radius

Overview

This Python script for Rhinoceros (Rhino) selects circular objects within a specified radius range.

Key Features

• Scans all objects in Rhino
• Identifies circular objects
• Filters circles based on user-defined radius range
• Selects matching circular objects

Code Analysis

import rhinoscriptsyntax as rs
import Rhino.Geometry as rg

def select_circles_by_radius(min_radius=0, max_radius=float('inf'), tolerance=0.01):
    all_objects = rs.AllObjects()
    circles = []
    
    for obj in all_objects:
        try:
            geometry = rs.coercegeometry(obj)
            if isinstance(geometry, rg.Curve) and geometry.IsCircle(tolerance):
                success, circle = geometry.TryGetCircle()
                if success:
                    radius = circle.Radius
                    if min_radius <= radius <= max_radius:
                        circles.append(obj)
        except Exception as e:
            print("Error processing object:", str(e))
            continue
    
    if circles:
        rs.SelectObjects(circles)
        print("Selected {} circles with radius between {} and {}.".format(len(circles), min_radius, max_radius))
    else:
        print("No circles found with radius between {} and {}.".format(min_radius, max_radius))

# Usage example
select_circles_by_radius(5, 10)

Implementation Details

1. Module Import : Utilizes rhinoscriptsyntax and Rhino.Geometry.

2. Function Definition : select_circles_by_radius accepts minimum radius, maximum radius, and tolerance.

3. Object Iteration: Processes all objects in the document.

4. Circle Identification:

   • Converts objects to geometry.
   • Checks for curve type and circularity.

5. Circle Information Extraction : Uses TryGetCircle() method.

6. Radius Filtering: Checks if the radius is within the specified range.

7. Object Selection : Selects filtered circles using rs.SelectObjects().

select_circles_by_radius(5, 10)  # Selects circles with radii between 5 and 10

Applications

• Selecting circular holes or columns of specific sizes.
• Locating circular elements in complex models.
• Quality control for circular object dimensions.