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bonsai-impl-qto

Calculate BIM element quantities from IFC geometry using QtoCalculator.

30|4|Updated Mar 5, 2026
Search Tags:#automation#cost estimation#blender#ifc#bim#quantity takeoff#bonsai
One-click install
npx skills add https://github.com/OpenAEC-Foundation/Blender-Bonsai-ifcOpenshell-Sverchok-Claude-Skill-Package --skill bonsai-impl-qto
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: bonsai-impl-qto
Source: https://github.com/OpenAEC-Foundation/Blender-Bonsai-ifcOpenshell-Sverchok-Claude-Skill-Package/tree/main/skills/bonsai/impl/bonsai-impl-qto
Command: npx skills add https://github.com/OpenAEC-Foundation/Blender-Bonsai-ifcOpenshell-Sverchok-Claude-Skill-Package --skill bonsai-impl-qto

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill automates the complex and time-consuming process of calculating material quantities (like volume, area, weight, and length) for Building Information Modeling (BIM) elements directly within Blender, ensuring accuracy and consistency.

Core Features & Use Cases

  • Comprehensive Quantity Calculation: Supports linear, area, volume, and weight quantities for various BIM elements (walls, slabs, columns, etc.).
  • Gross vs. Net Quantities: Accurately calculates quantities considering openings (doors, windows) for precise material and cost estimation.
  • Workflow Automation: Integrates with Bonsai's operator system for batch processing and single-item calculations.
  • Use Case: Automatically calculate the net volume and surface area for all walls in a BIM model, including subtractions for doors and windows, to provide accurate material takeoffs for cost estimation.

Quick Start

Run the batch quantity takeoff for all wall elements using the 'Qto_WallBaseQuantities' rule.

Frequently Asked Questions about bonsai-impl-qto

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I automate BIM quantity takeoffs in Blender?▼

Automate BIM quantity takeoffs in Blender by using Bonsai's QtoCalculator to compute base quantities from IFC element geometry. You can batch process building elements to automatically calculate volume, area, length, and weight.

Can I calculate net wall volumes excluding openings like doors and windows?▼

Yes, you can calculate net wall volumes by configuring Bonsai quantity takeoff workflows to account for openings. This ensures precise gross versus net material subtractions for accurate cost estimation and material takeoffs.

How does IFC element geometry analysis work for base quantity computation?▼

IFC element geometry analysis works by processing spatial data through Bonsai's QtoCalculator to derive base quantities. It automatically populates IfcElementQuantity sets with calculated area, length, volume, and weight metrics.

What is the best way to batch process quantity sets across multiple building elements?▼

The best way to batch process quantity sets is by running Bonsai's automated base quantity computation operators. This applies predefined rules like 'Qto_WallBaseQuantities' across multiple building elements for bulk quantity operations.

Can I define custom quantity sets for IFC elements in BIM models?▼

Yes, you can define custom quantity sets for IFC elements within Bonsai. The system supports custom quantity set definitions alongside standard IfcElementQuantity sets, allowing tailored property tracking for specific project requirements.

Do I need any specific dependencies to calculate material quantities from IFC files?▼

No specific external dependencies are required to calculate material quantities from IFC files. The Bonsai quantity takeoff pipeline operates autonomously within Blender to analyze geometry and export quantities.

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