Allplan Visual Scripting: Parametric Design Automation Without Coding

Allplan Visual Scripting: Parametric Design Automation Without Coding

I'm not a programmer, so when I heard about Allplan Visual Scripting (AVS), I was skeptical that a node-based tool could replace actual coding. But after using it for a few months, I was automating repetitive tasks that used to eat up my afternoons. AVS is similar to Dynamo for Revit or Grasshopper for Rhino — you connect nodes to create parametric logic without writing a single line of code. Let me show you how I use it.

Accessing Visual Scripting

1. Tools > Visual Scripting (or press the AVS icon in the toolbar)
2. The Visual Scripting panel opens on the right side
3. The canvas is where you connect nodes
4. The node library is accessible from the left side of the panel

Node Library Categories

AVS nodes are organized by category:

• Geometry: Create and manipulate 2D/3D geometry (points, lines, curves, surfaces, solids)
• BIM Elements: Create Allplan building elements (walls, slabs, columns, beams)
• Math: Mathematical operations (add, subtract, multiply, sin, cos, range, series)
• Logic: Conditional operations (if/else, boolean, filter, list operations)
• Input: Data input (number slider, text input, file path, CSV reader)
• Output: Data output (Allplan elements, text, file export)
• List: List operations (map, flatten, sort, group, split)
• Curve: Curve operations (evaluate, divide, offset, loft)
• Surface: Surface operations (evaluate, divide, extrude)
• Analysis: Building analysis (area calculation, volume, orientation)

Basic Workflow

Step 1: Define Input Parameters

1. Drag a Number Slider node from Input category
2. Set range (e.g., 3.0 to 6.0) and step (0.1)
3. This represents a variable like building height or floor height

Step 2: Build Logic

1. Drag a Series node from Math category
2. Connect the slider output to the Series start input
3. Set count (e.g., 5 for 5 floors) and step (e.g., 3.5 for floor height)
4. The Series generates a list of elevations: [3.5, 7.0, 10.5, 14.0, 17.5]

Step 3: Generate Geometry

1. Drag a Slab node from BIM Elements category
2. Connect the Series output to the Slab elevation input
3. Connect a polygon (drawn in Allplan or generated) to the Slab outline input
4. AVS generates 5 slabs at the calculated elevations

Step 4: Output to Allplan

1. Drag an Allplan Output node
2. Connect the Slab output to the Allplan Output
3. Click "Run" in the AVS toolbar
4. The slabs appear in the Allplan 3D model

Practical Example: Parametric Facade Panels

Scenario

Generate facade panels on a building wall with adjustable panel width, height, and spacing.

Node Setup

1. Input: Number Slider — Panel Width (range: 600-1200mm, step: 50)
2. Input: Number Slider — Panel Height (range: 1200-2400mm, step: 100)
3. Input: Number Slider — Gap Width (range: 20-100mm, step: 10)
4. Geometry: Wall Surface — Select the wall face in Allplan
5. Math: Division — Divide wall width by (Panel Width + Gap Width) to get panel count
6. Math: Series — Generate X positions for each panel
7. Geometry: Rectangle — Create panel rectangle at each X position
8. BIM Elements: Panel — Create facade panel from each rectangle
9. Output: Allplan Elements — Send panels to Allplan model

Running the Script

1. Click "Run" in AVS
2. Panels appear on the wall in Allplan
3. Adjust any slider (e.g., change Panel Width from 900 to 1200)
4. Click "Run" again
5. Panels regenerate with the new width

Practical Example: Adaptive Floor Plan Layout

Scenario

Generate apartment unit layouts based on a corridor line and unit width parameter.

Node Setup

1. Input: Curve — Select the corridor centerline
2. Input: Number Slider — Unit Width (range: 4.0-8.0m, step: 0.5)
3. Curve: Divide by Length — Divide corridor into segments of Unit Width
4. Geometry: Offset — Offset each segment point outward by unit depth
5. Geometry: Polygon — Create unit boundary polygon from segment and offset points
6. BIM Elements: Walls — Create walls along polygon edges
7. BIM Elements: Door — Place door at corridor side of each unit
8. Output: Allplan Elements

Result

Adjusting the Unit Width slider regenerates the entire apartment layout — walls, doors, and unit boundaries all update. This enables rapid exploration of different unit configurations during schematic design.

Practical Example: Quantity Calculation

Scenario

Calculate total wall area and concrete volume for cost estimation.

Node Setup

1. Input: Allplan Selection — Select all walls in the project
2. Analysis: Wall Properties — Extract thickness and height from each wall
3. Math: Multiply — Length × Thickness × Height = Volume per wall
4. List: Sum — Sum all volumes for total concrete volume
5. Math: Multiply — Length × Height = Area per wall (for formwork)
6. List: Sum — Sum all areas for total formwork area
7. Output: Text — Display results as text in the Allplan model

Saving and Reusing Scripts

Saving a Script

1. In AVS, File > Save Script
2. Name: "Parametric Facade.avs"
3. The script is saved with the Allplan project

Loading a Script

1. In AVS, File > Load Script
2. Select the .avs file
3. The node graph loads with all connections preserved
4. Adjust sliders and re-run

Script Library

Build a library of reusable scripts for common tasks:

• Facade panel generation
• Parking layout generator
• Stair generator
• Site grading automation
• Quantity takeoff automation

Tips for Effective Visual Scripting

1. Start simple — build one node at a time and test after each addition
2. Use groups — group related nodes and label them for readability
3. Name your inputs — give sliders meaningful names (not "Slider 1")
4. Watch the data flow — use Watch nodes to inspect data at any point
5. Handle lists carefully — most nodes process lists automatically (map), but some require explicit list operations
6. Test with small data — verify with 3-5 items before scaling to hundreds
7. Document your logic — add text notes on the canvas explaining complex sections

Limitations

• AVS is less mature than Dynamo or Grasshopper — fewer community resources and packages
• Performance can be slow with large node graphs (>200 nodes)
• No Python integration (Dynamo has Python nodes for advanced logic)
• Limited external API access (cannot call web services or databases directly)
• No looping constructs — use Series and List operations instead

Wrapping Up

Allplan Visual Scripting isn't as powerful as Dynamo or Grasshopper, but it covers the essential use cases well. I use it for parametric facades, unit layout studies, and quantity extraction — tasks that would take hours manually but minutes with a script. My tip: build a library of reusable scripts for your common tasks. Once you've got a few scripts in your library, you'll find yourself reaching for them on every project.