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Procedural City Modeling

Procedural City Modeling. Implemented As A Blender Plug-In. Kevin Mullane. Supervisors: Kevin Glass Shaun Bangay Hannah Slay. Project Aims. Procedural Techniques for the Creation of Virtual Cities City Road Layout Templates Preliminary Building Generation. Overview.

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Procedural City Modeling

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  1. Procedural City Modeling Implemented As A Blender Plug-In Kevin Mullane Supervisors: Kevin Glass Shaun Bangay Hannah Slay

  2. Project Aims • Procedural Techniques for the Creation of Virtual Cities • City Road Layout Templates • Preliminary Building Generation

  3. Overview • Project Background • City Generation Process • Implementation Techniques • Road Layout Template Implementation • Generated City Results • Conclusions

  4. Project Background • Text-To-Scene System • Current project of the Virtual Reality Special Interest Group at Rhodes University • Aims to generate interactive 3D environments based on textual descriptions. • Blender Python API • Open Source 3D Modelling Package • Implements a Python Interface • Allows for Procedural Scene Generation

  5. City Generation Process • City Limits Delimitation • User Parameter • Defined By Landscape • Randomly Generated • Highway Network Generation • Raster / Checkered Layout • Branching Layout • Radial Layout • Suburb Region Extraction • Region Extraction Algorithm • Structure Heights

  6. City Generation Process • Road Network Generation • Region Subdivision • Regular Quads and Triangles • Roads and Intersections Extracted • Block Region Extraction • Region Extraction Algorithm • Blocks Resized • Building Extrusion • Quads Extruded Upwards • Height Within a Determined Range

  7. City Generation Process

  8. Implementation Techniques • Road Segment Generation • Region Extraction Algorithm • Regulated Subdivision

  9. Implementation TechniquesRoad Segment Generation • Ray Generation • Endpoint Generation • Legality Testing • Road Layout Evaluation • Best point is chosen New Road Segment is created Road intersection testing Endpoint proximity testing

  10. Implementation TechniquesRegion Extraction Algorithm • Initial Road Selection • Smallest Angle Selection • Record Road Traversal and Direction • Accumulate Interior Angles • Exterior Region Detection

  11. Implementation TechniquesRegulated Subdivision • Adjacent Edge Triangulation • Adjacent Triangle Evaluation • Shared Edge Removal • Quadrangle Subdivision • Triangle Subdivision • Further Quadrangle Creation

  12. Road Layout Templates • Raster / Checkered Layout • Restrict Road Generation Angle • Restrict Road Segment Lengths • Branching Layout • Wider Range of Generation Angles • Less Restriction on Segment Length • Radial / Circular Layout • Radial Roads • Circular Roads

  13. Generated City Results

  14. Generated City Results

  15. Generated City Results Layout: Circular / Radial Highway Segments: 23 Intersections: 280 Road Segments: 863 Buildings: 3519

  16. Generated City Results Layout: Checkered Highway Segments: 68 Intersections: 741 Road Segments: 2239 Buildings: 8959

  17. Conclusions • Procedural Techniques for the Creation of Virtual Cities • City Road Layout Templates • Preliminary Building Generation

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