How does the sketch actually steer the engine?
Two ways. The spine you draw becomes the boulevard's real centreline: the street grid grows as offset rows and cross streets from that curve, so bending the line reshapes every block. Pins are hard constraints: the nearest block adopts the nominated use, and the engine assigns everything else (towers, mid-rise, housing, centre, parks) around them. The site and your sketch are never overridden, even by the auto-fixer.
Which rules is the masterplan checked against?
An indicative distillation of Victorian planning and urban design guidance: open space provision and the 400 m walk rule (Clause 53.01, Plan Melbourne's 20-minute neighbourhoods), walkable block lengths and connectivity (Clause 56), tower separation and overshadowing of parks (Better Apartments-style standards), boulevard enclosure and active frontage (Urban Design Guidelines for Victoria), education and health triggers, integrated water management and street canopy. Every check cites its source and explains its fix. Client deployments encode the full controls for the actual site.
What outputs does a feasibility run produce?
A 3D precinct model; seven 2D masterplan layers (land use, figure ground, movement and public transport, green and water, in-ground services, walkability, compliance); typical street cross-sections for the boulevard, connector, local and park-edge streets showing tram, in-ground services at their standard depths, canopy shading and the real building context either side; land use, yield and infrastructure schedules; and a PDF feasibility pack with the plan, register and sections.
What does the auto-fixer change, and what does it leave alone?
It searches the brief's design-controllable parameters (open space target, block dimensions, typology shares, storey caps, tram stop spacing, community uses) for the closest scheme that clears more criteria, and reports every change with the before-and-after score. The site, your sketched spine and your pins stay fixed because they are constraints, not design decisions; anything it cannot clear is listed as needing a site or policy trade-off.
Is this meant to replace urban designers or planners?
No, it is an educational demonstration of GIRIH X technology. Its value is speed at feasibility: developers and agencies can test dozens of structure, density and open-space options in minutes with a live compliance readout, then take the shortlist into masterplanning with their consultants. In client work the same engine runs on the real cadastre with the applicable planning scheme, and results land in Revit, GIS or the client's own platform.