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Boregate builds complete tunnel entrances right inside Blender: modern concrete road portals with splayed wing walls and walkways, bevelled mountain hoods, avalanche galleries, cut-and-cover boxes, Victorian stone and brick railway portals, castellated follies, canal and footpath tunnels, rock-cut openings and timber-framed mine adits with rails and an ore cart.

Pick one of 45 designs and change anything: the portal, the hillside and the first stretch of tunnel rebuild live in a fraction of a second. Every portal sits in its own sloped cutting on a living hillside with game-ready trees, grass, ferns, boulders and loose stones, the road or track runs into a short lit tunnel, and the far end fades to darkness or opens to daylight. All parts are built in real meters with bevelled edges and photoreal PBR materials made from scanned Poly Haven textures, so it looks right in Cycles and EEVEE and exports cleanly to game engines.

One click, a new tunnel
Press Surprise for a fresh random portal or pick a design from the picture gallery. Everything happens in the sidebar.

45 tunnel portals
Concrete road portals, mountain hoods, avalanche galleries, Victorian railway masonry, castellated follies and timber mine adits.

Any opening
One stone portal morphing through round, horseshoe, elliptical, pointed and box openings, single to twin bores.

Real materials
Concrete, sandstone, granite, rubble and brick faces with grime streaks, soot over the arch and moss on the ledges.

Features

• 45 designs in five families: road, mountain, railway, heritage and mine
• Nine structure types: concrete headwall, bevelled hood, cut and cover, stone masonry, brick, castellated, rock cut, mine adit and avalanche gallery
• Round, horseshoe, segmental, elliptical, pointed, box and timber-set openings, single, twin or multi-cell
• Straight, splayed or stepped wing walls, parapets with solid walls, railings or battlements, voussoir rings, keystones, cornices and pilasters
• Roads with lane markings, kerbs and walkways, railway track on ballast with sleepers, mine track with an ore cart, or footpaths
• Tunnel lights in LED, sodium or warm white, jet fans, cable trays, lanterns, floodlights, emergency niches, SOS signs, lane and rail signals, height signs and your own tunnel name
• Concrete, panel concrete, sandstone ashlar, granite, rubble, slate, red and yellow brick, with grime streaks, soot over the arch and moss on ledges
• Hillsides in grass, dry dirt, rock or alpine ground, blended on steep slopes
• Game-ready trees (spruce, fir, pine, beech, birch), shrubs, grass tufts and ferns from scanned leaf textures, plus boulders and scree, all on by default with simple count sliders
• Surprise, Vary and Finish buttons that always give a good result, a picture gallery in the sidebar and a Shift+A menu
• Editing one portal never changes another, even after Shift+D or Alt+D
• Game-ready: named parts and materials in their own collection, three detail levels, Make LODs and Convert to Mesh
• Works in Cycles and EEVEE

Requires Blender 4.2 or newer. Tested on Blender 4.2, 4.5 and 5.2 LTS.