No gaps: seams, openings and transparent parts

A build looks broken long before it looks ugly. Most "broken" comes from gaps.

No gaps, ever

Windows, doors, frames, sills and trim must touch what they meet. A hairline gap between a jamb and its wall, or a sill floating 0.1 off the wall, reads as broken, not as detail.

The door test

An opening is finished only when no sight line escapes it:

• the frame fills the opening on all four sides (head, both jambs, threshold or sill);
• every frame member overlaps about 0.1 into the wall around it;
• the leaf or pane sits inside the frame, not floating in the hole.

A door is a framed panel, not a bare pane

Give each leaf side stiles (0.4 to 0.5), a top rail, a chunky bottom rail (1 to 1.5), a mid rail at handle height, and glass or panel insets embedded 0.2 into the rails. A flat slab with a handle reads as a placeholder.

Clipping: a bug between things, a technique inside a model

• Inside one model, parts may interpenetrate to build its form: canopy tiers sinking into each other, rock slabs clipped together, path segments chained into one path.
• Between things, never. Windows and doors own their wall space: build the wall in strips around the opening or negate it out, then fit the frame in. Never stamp a window through an unbroken wall.

Transparent parts: one layer, buried edges

Transparency double-punishes sloppy seams. Any gap behind a transparent part glows through it, and stacked transparent slabs sort against each other and shimmer. Use one transparent layer and bury its edges into the frame.

Wedges flatten junctions

When two parts of different heights meet and the step isn't a deliberate feature, cap the junction with a WedgePart so it ramps instead of jumping.

Hanging lines stay connected

Cables, ropes and chains are a chain of segments along a sagging curve, with each end embedded about 0.2 into the thing it hangs from. A wire that stops short of its pole is the most visible gap on any map.