[NaySurGithub]

Problem

On The Hive hub, the hivehub:logo entity (the big "HIVE" title) renders as a solid black / dark box instead of the green letters. Once that is fixed, dark slivers still stick out past the letters on one side.

Before	After

The "before, at an angle" shot already includes the first two fixes below: the slivers on the right are the third bug.

All shots come from Perlin's offline preview with the server's resource pack mounted (PERLIN_TEST_SERVER_PACKS, PERLIN_PREVIEW_ENTITIES=hivehub/logo).

How the pack builds the logo

• entity/hive/hub/logo.json: material entity_alphatest_one_sided, texture textures/entity/hive/hub/logo (a 127×36 palette PNG);
• render_controllers/hive/hub/logo.json: "ignore_lighting": true, "light_color_multiplier": 1.0;
• models/entity/hive/hub/logo.json: the H / I / V / E letters, plus a border bone. That bone is a box of six zero-thickness planes around the letters, each with one face, all facing inward: south at z = -7, north at z = 17, up at y = -1, down at y = 38, west at x = -64, east at x = 65. Seen from outside, only the far walls show, as a dark frame behind the letters.

Causes and fixes

1. ignore_lighting was not read (black logo).

• EntityAssets now parses ignore_lighting and light_color_multiplier.
• Layers whose controller ignores lighting use full brightness (scaled by the multiplier) and block/sky light 15, as fullbright already did.

2. Entities were always drawn with face culling off (the front background plane covered the logo).

• UiDraw::cull now follows the entity material: materials without DisableCulling cull back faces.
• The world matrix mirrors model z (determinant −1/4096 for every world entity), so the culled side is swapped when the determinant is negative.

3. A lone east or west face was built on the wrong side (slivers past the letters).

• Bedrock geometry is mirrored in x relative to the face names: Blockbench exports origin.x = -(from.x + size.x) and keeps the face names. In geometry space, east is therefore the −x side and west the +x side.
• Geometry.cpp already undoes this for entity cubes by taking a side's UV from the opposite face (fi = 1 - i). But it checked face presence with the unswapped index c.faces[i].present. A cube listing only east (or only west) got its single quad on the opposite side, facing outward. Both side walls of the logo's box then faced the viewer as dark slivers.
• The presence check now uses fi. Box-UV cubes are unaffected, since they always have all six faces.

Culling now applies to every entity with a one-sided material, not only pack entities. Vanilla mobs using entity (cow, pig, creeper, …) were checked up close:

Testing

• macOS arm64 Release build, rebased on main (653959d).
• Offline preview with the Hive pack, front and at an angle: green letters in a uniform dark frame, no slivers (shots above).
• Offline preview of vanilla mobs with one-sided materials: faces correct, no inside-out models.
• Not done yet: a live check on the Hive hub, and resource packs with unusual one-sided models.