Function buildBlockGeometry

src/mesher.js:377–416

(id)

/** Unit cube (or cross) centered at origin with baked face shading. */
export function buildBlockGeometry(id) {
  const def = BLOCKS[id];
  const buf = new GeoBuf();
  if (def.shape === 'cross') {
    const rect = uvRect(def.tex.py);
    const a = -0.35, b = 0.35;
    for (const [[x0, z0], [x1, z1]] of [[[a, a], [b, b]], [[a, b], [b, a]]]) {
      for (const flip of [false, true]) {
        const corners = [
          { x: x0, z: z0, u: 0, vy: 0 },
          { x: x1, z: z1, u: 1, vy: 0 },
          { x: x1, z: z1, u: 1, vy: 1 },
          { x: x0, z: z0, u: 0, vy: 1 },
        ];
        const list = flip ? [...corners].reverse() : corners;
        buf.quad(list.map((c) => ({
          x: c.x, y: c.vy - 0.5, z: c.z,
          u: rect.u0 + (rect.u1 - rect.u0) * c.u,
          v: rect.v0 + (rect.v1 - rect.v0) * c.vy,
          r: 1, g: 0,
        })));
      }
    }
  } else {
    for (const face of FACES) {
      const tile = def.tex[face.key];
      const rect = uvRect(tile === 'water_still' ? 'water_still' : tile);
      const shade = FACE_SHADE[face.key];
      buf.quad(face.corners.map((c) => ({
        x: c.pos[0] - 0.5, y: c.pos[1] - 0.5, z: c.pos[2] - 0.5,
        u: rect.u0 + (rect.u1 - rect.u0) * c.u,
        v: rect.v0 + (rect.v1 - rect.v0) * c.v,
        r: shade, g: 0,
      })));
    }
  }
  const g = buf.build();
  g.computeBoundingSphere();
  return g;
}