The terrain moves in: pits open downward, hedges stand waist-high, ooze is jello

The flat token billboards give way to terrain that inhabits the room.
Pits, slime, tacks, and the dimensional warp's rings are painted INTO
the flagstones — the home-tile decal pass grows into a general per-cell
overlay grid, one texture per cell, alpha-blended texel by texel. Thorn
and rose hedges fill their square wall to wall at half height, drawn
with a near-bias so the wizard standing among the thorns peeks over the
top. The killer ooze rises as a full translucent cube of jello, bricks
and bodies visible through it; dust billows; and each dimensional warp
mouth throws an additive pillar of violet light up from its floor ring.
Billboards learn aspect, translucency, glow, and draw-order bias to
carry it all.

Nine paintable starters ship — four floor decals under textures/, five
standing volumes under terrain3d/ (spec updated for the artist, hedges
wide, jello solid, warpglow as light) — shown in the token workshop,
rehearsable in place with /?fpv&terrain=thornbush@3,7;jello@4,7.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/web/src/fpv/FpvWorkshop.svelte

@@ -27,6 +27,15 @@
     view.knownIllusionEdges.push(k);
     delete view.board.edges[k];
   }
+  // ?terrain=pit@3,7;thornbush@4,7 — furnish squares for the renderer
+  // (and the artist) to rehearse. dimwarp@x,y opens a floor mouth.
+  for (const spec of (q.get("terrain") ?? "").split(";").filter(Boolean)) {
+    const [kind, at] = spec.split("@") as [string, string?];
+    const [tx, ty] = (at ?? "").split(",").map(Number);
+    if (!Number.isFinite(tx) || !Number.isFinite(ty)) continue;
+    if (kind === "dimwarp") view.dimWarps.push({ a: { x: tx!, y: ty! }, b: { x: tx!, y: ty! } });
+    else view.squareContents[`${tx},${ty}`] = { kind } as (typeof view.squareContents)[string];
+  }
   const start = view.players.find((p) => p.id === povId)!.position;
 
   // ?x=&y=&dir= override the spawn — for standing the camera anywhere.