Skyboxes

protocols/schemas/shapes.prs

@@ -2,7 +2,7 @@ version 1 .
 
 Sprite = <sprite @name string @shape Shape> .
 
-Shape = Mesh / Light / Scale / Move / Rotate / @many [Shape ...] / Texture / Color / Name / Floor / Nonphysical / Touchable / CSG .
+Shape = Mesh / Light / Scale / Move / Rotate / @many [Shape ...] / Texture / Color / Name / Floor / Nonphysical / Touchable / CSG / Skybox .
 
 Mesh = Sphere / Box / Ground / Plane .
 
@@ -48,3 +48,5 @@ CSGExpr =
 / <intersect @shapes [CSGExpr ...]>
 / <invert @shape CSGExpr>
 .
+
+Skybox = <skybox @path string> .

scene/lobby.pr

@@ -1,5 +1,6 @@
 <sprite "light" <hemispheric-light <v 0.1 1.0 0.0>>>
 <gravity <v 0.0 -9.81 0.0>>
+<sprite "sky" <skybox "textures/Daylight Box UV_0">>
 
 <sprite "ground"
  <texture ["textures/grass-256x256.jpg"
@@ -24,7 +25,7 @@
 
 <Exit "p" "lobby">
 <sprite "p"
- <move <v -1000.0 2.0 3.0>
+ <move <v -999.5 2.0 3.0>
   <rotate <v 0.0 -0.25 0.0>
    <color 1.0 0.0 1.0
     <touchable <scale <v 1.0 2.0 1.0> <plane>>>>>>>

scene/other.pr

@@ -1,13 +1,14 @@
 <sprite "light" <hemispheric-light <v 0.1 1.0 0.0>>>
-<gravity <v 0.0 -9.81 0.0>>
+;<gravity <v 0.0 -9.81 0.0>>
+<sprite "sky" <skybox "textures/eso0932a">>
 
-<sprite "ground2"
- <texture ["textures/oak-herringbone-5e80fb40b00c9-1200.jpg"
-           <v 100.0 100.0>
-           <v 0.0 0.0>]
-  <floor <ground <v 300.0 300.0>>>>>
+; <sprite "ground2"
+;  <texture ["textures/oak-herringbone-5e80fb40b00c9-1200.jpg"
+;            <v 100.0 100.0>
+;            <v 0.0 0.0>]
+;   <floor <ground <v 300.0 300.0>>>>>
 
-<Exit "home" "lobby" <v -2.5 1.6 0.5>>
+<Exit "home" "lobby" <v -2.5 0.0 0.5>>
 <sprite "home"
  <move <v 0.0 0.0 -2.0>
   <rotate <v 0.0 -0.5 0.0> [

src/shapes.ts

@@ -1,5 +1,6 @@
 import {
     Color3,
+    CubeTexture,
     CSG,
     HemisphericLight,
     Material,
@@ -309,6 +310,19 @@ export function build(name: string, scene: Scene, shape: Shapes.Shape, customize
             throw new Error("unimplemented");
         }
 
+        case "Skybox": {
+            const t = new ShapeTree<Mesh>(scene, shape, MeshBuilder.CreateBox(name, { size: 2000 }, scene));
+            const mat = new StandardMaterial(name, scene);
+            mat.backFaceCulling = false;
+            mat.reflectionTexture = new CubeTexture(shape.value.path, scene);
+            mat.reflectionTexture.coordinatesMode = Texture.SKYBOX_MODE;
+            mat.diffuseColor = new Color3(0, 0, 0);
+            mat.specularColor = new Color3(0, 0, 0);
+            t.node.material = mat;
+            applyCustomizer(t, customize);
+            return t;
+        }
+
         default:
             ((_shape: never) => {
                 console.error('Unsupported shape variant', shape);

textures/README.md

@@ -1 +1,3 @@
 door1.jpg: based on https://commons.wikimedia.org/wiki/File:Simple_door_inside_the_BCR_Headquarters_Building,_in_Bucharest_%28Romania%29.jpg, CC-SA 4.0
+Daylight Box UV_0.png and extracted jpgs: from https://opengameart.org/content/sky-box-sunny-day, "Copyright/Attribution Notice: KIIRA" (?)
+eso0932a.jpg: https://www.eso.org/public/images/eso0932a/

textures/cut_skybox.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+inputfile="$1"
+if [ -z "$inputfile" ]
+then
+    echo 'Usage: cut_skybox.sh INPUTFILENAME' >&2
+    exit 1
+fi
+
+convert -extract 512x512+0+512 "$inputfile" "$(basename "$(basename "$inputfile" .png)" .jpg)_nx.jpg"
+convert -extract 512x512+512+512 "$inputfile" "$(basename "$(basename "$inputfile" .png)" .jpg)_pz.jpg"
+convert -extract 512x512+1024+512 "$inputfile" "$(basename "$(basename "$inputfile" .png)" .jpg)_px.jpg"
+convert -extract 512x512+1536+512 "$inputfile" "$(basename "$(basename "$inputfile" .png)" .jpg)_nz.jpg"
+
+convert -extract 512x512+512+0 "$inputfile" "$(basename "$(basename "$inputfile" .png)" .jpg)_py.jpg"
+convert -extract 512x512+512+1024 "$inputfile" "$(basename "$(basename "$inputfile" .png)" .jpg)_ny.jpg"