Because checkCollisions didn’t work so well with every mesh in my scene, I opted to wrap the problematic ones with invisible cube meshes and use those instead.
To do that, I used the Inspector, or more specifically, its handy feature for recording and exporting delta files. I spawned the required number of cubes from the code, then went into the Inspector and painstakingly repositioned and resized them (and hid them and enabled checkCollisions). Once that was done, I downloaded the delta file and applied it:
private CreateColliders() {
// For more complex meshes, it's better to wrap them manually
// in a cube collider.
const colliderRoot = new TransformNode("colliders", this.scene);
for (let i = 0; i < 25; i++) {
const box = MeshBuilder.CreateBox(`collider_box_test${i}`, {
width: 1,
height: 1,
});
box.setParent(colliderRoot);
}
// This was added after the delta file was created in the Inspector.
const delta = JSON.parse(mallCollidersDelta);
SceneRecorder.ApplyDelta(delta, this.scene);
// For the simpler ones, enable collisions on them automatically.
for (let mesh of this.scene.meshes) {
if (COLLISION_MESHES.includes(mesh.name) || mesh.name == "door store")
mesh.checkCollisions = true;
}
}
This works. However, the generated delta file is massive: once formatted, it takes up over 500 lines. That seems like a lot for 15-30 cubes. I took a look, and indeed, it contains everything from my cameras, to my materials, multi-materials, etc.
{
"cameras": [
{
"rotation": [-0.1001121247834017, 3.14355046134856, 0],
"position": [0.35, 1.481, 56.8],
"maxZ": 15000,
"__state": { "id": "universal_camera" }
},
{
"ellipsoid": [0.3, 0.7, 0.3],
"checkCollisions": true,
"applyGravity": true,
"rotation": [-0.1001121247834017, 3.14355046134856, 0],
"position": [0.35, 1.481, 56.8],
"maxZ": 15000,
"cameraRigMode": 0,
"name": "universal_camera",
"id": "universal_camera",
"type": "UniversalCamera",
"__state": { "id": "universal_camera" }
},
{
"rotation": [-0.1001121247834017, 3.14355046134856, 0],
"position": [0.35, 1.481, 56.8],
"maxZ": 15000,
"name": "universal_camera",
"id": "universal_camera",
"type": "UniversalCamera",
"__state": { "id": "universal_camera" }
}
],
"materials": [
{
"useSpecularOverAlpha": true,
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"useSpecularOverAlpha": true,
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"useSpecularOverAlpha": true,
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"alpha": 1,
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"emissive": [0, 0, 0],
"id": "skyBox",
"name": "skyBox",
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"alpha": 1,
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"maxSimultaneousLights": 4,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"alpha": 1,
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"id": "skyBox",
"name": "skyBox",
"customType": "BABYLON.PBRMaterial",
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"emissive": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
},
{
"ambient": [0, 0, 0],
"disableLighting": true,
"twoSidedLighting": true,
"id": "skyBox",
"name": "skyBox",
"backFaceCulling": false,
"__state": { "id": "skyBox" }
}
],
"multiMaterials": [
{
"name": "Material #396",
"id": "5540373e-e13c-4b1a-8f23-394f84354917",
"__state": { "id": "5540373e-e13c-4b1a-8f23-394f84354917" }
},
{
"name": "Material #396",
"id": "5540373e-e13c-4b1a-8f23-394f84354917",
"materials": [
"b4198795-49e2-497f-b80a-1ecaae9a49bb",
"28ff8910-881a-4389-b81c-0dfd3b2330b4"
],
"__state": { "id": "5540373e-e13c-4b1a-8f23-394f84354917" }
},
{
"name": "Material #396",
"id": "5540373e-e13c-4b1a-8f23-394f84354917",
"materials": [
"b4198795-49e2-497f-b80a-1ecaae9a49bb",
"28ff8910-881a-4389-b81c-0dfd3b2330b4"
],
"__state": { "id": "5540373e-e13c-4b1a-8f23-394f84354917" }
}
],
"transformNodes": [
{
"position": [30, 0, 85],
"scaling": [2, 2, 2],
"name": "environment_model",
"id": "environment_model",
"__state": { "id": "environment_model" }
}
],
"meshes": [
{
"position": [39.8, 2.5, -8.87],
"scaling": [58, 5, 1],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test0" }
},
{
"position": [39.8, 2.5, 7.557],
"scaling": [58, 5, 1],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test1" }
},
{
"position": [-41.067, 0.409, -0.628],
"scaling": [4, 1, 1],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test2" }
},
{
"position": [0.4208763539791107, 0.40122804045677185, -37.224],
"scaling": [1, 1, 4],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test3" }
},
{
"position": [
0.41796523332595825, 0.40043574571609497, -45.741493225097656
],
"scaling": [1, 1, 4],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test4" }
},
{
"position": [69.373, 2.5, -0.65828537940979],
"scaling": [1, 5, 17],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test5" }
},
{
"position": [-68.28800964355469, 2.5, -0.6856837868690491],
"scaling": [1, 5, 15],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test6" }
},
{
"position": [0, 2.5, 63.9782829284668],
"scaling": [15, 5, 1],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test7" }
},
{
"position": [0.554198145866394, 2.5, -64.49107360839844],
"scaling": [15, 5, 1],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test8" }
},
{
"position": [0.6123590469360352, 0.9582553505897522, -0.6577818989753723],
"rotation": [0, 0.785398156308485, 0],
"scaling": [9.200000213440973, 2, 9.200000213440973],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test9" }
},
{
"position": [-39.50033187866211, 2.5, -8.869999885559082],
"scaling": [60, 5, 1],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test10" }
},
{
"position": [-39.10319519042969, 2.5, 7.557000160217285],
"scaling": [58, 5, 1],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test11" }
},
{
"position": [7.283, 2.5, 37.538],
"scaling": [1, 5, 53],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test12" }
},
{
"position": [-6.176000118255615, 2.5, 37.538],
"scaling": [1, 5, 52],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test13" }
},
{
"position": [7.283, 2.5, -38.366],
"scaling": [1, 5, 52],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test14" }
},
{
"position": [-6.176000118255615, 2.5, -38.366],
"scaling": [1, 5, 52.5],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test15" }
},
{
"position": [-8.231, 2.5, 9.646653175354004],
"rotation": [0, 0.7853981439639591, 0],
"scaling": [0.999999982885729, 5, 6.2999999849031685],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test16" }
},
{
"position": [9.139408111572266, 2.5, -10.722980499267578],
"rotation": [0, 0.785398156308485, 0],
"scaling": [0.999999982885729, 5, 5.699999809725588],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test17" }
},
{
"position": [9.125628471374512, 2.5, 9.35754108428955],
"rotation": [0, 0.7928117710287251, 0],
"scaling": [5.64, 5, 0.9999998995619691],
"checkCollisions": true,
"__state": { "id": "collider_box_test18" }
},
{
"position": [-7.980129241943359, 2.5, -10.563694953918457],
"rotation": [0, 0.7714355311311498, 0],
"scaling": [5.530000058505466, 5, 1.0000000577398893],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test19" }
},
{
"position": [40.677, 0.4090000092983246, -0.1725575029850006],
"scaling": [4, 1, 1],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test20" }
},
{
"position": [49.25578308105469, 0.4013468325138092, -0.17464542388916016],
"scaling": [4, 1, 1],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test21" }
},
{
"position": [0.6950069069862366, 0.40078896284103394, 32.436],
"scaling": [1, 1, 4],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test22" }
},
{
"position": [0.687580406665802, 0.40305960178375244, 40.92949295043945],
"scaling": [1, 1, 4],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test23" }
},
{
"position": [-32.576, 0.40457624197006226, -0.6409369707107544],
"scaling": [4, 1, 1],
"visibility": 0,
"checkCollisions": true,
"__state": { "id": "collider_box_test24" }
},
{
"position": [0, 0.39349600021435605, 0],
"__state": { "id": "torusTeleportation" }
},
{
"instances": [
{
"name": "Box230",
"id": "3ea20fcc-0981-4159-985a-cb9b50d8a51d",
"isEnabled": true,
"isVisible": true,
"isPickable": false,
"checkCollisions": false,
"position": [0, -1.49, 0],
"scaling": [1, 1, 1],
"parentId": "c45c690f-0fd8-45fc-b436-97e4a80bd937",
"rotationQuaternion": [0, 0, 0, 1],
"animations": [],
"ranges": []
},
{
"name": "Box296",
"id": "4b4bb50a-0d0c-491b-99ed-ecc25b8d7322",
"isEnabled": true,
"isVisible": true,
"isPickable": false,
"checkCollisions": false,
"position": [
9.2482004276917e-8, -1.4900000095367432, -0.012250441126525402
],
"scaling": [1, 1, 1],
"parentId": "69dcad66-3917-4062-a632-31edebe3f92a",
"rotationQuaternion": [0, -9.002270229176851e-14, 0, 1],
"animations": [],
"ranges": []
},
{
"name": "Box263",
"id": "a704ccd9-248b-4003-9807-d995a2bf8504",
"isEnabled": true,
"isVisible": true,
"isPickable": false,
"checkCollisions": false,
"position": [0, -1.49, 0],
"scaling": [1, 1, 1],
"parentId": "5cb7cf84-5056-4257-9eb6-00b722910635",
"rotationQuaternion": [0, 0, 0, 1],
"animations": [],
"ranges": []
}
],
"__state": { "id": "2417b790-b762-455a-936e-50cf8f6774ec" }
},
{
"position": [-10.912723541259766, 0, -36.88462448120117],
"__state": { "id": "769667f2-640e-498b-9fd5-9edd8662ffe7" }
}
]
}
Indeed, it seems like it contains data for the entire scene. Unfortunately, it also overrides the transform of the camera—which I used to fly around in the scene to see where to put the cube colliders—so I removed that section from the file. It appears to work fine regardless, raising the question: does it need to describe the whole scene?
If not, is it safe to remove all the unnecessary data (i.e. everything but the transforms of the collider cubes)? And, do I need to keep the code that initially spawns those cubes, or does the delta file make that redundant?
