How to use @babylonjs/core - 10 common examples

import { Engine } from "@babylonjs/core/Engines/engine";
import { Scene } from "@babylonjs/core/scene";
import { Vector3 } from "@babylonjs/core/Maths/math.vector";
import { FreeCamera } from "@babylonjs/core/Cameras/freeCamera";
import { HemisphericLight } from "@babylonjs/core/Lights/hemisphericLight";
import { Mesh } from "@babylonjs/core/Meshes/mesh";

import "@babylonjs/core/Materials/standardMaterial";
import "@babylonjs/core/Meshes/Builders/boxBuilder";
import "@babylonjs/core/Meshes/Builders/sphereBuilder";

const canvas = document.getElementById("renderCanvas") as HTMLCanvasElement;
const engine = new Engine(canvas);
var scene = new Scene(engine);

// This creates and positions a free camera (non-mesh)
var camera = new FreeCamera("camera1", new Vector3(0, 5, -10), scene);

// This targets the camera to scene origin
camera.setTarget(Vector3.Zero());

// This attaches the camera to the canvas
camera.attachControl(canvas, true);

// This creates a light, aiming 0,1,0 - to the sky (non-mesh)
var light = new HemisphericLight("light1", new Vector3(0, 1, 0), scene);

// Default intensity is 1. Let's dim the light a small amount
light.intensity = 0.7;

import { Engine } from "@babylonjs/core/Engines/engine";
import { Scene } from "@babylonjs/core/scene";
import { Vector3 } from "@babylonjs/core/Maths/math.vector";
import { FreeCamera } from "@babylonjs/core/Cameras/freeCamera";
import { HemisphericLight } from "@babylonjs/core/Lights/hemisphericLight";
import { Mesh } from "@babylonjs/core/Meshes/mesh";

import { GridMaterial } from "@babylonjs/materials/grid/gridMaterial";

import "@babylonjs/core/Meshes/Builders/boxBuilder";
import "@babylonjs/core/Meshes/Builders/sphereBuilder";

const canvas = document.getElementById("renderCanvas") as HTMLCanvasElement;
const engine = new Engine(canvas);
var scene = new Scene(engine);

// This creates and positions a free camera (non-mesh)
var camera = new FreeCamera("camera1", new Vector3(0, 5, -10), scene);

// This targets the camera to scene origin
camera.setTarget(Vector3.Zero());

// This attaches the camera to the canvas
camera.attachControl(canvas, true);

// This creates a light, aiming 0,1,0 - to the sky (non-mesh)
var light = new HemisphericLight("light1", new Vector3(0, 1, 0), scene);

// Default intensity is 1. Let's dim the light a small amount
light.intensity = 0.7;

import { Engine } from "@babylonjs/core/Engines/engine";
import { Scene } from "@babylonjs/core/scene";
import { Vector3 } from "@babylonjs/core/Maths/math.vector";
import { FreeCamera } from "@babylonjs/core/Cameras/freeCamera";
import { HemisphericLight } from "@babylonjs/core/Lights/hemisphericLight";
import { Mesh } from "@babylonjs/core/Meshes/mesh";

import { GridMaterial } from "@babylonjs/materials/grid/gridMaterial";

import "@babylonjs/core/Meshes/Builders/boxBuilder";
import "@babylonjs/core/Meshes/Builders/sphereBuilder";

const canvas = document.getElementById("renderCanvas") as HTMLCanvasElement;
const engine = new Engine(canvas);
var scene = new Scene(engine);

// This creates and positions a free camera (non-mesh)
var camera = new FreeCamera("camera1", new Vector3(0, 5, -10), scene);

// This targets the camera to scene origin
camera.setTarget(Vector3.Zero());

// This attaches the camera to the canvas
camera.attachControl(canvas, true);

// This creates a light, aiming 0,1,0 - to the sky (non-mesh)
var light = new HemisphericLight("light1", new Vector3(0, 1, 0), scene);

// Default intensity is 1. Let's dim the light a small amount
light.intensity = 0.7;

import { Engine } from "@babylonjs/core/Engines/engine";
import { Scene } from "@babylonjs/core/scene";
import { Vector3 } from "@babylonjs/core/Maths/math.vector";
import { FreeCamera } from "@babylonjs/core/Cameras/freeCamera";
import { HemisphericLight } from "@babylonjs/core/Lights/hemisphericLight";
import { Mesh } from "@babylonjs/core/Meshes/mesh";

import "@babylonjs/core/Materials/standardMaterial";
import "@babylonjs/core/Meshes/Builders/boxBuilder";
import "@babylonjs/core/Meshes/Builders/sphereBuilder";

const canvas = document.getElementById("renderCanvas") as HTMLCanvasElement;
const engine = new Engine(canvas);
var scene = new Scene(engine);

// This creates and positions a free camera (non-mesh)
var camera = new FreeCamera("camera1", new Vector3(0, 5, -10), scene);

// This targets the camera to scene origin
camera.setTarget(Vector3.Zero());

// This attaches the camera to the canvas
camera.attachControl(canvas, true);

// This creates a light, aiming 0,1,0 - to the sky (non-mesh)
var light = new HemisphericLight("light1", new Vector3(0, 1, 0), scene);

// Default intensity is 1. Let's dim the light a small amount
light.intensity = 0.7;

import { Scene } from "@babylonjs/core/scene";
import { Vector3 } from "@babylonjs/core/Maths/math.vector";
import { FreeCamera } from "@babylonjs/core/Cameras/freeCamera";
import { HemisphericLight } from "@babylonjs/core/Lights/hemisphericLight";
import { Mesh } from "@babylonjs/core/Meshes/mesh";

import "@babylonjs/core/Materials/standardMaterial";
import "@babylonjs/core/Meshes/Builders/boxBuilder";
import "@babylonjs/core/Meshes/Builders/sphereBuilder";

const canvas = document.getElementById("renderCanvas") as HTMLCanvasElement;
const engine = new Engine(canvas);
var scene = new Scene(engine);

// This creates and positions a free camera (non-mesh)
var camera = new FreeCamera("camera1", new Vector3(0, 5, -10), scene);

// This targets the camera to scene origin
camera.setTarget(Vector3.Zero());

// This attaches the camera to the canvas
camera.attachControl(canvas, true);

// This creates a light, aiming 0,1,0 - to the sky (non-mesh)
var light = new HemisphericLight("light1", new Vector3(0, 1, 0), scene);

// Default intensity is 1. Let's dim the light a small amount
light.intensity = 0.7;

// Our built-in 'sphere' shape. Params: name, subdivs, size, scene
var sphere = Mesh.CreateSphere("sphere1", 16, 2, scene);

import { Vector3 } from "@babylonjs/core/Maths/math.vector";
import { FreeCamera } from "@babylonjs/core/Cameras/freeCamera";
import { HemisphericLight } from "@babylonjs/core/Lights/hemisphericLight";
import { Mesh } from "@babylonjs/core/Meshes/mesh";

import { GridMaterial } from "@babylonjs/materials/grid/gridMaterial";

import "@babylonjs/core/Meshes/Builders/boxBuilder";
import "@babylonjs/core/Meshes/Builders/sphereBuilder";

const canvas = document.getElementById("renderCanvas") as HTMLCanvasElement;
const engine = new Engine(canvas);
var scene = new Scene(engine);

// This creates and positions a free camera (non-mesh)
var camera = new FreeCamera("camera1", new Vector3(0, 5, -10), scene);

// This targets the camera to scene origin
camera.setTarget(Vector3.Zero());

// This attaches the camera to the canvas
camera.attachControl(canvas, true);

// This creates a light, aiming 0,1,0 - to the sky (non-mesh)
var light = new HemisphericLight("light1", new Vector3(0, 1, 0), scene);

// Default intensity is 1. Let's dim the light a small amount
light.intensity = 0.7;

// Our built-in 'sphere' shape. Params: name, subdivs, size, scene
var sphere = Mesh.CreateSphere("sphere1", 16, 2, scene);

const canvas = document.getElementById("renderCanvas") as HTMLCanvasElement;
const engine = new Engine(canvas);
var scene = new Scene(engine);

// This creates and positions a free camera (non-mesh)
var camera = new FreeCamera("camera1", new Vector3(0, 5, -10), scene);

// This targets the camera to scene origin
camera.setTarget(Vector3.Zero());

// This attaches the camera to the canvas
camera.attachControl(canvas, true);

// This creates a light, aiming 0,1,0 - to the sky (non-mesh)
var light = new HemisphericLight("light1", new Vector3(0, 1, 0), scene);

// Default intensity is 1. Let's dim the light a small amount
light.intensity = 0.7;

// Our built-in 'sphere' shape. Params: name, subdivs, size, scene
var sphere = Mesh.CreateSphere("sphere1", 16, 2, scene);

// Move the sphere upward 1/2 its height
sphere.position.y = 2;

// Our built-in 'ground' shape. Params: name, width, depth, subdivs, scene
var ground = Mesh.CreateGround("ground1", 6, 6, 2, scene);
ground.material = new GridMaterial("", scene);
sphere.material = new GridMaterial("", scene);

engine.runRenderLoop(() => {

const canvas = document.getElementById("renderCanvas") as HTMLCanvasElement;
const engine = new Engine(canvas);
var scene = new Scene(engine);

// This creates and positions a free camera (non-mesh)
var camera = new FreeCamera("camera1", new Vector3(0, 5, -10), scene);

// This targets the camera to scene origin
camera.setTarget(Vector3.Zero());

// This attaches the camera to the canvas
camera.attachControl(canvas, true);

// This creates a light, aiming 0,1,0 - to the sky (non-mesh)
var light = new HemisphericLight("light1", new Vector3(0, 1, 0), scene);

// Default intensity is 1. Let's dim the light a small amount
light.intensity = 0.7;

// Our built-in 'sphere' shape. Params: name, subdivs, size, scene
var sphere = Mesh.CreateSphere("sphere1", 16, 2, scene);

// Move the sphere upward 1/2 its height
sphere.position.y = 2;

// Our built-in 'ground' shape. Params: name, width, depth, subdivs, scene
var ground = Mesh.CreateGround("ground1", 6, 6, 2, scene);

engine.runRenderLoop(() => {
    scene.render();
});

function onControlAdded (button3d) {
  if (button3d.hostInstance && button3d.hostInstance.mesh && button3d.hostInstance.mesh.material) {
    // the material is only available after attaching to BabylonJS host (3D GUI)
    const material = button3d.hostInstance.mesh.material

    material.diffuseColor = Color3.Black()

    button3d.hostInstance.pointerEnterAnimation = () => {
      material.emissiveColor = Color3.FromInts(15, 15, 15)
    }

    button3d.hostInstance.pointerOutAnimation = () => {
      material.emissiveColor = Color3.Black()
    }
  } else {
    console.error('onControlAdded(): no host instance -> mesh -> material', button3d)
  }
}

onMount(instance: CreatedInstance): void {
    this.addControls(instance)

    if (instance.customProps.createForParentMesh) {
      // console.log('for parent mesh', instance.parent ? instance.parent.babylonJsObject : 'error: no parent object')

      let mesh: Mesh = instance.parent!.hostInstance // should crawl parent hierarchy for a mesh
      // console.error('we will be attaching the mesh:', mesh.name, mesh);

      const material = new StandardMaterial("AdvancedDynamicTextureMaterial", mesh.getScene())
      material.backFaceCulling = false
      material.diffuseColor = Color3.Black()
      material.specularColor = Color3.Black()

      if(instance.hostInstance === undefined) {
        console.error('missing instance')
      } else {
        if (this.props.hasAlpha) {
          material.diffuseTexture = instance.hostInstance
          material.emissiveTexture = instance.hostInstance
          instance.hostInstance.hasAlpha = true
        } else {
          material.emissiveTexture = instance.hostInstance
          material.opacityTexture = instance.hostInstance
        }
      }

      mesh.material = material