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marchingcubes_3dtiles.html
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marchingcubes_3dtiles.html
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<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title></title></head><body>
<script type="module">
// #region IMPORTS
import Starter, { THREE } from './lib/starter.js';
import DynLineMesh from './lib/DynLineMesh.js';
import ShapePointsMesh from './lib/ShapePointsMesh.js';
import DynamicMesh from './lib/DynamicMesh.js';
import { UtilGltf2, Gltf2 } from './lib/UtilGltf2.js';
import { Ray, Bvh, nearPoint, from3JSScreenProjection }
from './bvh/index.js';
import MarchingCubesGrid from './mc/MarchingCubesGrid.js';
import TileDictionary from './mc/TileDictionary.js';
// #endregion
// #region MAIN
let App;
let Debug = {};
let Ref = {};
window.addEventListener( "load", async _=>{
App = new Starter( { webgl2:true, grid:true } );
App.setCamera( 30, 30, 10, [0,0.5,0] );
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
App.add( ( Debug.ln = new DynLineMesh() ) );
App.add( ( Debug.pnt = new ShapePointsMesh().disableDepth() ) );
Ref.dmesh = new DynamicMesh();
App.add( Ref.dmesh.mesh );
Ref.mat = new THREE.MeshPhongMaterial( { color:0x00ffff, flatShading:true } );
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Setup our Grid Data
const mc = new MarchingCubesGrid( [4,3,4], 1, true ); //[5,3,5]
Ref.mc = mc;
//Ref.mc.togglePointByIdx( 4 );
mcRenderPoints();
// Initialize all the cells with some userData
mc.cells.forEach( (v,i,ary)=>{ ary[i].userData = { bitValue:0, mesh:null }; });
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Setup what we need to do ray intersection on Grid Points
const bvh = new Bvh();
bvh.maxItemsPerNode = 20;
bvh.getItemPosition = ( data, idx )=>{ return data[ idx ].pos; };
bvh.setData( mc.points );
Ref.bvh = bvh;
// debugBVH();
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
const gltf = await Gltf2.fetch( './res/mc_tiles.gltf' );
Ref.dic = new TileDictionary();
tileLoading( gltf, Ref.dic );
mcRebuild();
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
App.render();
});
// #region BVH INTERSECTION
window.addEventListener( "pointerdown", e=>{
if( e.button != 2 ) return;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Compute the Ray and visually draw a line
const ray = from3JSScreenProjection( new Ray(), e.layerX, e.layerY, App );
ray.forAABB();
//Debug.ln.add( ray.posStart, ray.posEnd, 0x00ffff );
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ref.bvh.rayIntersect( ray, onIntersect );
} );
function onIntersect( ray, slice ){
const RNG = 0.2;
let min = Infinity;
let iMin = -1;
let t;
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
for( let i of slice ){
// Loop all the points in the slice & test which
// one is the closest to the ray
t = nearPoint( ray, Ref.bvh.data[ i ].pos, RNG );
if( t !== null && t < min ){
min = t;
iMin = i;
}
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Point interesected
if( iMin != -1 ){
Ref.mc.togglePointByIdx( iMin ); // Toggle it's state
mcRebuild(); // Rebuild Mesh
return true;
}
return false;
}
// #endregion
// #region BUILDING / RENDERING
function tileLoading( gltf, dic ){
const mCnt = gltf.json.meshes.length;
let m, geo, bits;
for( let i=0; i < mCnt; i++ ){
if( !gltf.json.meshes[ i ].name.startsWith( 'cliff' ) ) continue;
m = gltf.getMesh( i );
geo = UtilGltf2.primitiveGeo( m.primitives[ 0 ] );
bits = TileDictionary.parseBits( m.name );
dic.addUniqueTile( m.name, bits, geo );
}
}
function mcRebuild(){
Debug.ln.reset();
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
let bValue;
let tiles, tile, uTile;
let pos = [0,0,0];
for( let cell of Ref.mc.cells ){
// ------------------------------------
// If cell value hasn't changed, then skip
bValue = cell.getBitValue();
if( cell.userData.bitValue === bValue ) continue;
cell.userData.bitValue = bValue;
// ------------------------------------
// If setting empty space, then hide mesh
if( bValue === 0 || bValue === 255 ){
cell.userData.mesh.visible = false;
continue;
}
// ------------------------------------
// If tile doesn't exist, then hide any mesh with an error message.
tiles = Ref.dic.tiles[ bValue ];
if( !tiles ){
console.log( 'no tiles found for: ', bValue );
cell.userData.mesh.visible = false;
Debug.ln.box( cell.corners[0].pos, cell.corners[6].pos, 0xff0000 );
continue;
}
// ------------------------------------
// Generate mesh tile or replace geometry
tile = tiles[ 0 ];
uTile = Ref.dic.uniqueTiles[ tile.tileId ];
if( cell.userData.mesh ){
cell.userData.mesh.geometry = uTile.geo;
}else{
cell.userData.mesh = new THREE.Mesh( uTile.geo, Ref.mat );
cell.userData.mesh.position.fromArray( cell.getMidPos( pos ) );
cell.userData.mesh.scale.fromArray( [0.5,0.5,0.5] );
App.add( cell.userData.mesh );
}
cell.userData.mesh.visible = true;
cell.userData.mesh.quaternion.fromArray( tile.rotation );
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mcRenderPoints(); // ReRender MC Points
}
function mcRenderPoints(){
Debug.pnt.reset();
for( let p of Ref.mc.points ){
Debug.pnt.add( p.pos, (!p.enabled)?0x707070:0xffffff, 3 );
}
}
// #endregion
// #region DEBUGGING
function debugBVH(){
const bvh = Ref.bvh;
const color = [ 0x81D773, 0x6DA9EA, 0xF7716A, 0x00ff00, 0x00ffff, 0xffff00 ];
let n, c = 0;
for( let i=0; i < bvh.nodes.length; i++ ){
n = bvh.nodes[ i ];
if( n.isLeaf ){
Debug.ln.box( n.minBound, n.maxBound, color[c] );
for( let i=0; i < n.sliceLength; i++ ){
Debug.pnt.add( bvh.getItemPosition( bvh.data, bvh.partitioned[ i+n.sliceIndex ] ), color[c], 2 );
}
c++;
}else{
Debug.ln.box( n.minBound, n.maxBound, 0x707070 );
}
}
}
// #endregion
</script>
<div style="position:fixed; top:0px; left:0px; padding:5px; background-color:#ffffff20">
Right click to select or deselect a point on the grid.
</div>
</body></html>