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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>whether_point_in_3d_model</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style type="text/css">
html,body{margin:0;width: 100%;height: 100%;}
</style>
</head>
<body>
<script src="./three.min.js"></script>
<script src="./OrbitControls.js"></script>
<script>
"use strict";
var renderer, scene, camera, stats;
var particles, uniforms ,buffer_geometry, mesh;
var sphere_geometry,sphere_mesh,sphere_material;
var raycaster, intersects;
var mouse, INTERSECTED;
{ // init
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.set(30,30,30)
let orth_size=60;
let orth={};
orth.left=window.innerWidth / - orth_size;
orth.right=window.innerWidth / orth_size;
orth.top=window.innerHeight / orth_size;
orth.bottom=window.innerHeight / - orth_size;
var orth_camera = new THREE.OrthographicCamera( orth.left, orth.right, orth.top, orth.bottom, - 500, 1000 );
orth_camera.position.z=300;
var camera_rendering=camera;
// var camera_rendering=orth_camera;
{ // mesh
// var geometry = new THREE.TorusBufferGeometry( 6, 3, 16, 16 );
var geometry = new THREE.TorusKnotBufferGeometry( 4, 1, 100, 16 );
geometry.rotateX(Math.PI/2)
var material = new THREE.MeshBasicMaterial( { color: 0xffff00,
side:THREE.DoubleSide,
} );
mesh = new THREE.Mesh( geometry, material );
// scene.add( mesh );
var geo_wireframe = new THREE.EdgesGeometry( geometry ); // or WireframeGeometry
var mat_wireframe = new THREE.LineBasicMaterial( { color: 0xffffff, linewidth: 2 } );
var mesh_wireframe = new THREE.LineSegments( geo_wireframe, mat_wireframe );
scene.add( mesh_wireframe );
}
{ // points
var geo_points = new THREE.BufferGeometry();
var len=100000
var positions=[];
let mesh_size=20
let colors=[];
for(let i=0;i<len;i++){
let x=Math.random()*mesh_size-mesh_size/2
let y=Math.random()*mesh_size-mesh_size/2
let z=Math.random()*mesh_size-mesh_size/2
positions.push(x);
positions.push(y);
positions.push(z);
// colors.push((x+mesh_size/2)/mesh_size);
// colors.push((y+mesh_size/2)/mesh_size);
// colors.push((z+mesh_size/2)/mesh_size);
colors.push(1);
colors.push(0);
colors.push(0);
}
geo_points.addAttribute('position',new THREE.BufferAttribute(new Float32Array(positions),3));
geo_points.addAttribute('color',new THREE.BufferAttribute(new Float32Array(colors),3));
var mtl_points = new THREE.PointsMaterial({
// color:0xff0000,
size:.3,
vertexColors: THREE.VertexColors,
})
var mesh_points = new THREE.Points( geo_points, mtl_points );
scene.add(mesh_points);
}
// helper
// var helper={};
// helper.gridHelper = new THREE.GridHelper( 20 , 20 );
// scene.add( helper.gridHelper );
// helper.geometry_x = new THREE.BoxGeometry( 10 , 0.1 , 0.1 );
// helper.material_x = new THREE.MeshBasicMaterial( {color:'red'});
// helper.mesh_x=new THREE.Mesh(helper.geometry_x,helper.material_x);
// helper.mesh_x.position.x=5;
// scene.add(helper.mesh_x);
// helper.geometry_y = new THREE.BoxGeometry( .1 , 10 , 0.1 );
// helper.material_y = new THREE.MeshBasicMaterial( {color:'green'});
// helper.mesh_y=new THREE.Mesh(helper.geometry_y,helper.material_y);
// helper.mesh_y.position.y=5;
// scene.add(helper.mesh_y);
// helper.geometry_z = new THREE.BoxGeometry( .1 , .1 , 10 );
// helper.material_z = new THREE.MeshBasicMaterial( {color:'blue'});
// helper.mesh_z=new THREE.Mesh(helper.geometry_z,helper.material_z);
// helper.mesh_z.position.z=5;
// scene.add(helper.mesh_z);
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
var controls = new THREE.OrbitControls( camera_rendering, renderer.domElement );
{ // eliminate
raycaster = new THREE.Raycaster();
mouse = new THREE.Vector2();
geometry.computeBoundingBox()
for(let i=0;i<len;i++){
if(!geometry.boundingBox.containsPoint({x:positions[i*3],y:positions[i*3+1],z:positions[i*3+2]})){
geo_points.attributes.position.array[i*3]=0,geo_points.attributes.position.array[i*3+1]=0,geo_points.attributes.position.array[i*3+2]=0
}
else{
raycaster.set( {x:positions[i*3],y:positions[i*3+1],z:positions[i*3+2]}, {x:0,y:0,z:-1} );
intersects = raycaster.intersectObject( mesh );
if(intersects.length%2!==1){
geo_points.attributes.position.array[i*3]=0,geo_points.attributes.position.array[i*3+1]=0,geo_points.attributes.position.array[i*3+2]=0
}
}
}
geo_points.attributes.position.needsUpdate=true;
}
window.addEventListener( 'resize', onWindowResize, false );
}
animate();
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
requestAnimationFrame( animate );
render();
// stats.update();
}
function render() {
renderer.render( scene, camera_rendering );
}
</script>
</body>
</html>