three
Version:
JavaScript 3D library
195 lines (127 loc) • 5.59 kB
JavaScript
console.warn( "THREE.LineSegments2: As part of the transition to ES6 Modules, the files in 'examples/js' were deprecated in May 2020 (r117) and will be deleted in December 2020 (r124). You can find more information about developing using ES6 Modules in https://threejs.org/docs/#manual/en/introduction/Installation." );
THREE.LineSegments2 = function ( geometry, material ) {
THREE.Mesh.call( this );
this.type = 'LineSegments2';
this.geometry = geometry !== undefined ? geometry : new THREE.LineSegmentsGeometry();
this.material = material !== undefined ? material : new THREE.LineMaterial( { color: Math.random() * 0xffffff } );
};
THREE.LineSegments2.prototype = Object.assign( Object.create( THREE.Mesh.prototype ), {
constructor: THREE.LineSegments2,
isLineSegments2: true,
computeLineDistances: ( function () { // for backwards-compatability, but could be a method of LineSegmentsGeometry...
var start = new THREE.Vector3();
var end = new THREE.Vector3();
return function computeLineDistances() {
var geometry = this.geometry;
var instanceStart = geometry.attributes.instanceStart;
var instanceEnd = geometry.attributes.instanceEnd;
var lineDistances = new Float32Array( 2 * instanceStart.data.count );
for ( var i = 0, j = 0, l = instanceStart.data.count; i < l; i ++, j += 2 ) {
start.fromBufferAttribute( instanceStart, i );
end.fromBufferAttribute( instanceEnd, i );
lineDistances[ j ] = ( j === 0 ) ? 0 : lineDistances[ j - 1 ];
lineDistances[ j + 1 ] = lineDistances[ j ] + start.distanceTo( end );
}
var instanceDistanceBuffer = new THREE.InstancedInterleavedBuffer( lineDistances, 2, 1 ); // d0, d1
geometry.setAttribute( 'instanceDistanceStart', new THREE.InterleavedBufferAttribute( instanceDistanceBuffer, 1, 0 ) ); // d0
geometry.setAttribute( 'instanceDistanceEnd', new THREE.InterleavedBufferAttribute( instanceDistanceBuffer, 1, 1 ) ); // d1
return this;
};
}() ),
raycast: ( function () {
var start = new THREE.Vector4();
var end = new THREE.Vector4();
var ssOrigin = new THREE.Vector4();
var ssOrigin3 = new THREE.Vector3();
var mvMatrix = new THREE.Matrix4();
var line = new THREE.Line3();
var closestPoint = new THREE.Vector3();
return function raycast( raycaster, intersects ) {
if ( raycaster.camera === null ) {
console.error( 'LineSegments2: "Raycaster.camera" needs to be set in order to raycast against LineSegments2.' );
}
var ray = raycaster.ray;
var camera = raycaster.camera;
var projectionMatrix = camera.projectionMatrix;
var geometry = this.geometry;
var material = this.material;
var resolution = material.resolution;
var lineWidth = material.linewidth;
var instanceStart = geometry.attributes.instanceStart;
var instanceEnd = geometry.attributes.instanceEnd;
// pick a point 1 unit out along the ray to avoid the ray origin
// sitting at the camera origin which will cause "w" to be 0 when
// applying the projection matrix.
ray.at( 1, ssOrigin );
// ndc space [ - 1.0, 1.0 ]
ssOrigin.w = 1;
ssOrigin.applyMatrix4( camera.matrixWorldInverse );
ssOrigin.applyMatrix4( projectionMatrix );
ssOrigin.multiplyScalar( 1 / ssOrigin.w );
// screen space
ssOrigin.x *= resolution.x / 2;
ssOrigin.y *= resolution.y / 2;
ssOrigin.z = 0;
ssOrigin3.copy( ssOrigin );
var matrixWorld = this.matrixWorld;
mvMatrix.multiplyMatrices( camera.matrixWorldInverse, matrixWorld );
for ( var i = 0, l = instanceStart.count; i < l; i ++ ) {
start.fromBufferAttribute( instanceStart, i );
end.fromBufferAttribute( instanceEnd, i );
start.w = 1;
end.w = 1;
// camera space
start.applyMatrix4( mvMatrix );
end.applyMatrix4( mvMatrix );
// clip space
start.applyMatrix4( projectionMatrix );
end.applyMatrix4( projectionMatrix );
// ndc space [ - 1.0, 1.0 ]
start.multiplyScalar( 1 / start.w );
end.multiplyScalar( 1 / end.w );
// skip the segment if it's outside the camera near and far planes
var isBehindCameraNear = start.z < - 1 && end.z < - 1;
var isPastCameraFar = start.z > 1 && end.z > 1;
if ( isBehindCameraNear || isPastCameraFar ) {
continue;
}
// screen space
start.x *= resolution.x / 2;
start.y *= resolution.y / 2;
end.x *= resolution.x / 2;
end.y *= resolution.y / 2;
// create 2d segment
line.start.copy( start );
line.start.z = 0;
line.end.copy( end );
line.end.z = 0;
// get closest point on ray to segment
var param = line.closestPointToPointParameter( ssOrigin3, true );
line.at( param, closestPoint );
// check if the intersection point is within clip space
var zPos = THREE.MathUtils.lerp( start.z, end.z, param );
var isInClipSpace = zPos >= - 1 && zPos <= 1;
var isInside = ssOrigin3.distanceTo( closestPoint ) < lineWidth * 0.5;
if ( isInClipSpace && isInside ) {
line.start.fromBufferAttribute( instanceStart, i );
line.end.fromBufferAttribute( instanceEnd, i );
line.start.applyMatrix4( matrixWorld );
line.end.applyMatrix4( matrixWorld );
var pointOnLine = new THREE.Vector3();
var point = new THREE.Vector3();
ray.distanceSqToSegment( line.start, line.end, point, pointOnLine );
intersects.push( {
point: point,
pointOnLine: pointOnLine,
distance: ray.origin.distanceTo( point ),
object: this,
face: null,
faceIndex: i,
uv: null,
uv2: null,
} );
}
}
};
}() )
} );