source: other-projects/playing-in-the-street/summer-2013/trunk/Playing-in-the-Street-WPF/Content/Web/mrdoob-three.js-4862f5f/test/unit/math/Ray.js@ 28897

/**
 * @author bhouston / http://exocortex.com
 */

module( "Ray" );

test( "constructor/equals", function() {
    var a = new THREE.Ray();
    ok( a.origin.equals( zero3 ), "Passed!" );
    ok( a.direction.equals( zero3 ), "Passed!" );

    a = new THREE.Ray( two3.clone(), one3.clone() );
    ok( a.origin.equals( two3 ), "Passed!" );
    ok( a.direction.equals( one3 ), "Passed!" );
});

test( "copy/equals", function() {
    var a = new THREE.Ray( zero3.clone(), one3.clone() );
    var b = new THREE.Ray().copy( a );
    ok( b.origin.equals( zero3 ), "Passed!" );
    ok( b.direction.equals( one3 ), "Passed!" );

    // ensure that it is a true copy
    a.origin = zero3;
    a.direction = one3;
    ok( b.origin.equals( zero3 ), "Passed!" );
    ok( b.direction.equals( one3 ), "Passed!" );
});

test( "set", function() {
    var a = new THREE.Ray();

    a.set( one3, one3 );
    ok( a.origin.equals( one3 ), "Passed!" );
    ok( a.direction.equals( one3 ), "Passed!" );
});

test( "at", function() {
    var a = new THREE.Ray( one3.clone(), new THREE.Vector3( 0, 0, 1 ) );

    ok( a.at( 0 ).equals( one3 ), "Passed!" );
    ok( a.at( -1 ).equals( new THREE.Vector3( 1, 1, 0 ) ), "Passed!" );
    ok( a.at( 1 ).equals( new THREE.Vector3( 1, 1, 2 ) ), "Passed!" );
});

test( "recast/clone", function() {
    var a = new THREE.Ray( one3.clone(), new THREE.Vector3( 0, 0, 1 ) );

    ok( a.recast( 0 ).equals( a ), "Passed!" );

    var b = a.clone();
    ok( b.recast( -1 ).equals( new THREE.Ray( new THREE.Vector3( 1, 1, 0 ), new THREE.Vector3( 0, 0, 1 ) ) ), "Passed!" );

    var c = a.clone();
    ok( c.recast( 1 ).equals( new THREE.Ray( new THREE.Vector3( 1, 1, 2 ), new THREE.Vector3( 0, 0, 1 ) ) ), "Passed!" );

    var d = a.clone();
    var e = d.clone().recast( 1 );
    ok( d.equals( a ), "Passed!" );
    ok( ! e.equals( d ), "Passed!" );
    ok( e.equals( c ), "Passed!" );
});

test( "closestPointToPoint", function() {
    var a = new THREE.Ray( one3.clone(), new THREE.Vector3( 0, 0, 1 ) );

    // behind the ray
    var b = a.closestPointToPoint( zero3 );
    ok( b.equals( one3 ), "Passed!" );

    // front of the ray
    var c = a.closestPointToPoint( new THREE.Vector3( 0, 0, 50 ) );
    ok( c.equals( new THREE.Vector3( 1, 1, 50 ) ), "Passed!" );

    // exactly on the ray
    var d = a.closestPointToPoint( one3 );
    ok( d.equals( one3 ), "Passed!" );
});

test( "distanceToPoint", function() {
    var a = new THREE.Ray( one3.clone(), new THREE.Vector3( 0, 0, 1 ) );

    // behind the ray
    var b = a.distanceToPoint( zero3 );
    ok( b === Math.sqrt( 3 ), "Passed!" );

    // front of the ray
    var c = a.distanceToPoint( new THREE.Vector3( 0, 0, 50 ) );
    ok( c === Math.sqrt( 2 ), "Passed!" );

    // exactly on the ray
    var d = a.distanceToPoint( one3 );
    ok( d === 0, "Passed!" );
});

test( "isIntersectionSphere", function() {
    var a = new THREE.Ray( one3.clone(), new THREE.Vector3( 0, 0, 1 ) );
    var b = new THREE.Sphere( zero3, 0.5 );
    var c = new THREE.Sphere( zero3, 1.5 );
    var d = new THREE.Sphere( one3, 0.1 );
    var e = new THREE.Sphere( two3, 0.1 );
    var f = new THREE.Sphere( two3, 1 );

    ok( ! a.isIntersectionSphere( b ), "Passed!" );
    ok( ! a.isIntersectionSphere( c ), "Passed!" );
    ok( a.isIntersectionSphere( d ), "Passed!" );
    ok( ! a.isIntersectionSphere( e ), "Passed!" );
    ok( ! a.isIntersectionSphere( f ), "Passed!" );
});

test( "isIntersectionPlane", function() {
    var a = new THREE.Ray( one3.clone(), new THREE.Vector3( 0, 0, 1 ) );

    // parallel plane in front of the ray
    var b = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3( 0, 0, 1 ), one3.clone().sub( new THREE.Vector3( 0, 0, -1 ) ) );
    ok( a.isIntersectionPlane( b ), "Passed!" );

    // parallel plane coincident with origin
    var c = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3( 0, 0, 1 ), one3.clone().sub( new THREE.Vector3( 0, 0, 0 ) ) );
    ok( a.isIntersectionPlane( c ), "Passed!" );

    // parallel plane behind the ray
    var d = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3( 0, 0, 1 ), one3.clone().sub( new THREE.Vector3( 0, 0, 1 ) ) );
    ok( ! a.isIntersectionPlane( d ), "Passed!" );

    // perpendical ray that overlaps exactly
    var e = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3( 1, 0, 0 ), one3 );
    ok( a.isIntersectionPlane( e ), "Passed!" );

    // perpendical ray that doesn't overlap
    var f = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3( 1, 0, 0 ), zero3 );
    ok( ! a.isIntersectionPlane( f ), "Passed!" );
});

test( "intersectPlane", function() {
    var a = new THREE.Ray( one3.clone(), new THREE.Vector3( 0, 0, 1 ) );

    // parallel plane behind
    var b = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3( 0, 0, 1 ), new THREE.Vector3( 1, 1, -1 ) );
    ok( a.intersectPlane( b ) === null, "Passed!" );

    // parallel plane coincident with origin
    var c = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3( 0, 0, 1 ), new THREE.Vector3( 1, 1, 0 ) );
    ok( a.intersectPlane( c ) === null, "Passed!" );

    // parallel plane infront
    var d = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3( 0, 0, 1 ), new THREE.Vector3( 1, 1, 1 ) );
    ok( a.intersectPlane( d ).equals( a.origin ), "Passed!" );

    // perpendical ray that overlaps exactly
    var e = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3( 1, 0, 0 ), one3 );
    ok( a.intersectPlane( e ).equals( a.origin ), "Passed!" );

    // perpendical ray that doesn't overlap
    var f = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3( 1, 0, 0 ), zero3 );
    ok( a.intersectPlane( f ) === null, "Passed!" );
});


test( "applyMatrix4", function() {
    var a = new THREE.Ray( one3.clone(), new THREE.Vector3( 0, 0, 1 ) );
    var m = new THREE.Matrix4();

    ok( a.clone().applyMatrix4( m ).equals( a ), "Passed!" );

    a = new THREE.Ray( zero3.clone(), new THREE.Vector3( 0, 0, 1 ) );
    m.makeRotationZ( Math.PI );
    ok( a.clone().applyMatrix4( m ).equals( a ), "Passed!" );

    m.makeRotationX( Math.PI );
    var b = a.clone();
    b.direction.negate();
    var a2 = a.clone().applyMatrix4( m );
    ok( a2.origin.distanceTo( b.origin ) < 0.0001, "Passed!" );
    ok( a2.direction.distanceTo( b.direction ) < 0.0001, "Passed!" );

    a.origin = new THREE.Vector3( 0, 0, 1 );
    b.origin = new THREE.Vector3( 0, 0, -1 );
    var a2 = a.clone().applyMatrix4( m );
    ok( a2.origin.distanceTo( b.origin ) < 0.0001, "Passed!" );
    ok( a2.direction.distanceTo( b.direction ) < 0.0001, "Passed!" );
});


test( "distanceSqToSegment", function() {
    var a = new THREE.Ray( one3.clone(), new THREE.Vector3( 0, 0, 1 ) );
    var ptOnLine = new THREE.Vector3();
    var ptOnSegment = new THREE.Vector3();

    //segment in front of the ray
    var v0 = new THREE.Vector3( 3, 5, 50 );
    var v1 = new THREE.Vector3( 50, 50, 50 ); // just a far away point
    var distSqr = a.distanceSqToSegment( v0, v1, ptOnLine, ptOnSegment );

    ok( ptOnSegment.distanceTo( v0 ) < 0.0001, "Passed!" );
    ok( ptOnLine.distanceTo( new THREE.Vector3(1, 1, 50) ) < 0.0001, "Passed!" );
    // ((3-1) * (3-1) + (5-1) * (5-1) = 4 + 16 = 20
    ok( Math.abs( distSqr - 20 ) < 0.0001, "Passed!" );

    //segment behind the ray
    v0 = new THREE.Vector3( -50, -50, -50 ); // just a far away point
    v1 = new THREE.Vector3( -3, -5, -4 );
    distSqr = a.distanceSqToSegment( v0, v1, ptOnLine, ptOnSegment );

    ok( ptOnSegment.distanceTo( v1 ) < 0.0001, "Passed!" );
    ok( ptOnLine.distanceTo( one3 ) < 0.0001, "Passed!" );
    // ((-3-1) * (-3-1) + (-5-1) * (-5-1) + (-4-1) + (-4-1) = 16 + 36 + 25 = 77
    ok( Math.abs( distSqr - 77 ) < 0.0001, "Passed!" );

    //exact intersection between the ray and the segment
    v0 = new THREE.Vector3( -50, -50, -50 );
    v1 = new THREE.Vector3( 50, 50, 50 );
    distSqr = a.distanceSqToSegment( v0, v1, ptOnLine, ptOnSegment );

    ok( ptOnSegment.distanceTo( one3 ) < 0.0001, "Passed!" );
    ok( ptOnLine.distanceTo( one3 ) < 0.0001, "Passed!" );
    ok( distSqr < 0.0001, "Passed!" );
});

test( "intersectBox", function() {

    var TOL = 0.0001;
    
    var box = new THREE.Box3( new THREE.Vector3(  -1, -1, -1 ), new THREE.Vector3( 1, 1, 1 ) );

    var a = new THREE.Ray( new THREE.Vector3( -2, 0, 0 ), new THREE.Vector3( 1, 0, 0) );
    //ray should intersect box at -1,0,0
    ok( a.isIntersectionBox(box) === true, "Passed!" );
    ok( a.intersectBox(box).distanceTo( new THREE.Vector3( -1, 0, 0 ) ) < TOL, "Passed!" );

    var b = new THREE.Ray( new THREE.Vector3( -2, 0, 0 ), new THREE.Vector3( -1, 0, 0) );
    //ray is point away from box, it should not intersect
    ok( b.isIntersectionBox(box) === false, "Passed!" );
    ok( b.intersectBox(box) === null, "Passed!" );

    var c = new THREE.Ray( new THREE.Vector3( 0, 0, 0 ), new THREE.Vector3( 1, 0, 0) );
    // ray is inside box, should return exit point
    ok( c.isIntersectionBox(box) === true, "Passed!" );
    ok( c.intersectBox(box).distanceTo( new THREE.Vector3( 1, 0, 0 ) ) < TOL, "Passed!" );

    var d = new THREE.Ray( new THREE.Vector3( 0, 2, 1 ), new THREE.Vector3( 0, -1, -1).normalize() );
    //tilted ray should intersect box at 0,1,0
    ok( d.isIntersectionBox(box) === true, "Passed!" );
    ok( d.intersectBox(box).distanceTo( new THREE.Vector3( 0, 1, 0 ) ) < TOL, "Passed!" );  

    var e = new THREE.Ray( new THREE.Vector3( 1, -2, 1 ), new THREE.Vector3( 0, 1, 0).normalize() );
    //handle case where ray is coplanar with one of the boxes side - box in front of ray
    ok( e.isIntersectionBox(box) === true, "Passed!" );
    ok( e.intersectBox(box).distanceTo( new THREE.Vector3( 1, -1, 1 ) ) < TOL, "Passed!" ); 
    
    var f = new THREE.Ray( new THREE.Vector3( 1, -2, 0 ), new THREE.Vector3( 0, -1, 0).normalize() );
    //handle case where ray is coplanar with one of the boxes side - box behind ray
    ok( f.isIntersectionBox(box) === false, "Passed!" );
    ok( f.intersectBox(box) == null, "Passed!" );       
    
});