e2r 0.2.0

experimental rendering engine in rust
Documentation 
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use interface::i_shape::IShape;
use interface::i_comparable::IComparableError;

use implement::math::ray::Ray3;
use implement::math::sphere::Sphere;

use implement::math::mat::Mat3x1;

#[test]
fn test_intersect_ray_sphere() {
    //Ray Sphere intersection
    {
        let a = Ray3::init( &[ 5f64, 0f64, 0f64 ], &[ 1f64, 0f64, 0f64 ] );
        let b = Sphere::init( &[ 20f64, 0f64, 0f64 ], 5f64 );
        match a.get_intersect( &b ) {
            ( true, Some(loc) ) => {
                assert!( loc.is_equal( &Mat3x1 { _val: [ 15f64, 0f64, 0f64 ] }, 0.0001f64 ).unwrap() );
            },
            _ => panic!("unexpected result for ray sphere intersection" ),
        }
    }

    //Ray Sphere no intersection, opposing direction
    {
        let a = Ray3::init( &[ 5f64, 0f64, 0f64 ], &[ -1f64, 0f64, 0f64 ] );
        let b = Sphere::init( &[ 20f64, 0f64, 0f64 ], 5f64 );
        match a.get_intersect( &b ) {
            ( false, None ) => (),
            _ => panic!("unexpected result for ray sphere no intersection" ),
        }
    }

    //Ray Sphere intersection, at edge
    {
        let a = Ray3::init( &[ 30f64, 10f64, 10f64 ], &[ -1f64, 0f64, 0f64 ] );
        let b = Sphere::init( &[ 20f64, 10f64, 10f64 ], 5f64 );
        match a.get_intersect( &b ) {
            ( true, Some(loc) ) => {
                assert!( loc.is_equal( &Mat3x1 { _val: [ 25f64, 10f64, 10f64 ] }, 0.0001f64 ).unwrap() );
            },
            _ => panic!("unexpected result for ray sphere intersection" ),
        }
    }

    //Ray Sphere intersection, oblique angle
    {
        let a = Ray3::init( &[ 30f64, 10f64, 10f64 ], &[ -1f64, -1f64, -1f64 ] );
        let b = Sphere::init( &[ 20f64, 0f64, 0f64 ], 5f64 );
        match a.get_intersect( &b ) {
            ( true, Some(loc) ) => {
                let c = (25f64/3f64).sqrt();
                println!( "loc: {:?}", loc );
                assert!( loc.is_equal( &Mat3x1 { _val: [ 20f64 + c, 0f64 + c, 0f64 + c ] }, 0.0001f64 ).unwrap() );
            },
            _ => panic!("unexpected result for ray sphere intersection" ),
        }
    }

    //Ray Sphere no intersection
    {
        let a = Ray3::init( &[ 30f64, 10f64, 10f64 ], &[ -1f64, 0f64, -1f64 ] );
        let b = Sphere::init( &[ 20f64, 0f64, 0f64 ], 5f64 );
        match a.get_intersect( &b ) {
            ( false, None ) => (),
            _ => panic!("unexpected result for ray sphere no intersection" ),
        }
    }
}