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This commit is contained in:
Samrat Man Singh 2016-03-12 15:24:17 +05:45
parent 7b75b7c2fc
commit 612e9d8af0
1 changed files with 18 additions and 8 deletions
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26
src/raytracer.ml
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@ -15,6 +15,19 @@ type hit_rec = { t : float;
type hit = hit_rec option
let random_in_unit_sphere () =
let p = ref (Vec3.of_floats ((Random.float 1.0),
(Random.float 1.0),
(Random.float 1.0))) in
while ((Vec3.dot !p !p) >= 1.0) do
p := Vec3.mul 2.0 (Vec3.sub (Vec3.of_floats ((Random.float 1.0),
(Random.float 1.0),
(Random.float 1.0)))
(Vec3.of_floats (1., 1., 1.)))
done;
!p
;;
let hit_sphere sphere ray (tmin, tmax) =
let oc = sub ray.origin sphere.center in
@ -63,16 +76,13 @@ and hit h ray (tmin, tmax) =
| World w -> hit_world w ray (tmin, tmax)
let get_color world ray =
let rec get_color world ray =
match (hit world ray (0., Float.infinity)) with
Some hit_result ->
let t = hit_result.t in
if (t > 0.0)
then let n = hit_result.normal in
mul 0.5 (Vec3.of_floats (n.x +. 1., n.y +. 1., n.z +. 1.))
else let unit_direction = unit_vector ray.dir in
let t = 0.5 *. (unit_direction.y +. 1.0) in
add (mul (1.0 -. t) {x= 1.0; y=1.0; z= 1.0}) (mul t {x= 0.5; y= 0.7; z= 1.0})
let target = Vec3.add (Vec3.add hit_result.p hit_result.normal)
(random_in_unit_sphere ()) in
Vec3.mul 0.5 (get_color world {origin = hit_result.p;
dir = Vec3.sub target hit_result.p})
| None ->
let unit_direction = unit_vector ray.dir in
let t = 0.5 *. (unit_direction.y +. 1.0) in