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Visualize surface normals

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This commit is contained in:
Samrat Man Singh 2016-03-10 21:14:52 +05:45
parent f9217e45ea
commit fc2f1f244b
2 changed files with 20 additions and 8 deletions
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5
src/Makefile Normal file
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@ -0,0 +1,5 @@
build:
ocamlbuild -use-ocamlfind -package core -tag thread raytracer.native
display: build
./raytracer.native > foo.ppm
display foo.ppm

23
src/raytracer.ml
View file

@ -7,20 +7,27 @@ type sphere = { center: Vec3.vec3;
type ray = { origin: Vec3.vec3; type ray = { origin: Vec3.vec3;
dir: Vec3.vec3 } dir: Vec3.vec3 }
let point_at_parameter r t =
add r.origin (mul t r.dir)
let hit_sphere sphere ray = let hit_sphere sphere ray =
let oc = sub ray.dir sphere.center in let oc = sub ray.origin sphere.center in
let a = dot ray.dir ray.dir in let a = dot ray.dir ray.dir in
let b = dot oc ray.dir in let b = (dot oc ray.dir) in
let c = (dot oc oc) -. (sphere.radius *. sphere.radius) in let c = (dot oc oc) -. (sphere.radius *. sphere.radius) in
let discriminant = b*.b -. a*.c in let discriminant = b*.b -. a*.c in
( discriminant > 0.0) if (discriminant > 0.0)
then (-.b +. (sqrt discriminant)) /. a
else -1.0
let get_color ray = let get_color ray =
if (hit_sphere {center = Vec3.of_floats (0., 0., -1.); let sphere = {center = Vec3.of_floats (0., 0., -1.);
radius = 0.5} radius = 0.5 } in
ray) let t = (hit_sphere sphere ray) in
then Vec3.of_floats (1., 0., 0.) if (t > 0.0)
then let n = unit_vector (sub (point_at_parameter ray t) sphere.center) 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 else let unit_direction = unit_vector ray.dir in
let t = 0.5 *. (unit_direction.y +. 1.0) 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}) 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})
@ -60,4 +67,4 @@ let main() =
done done
;; ;;
(* main() *) main()