more lua support, fixed scene 3

README.md

@@ -19,7 +19,6 @@ A ray marching renderer in rust
 
 ## What is planned
 - Testing of more shapes
-- Support for a lua-based scene representation DSL
 - Support for controlling the whole application from lua
 - Support for linking against a `scene.so` exporting a scene
 - Support for using as a library
@@ -27,6 +26,7 @@ A ray marching renderer in rust
 ## Examples
 ![1st test scene](prod/1.png)
 ![2nd test scene](prod/2.png)
+![3rd test scene](prod/3.png)
 ![randomly generated spheres](prod/randomspheres.png)
 ![randomly generated objects](prod/smolgalaxy.png)
 

scenes/randomspheres.lua

@@ -1,28 +1,20 @@
 local unpack = table.unpack or _G.unpack
-math.randomseed(os.time())
-
-local function randab(a, b)
-    return math.random() * (b-a) + a
-end
+util.seed()
 
 local function randtable(n, a, b)
     local t = {}
     for i=1, n do
-        t[i] = randab(a, b)
+        t[i] = util.randab(a, b)
     end
     return t
 end
 
-local function choice(list)
-    return list[math.random(1, #list)]
-end
-
 local function randomsphere()
     local pos = vec3.new(unpack(randtable(3, -2, 2)))
-    local radius = randab(0, 0.5)
+    local radius = util.randab(0, 0.5)
 	local emission = colorvec.new(unpack(randtable(4, 0, 1)))
     local reflection = colormat.new(unpack(randtable(16, 0, 1)))
-    local surfacetype = choice({surfacetype.DIFFUSE, surfacetype.REFLECTIVE, surfacetype.STOP})
+    local surfacetype = util.choice({surfacetype.DIFFUSE, surfacetype.REFLECTIVE, surfacetype.STOP})
 
     return obj.withmaterial(
         obj.sphere(pos, radius),
@@ -30,23 +22,8 @@ local function randomsphere()
     )
 end
 
-local function union(objs)
-    local n = #objs
-    if n == 1 then return objs[1] end
-
-    local mid = n//2
-    local left, right = {}, {}
-    for i=1, mid do
-        left[i] = objs[i]
-    end
-    for i=mid+1, n do
-        right[i-mid] = objs[i]
-    end
-	return obj.union(union(left), union(right))
-end
-
 local spheres = {}
 for i=1, 100 do
     spheres[i] = randomsphere()
 end
-return union(spheres)
+return util.union(spheres)

scenes/smolgalaxy.lua

@@ -1,30 +1,22 @@
 local unpack = table.unpack or _G.unpack
-math.randomseed(os.time())
+util.seed()
 
 local SCALE = 0.3
 local N_EACH = 25
 
-local function randab(a, b)
-	return math.random() * (b-a) + a
-end
-
 local function randtable(n, a, b)
 	local t = {}
 	for i=1, n do
-		t[i] = randab(a, b)
+		t[i] = util.randab(a, b)
 	end
 	return t
 end
 
-local function choice(list)
-	return list[math.random(1, #list)]
-end
-
 local MATERIALS = {surfacetype.DIFFUSE, surfacetype.REFLECTIVE, surfacetype.STOP}
 local function randommaterial()
 	local emission = colorvec.new(unpack(randtable(4, 0, 1)))
 	local reflection = colormat.new(unpack(randtable(16, 0, 1)))
-	local surfacetype = choice(MATERIALS)
+	local surfacetype = util.choice(MATERIALS)
 
 	return material.new(emission, reflection, surfacetype)
 end
@@ -62,20 +54,20 @@ local ORIENTATIONS = {
 	)
 }
 local function randomorientation()
-	return choice(ORIENTATIONS)
+	return util.choice(ORIENTATIONS)
 end
 
 local function randomsphere()
 	local pos = vec3.new(unpack(randtable(3, -2, 2)))
-	local radius = randab(0, SCALE)
+	local radius = util.randab(0, SCALE)
 
 	return obj.sphere(pos, radius)
 end
 
 local function randomtorus()
 	local pos = vec3.new(unpack(randtable(3, -2, 2)))
-	local radius = randab(0, SCALE)
-	local thickness = randab(radius/4, radius)
+	local radius = util.randab(0, SCALE)
+	local thickness = util.randab(radius/4, radius)
 	local orientation = randomorientation()
 
 	return obj.affinetransform(obj.torus(pos, radius, thickness), orientation, vec3.O)
@@ -83,15 +75,15 @@ end
 
 local function randomcuboid()
 	local pos = vec3.new(unpack(randtable(3, -2, 2)))
-	local radius = randab(0, SCALE)
+	local radius = util.randab(0, SCALE)
 
 	return obj.cuboid(pos, vec3.new(radius, radius, radius))
 end
 
 local function randomcylinder()
 	local pos = vec3.new(unpack(randtable(3, -2, 2)))
-	local radius = randab(0, SCALE)
-	local height = randab(0, SCALE)
+	local radius = util.randab(0, SCALE)
+	local height = util.randab(0, SCALE)
 	local orientation = randomorientation()
 
 	return obj.affinetransform(
@@ -104,25 +96,10 @@ local function randomcylinder()
 	)
 end
 
-local function union(objs)
-	local n = #objs
-	if n == 1 then return objs[1] end
-
-	local mid = n//2
-	local left, right = {}, {}
-	for i=1, mid do
-		left[i] = objs[i]
-	end
-	for i=mid+1, n do
-		right[i-mid] = objs[i]
-	end
-	return obj.union(union(left), union(right))
-end
-
 local objects = {}
 for i=1, N_EACH do table.insert(objects, randomsphere()) end
 for i=1, N_EACH do table.insert(objects, randomtorus()) end
 for i=1, N_EACH do table.insert(objects, randomcuboid()) end
 for i=1, N_EACH do table.insert(objects, randomcylinder()) end
 for i, object in ipairs(objects) do objects[i] = obj.withmaterial(object, randommaterial()) end
-return union(objects)
+return util.union(objects)

src/lua/color.rs

@@ -4,7 +4,7 @@ use rlua::{UserData, Context, Table};
 impl UserData for ColorVec {}
 impl UserData for ColorMat {}
 
-pub fn color_vec(ctx: Context, _: ()) -> rlua::Result<Table> {
+pub fn color_vec<'lua>(ctx: Context<'lua>, _env: Table<'lua>) -> rlua::Result<Table<'lua>> {
     let module = ctx.create_table()?;
 
     module.set("new", ctx.create_function(
@@ -16,7 +16,7 @@ pub fn color_vec(ctx: Context, _: ()) -> rlua::Result<Table> {
     Ok(module)
 }
 
-pub fn color_mat(ctx: Context, _: ()) -> rlua::Result<Table> {
+pub fn color_mat<'lua>(ctx: Context<'lua>, _env: Table<'lua>) -> rlua::Result<Table<'lua>> {
     let module = ctx.create_table()?;
 
     module.set("new", ctx.create_function(

src/lua/light.rs

@@ -3,7 +3,7 @@ use rlua::{UserData, Context, Table};
 
 impl UserData for Light {}
 
-pub fn light(ctx: Context, _: ()) -> rlua::Result<Table> {
+pub fn light<'lua>(ctx: Context<'lua>, _env: Table<'lua>) -> rlua::Result<Table<'lua>> {
     let module = ctx.create_table()?;
 
     module.set("new", ctx.create_function(

src/lua/mat3.rs

@@ -29,7 +29,7 @@ impl UserData for Mat3 {
     }
 }
 
-pub fn mat3(ctx: Context, _: ()) -> rlua::Result<Table> {
+pub fn mat3<'lua>(ctx: Context<'lua>, _env: Table<'lua>) -> rlua::Result<Table<'lua>> {
     let module = ctx.create_table()?;
 
     module.set("new", ctx.create_function(

src/lua/material.rs

@@ -4,7 +4,7 @@ use rlua::{UserData, Context, Table};
 impl UserData for SurfaceType {}
 impl UserData for Material {}
 
-pub fn surface_type(ctx: Context, _: ()) -> rlua::Result<Table> {
+pub fn surface_type<'lua>(ctx: Context<'lua>, _env: Table<'lua>) -> rlua::Result<Table<'lua>> {
     let module = ctx.create_table()?;
 
     module.set("DIFFUSE", SurfaceType::Diffuse)?;
@@ -14,7 +14,7 @@ pub fn surface_type(ctx: Context, _: ()) -> rlua::Result<Table> {
     Ok(module)
 }
 
-pub fn material(ctx: Context, _: ()) -> rlua::Result<Table> {
+pub fn material<'lua>(ctx: Context<'lua>, _env: Table<'lua>) -> rlua::Result<Table<'lua>> {
     let module = ctx.create_table()?;
 
     module.set("new", ctx.create_function(

src/lua/mod.rs

@@ -6,6 +6,8 @@ mod mat3;
 mod color;
 mod material;
 mod light;
+mod transform;
+mod util;
 
 pub use obj::{LuaObject, obj};
 pub use vec3::vec3;
@@ -13,25 +15,28 @@ pub use mat3::mat3;
 pub use color::{color_vec, color_mat};
 pub use material::{surface_type, material};
 pub use light::light;
+pub use transform::transform;
+pub use util::util;
 
-pub fn env(ctx: Context, _: ()) -> rlua::Result<Table> {
-    let module = ctx.create_table()?;
+pub fn add_scene_env<'lua>(ctx: Context<'lua>, env: Table<'lua>) -> rlua::Result<Table<'lua>> {
+    env.set("obj", obj(ctx, env.clone())?)?;
+    env.set("vec3", vec3(ctx, env.clone())?)?;
+    env.set("mat3", mat3(ctx, env.clone())?)?;
+    env.set("colorvec", color_vec(ctx, env.clone())?)?;
+    env.set("colormat", color_mat(ctx, env.clone())?)?;
+    env.set("surfacetype", surface_type(ctx, env.clone())?)?;
+    env.set("material", material(ctx, env.clone())?)?;
+    env.set("light", light(ctx, env.clone())?)?;
+    env.set("transform", transform(ctx, env.clone())?)?;
+    env.set("util", util(ctx, env.clone())?)?;
 
-    module.set("obj", obj(ctx, ())?)?;
-    module.set("vec3", vec3(ctx, ())?)?;
-    module.set("mat3", mat3(ctx, ())?)?;
-    module.set("colorvec", color_vec(ctx, ())?)?;
-    module.set("colormat", color_mat(ctx, ())?)?;
-    module.set("surfacetype", surface_type(ctx, ())?)?;
-    module.set("material", material(ctx, ())?)?;
-    module.set("light", light(ctx, ())?)?;
-
-    Ok(module)
+    Ok(env)
 }
 
 pub fn scene_from_file(file: String) -> rlua::Result<LuaObject> {
     Lua::new().context(|ctx| {
-        let env = env(ctx, ())?;
+        let env = ctx.create_table()?;
+        add_scene_env(ctx, env.clone())?;
         let meta = ctx.create_table()?;
         meta.set("__index", ctx.globals())?;
         env.set_metatable(Some(meta));

src/lua/obj.rs

@@ -27,7 +27,7 @@ impl Obj for LuaObject {
 
 impl UserData for LuaObject {}
 
-pub fn obj(ctx: Context, _: ()) -> rlua::Result<Table> {
+pub fn obj<'lua>(ctx: Context<'lua>, _env: Table<'lua>) -> rlua::Result<Table<'lua>> {
     let module = ctx.create_table()?;
 
     module.set("cuboid", ctx.create_function(
@@ -70,10 +70,14 @@ pub fn obj(ctx: Context, _: ()) -> rlua::Result<Table> {
         |ctx, ()| LuaObject::new(Waves::new())
     )?)?;
 
-    module.set("withlights", ctx.create_function(
+    module.set("withlight", ctx.create_function(
         |ctx, (obj, light): (LuaObject, Light)| LuaObject::new(WithLights::new_one(obj.get(), light))
     )?)?;
 
+    module.set("withlights", ctx.create_function(
+        |ctx, (obj, lights): (LuaObject, Vec<Light>)| LuaObject::new(WithAnyLights::new(obj.get(), lights))
+    )?)?;
+
     module.set("withmaterial", ctx.create_function(
         |ctx, (obj, material): (LuaObject, Material)| LuaObject::new(WithMaterial::new(obj.get(), material))
     )?)?;

src/lua/transform.rs

@@ -0,0 +1,40 @@
+use rlua::{Context, Table, Error};
+use crate::object::{SWAP_XY, SWAP_YZ, SWAP_XZ, scale_xyz, scale, scale_x, scale_y, scale_z};
+use crate::structs::{Mat3, I3};
+
+pub fn transform<'lua>(ctx: Context<'lua>, _env: Table<'lua>) -> rlua::Result<Table<'lua>> {
+    let module = ctx.create_table()?;
+
+    module.set("SWAPXY", SWAP_XY)?;
+    module.set("SWAPXZ", SWAP_XZ)?;
+    module.set("SWAPYZ", SWAP_YZ)?;
+
+    module.set("scalexyz", ctx.create_function(
+        |ctx, (x, y, z)| Ok(scale_xyz(x, y, z))
+    )?)?;
+    module.set("scale", ctx.create_function(
+        |ctx, k| Ok(scale(k))
+    )?)?;
+
+    module.set("scalex", ctx.create_function(
+        |ctx, k| Ok(scale_x(k))
+    )?)?;
+    module.set("scaley", ctx.create_function(
+        |ctx, k| Ok(scale_y(k))
+    )?)?;
+    module.set("scalez", ctx.create_function(
+        |ctx, k| Ok(scale_z(k))
+    )?)?;
+
+    module.set("stack", ctx.create_function(
+        |ctx, transforms: Vec<Mat3>| {
+            let mut acc = I3;
+            for trans in transforms.iter().rev().cloned() {
+                acc = trans * I3;
+            }
+            Ok(acc)
+        }
+    )?)?;
+
+    Ok(module)
+}

src/lua/util.lua

@@ -0,0 +1,71 @@
+local env = ...
+local obj = env.obj
+local vec3 = env.vec3
+local mat3 = env.mat3
+local transform = env.transform
+
+local M = {}
+
+-- technically a binary fold
+local function binstack(objs, fn)
+	local n = #objs
+	if n == 1 then return objs[1] end
+
+	local mid = n//2
+	local left, right = {}, {}
+	for i=1, mid do
+		left[i] = objs[i]
+	end
+	for i=mid+1, n do
+		right[i-mid] = objs[i]
+	end
+	return fn(binstack(left, fn), binstack(right, fn))
+end
+
+-- technically a fold
+local function linstack(objs, fn)
+	local head = objs[1]
+	for i=2, #objs do
+		head = fn(head, objs[i])
+	end
+	return head
+end
+
+-- random functions
+local SEED = os.getenv "SEED" or os.time()
+function M.seed()
+	math.randomseed(SEED)
+end
+function M.randab(a, b)
+	return math.random() * (b-a) + a
+end
+function M.choice(list)
+	return list[math.random(1, #list)]
+end
+
+-- multiple object composition
+function M.union(objs)
+	return binstack(objs, obj.union)
+end
+function M.intersection(objs)
+	return binstack(objs, obj.intersection)
+end
+function M.smoothunion(objs, k)
+	return linstack(objs, function(a, b) return obj.smoothunion(a, b, k) end)
+end
+function M.smoothintersection(objs, k)
+	return linstack(objs, function(a, b) return obj.smoothintersection(a, b, k) end)
+end
+
+-- simpler transformations
+function M.scale(object, k)
+	return obj.affinetransform(object, transform.scale(k), vec3.O)
+end
+function M.transform(object, mat)
+	return obj.affinetransform(object, mat, vec3.O)
+end
+function M.translate(object, vec)
+	return obj.affinetransform(object, mat3.O, vec)
+end
+
+return M

src/lua/util.rs

@@ -0,0 +1,5 @@
+use rlua::{Context, Table};
+
+pub fn util<'lua>(ctx: Context<'lua>, env: Table<'lua>) -> rlua::Result<Table<'lua>> {
+    ctx.load(include_str!("util.lua")).call(env)
+}

src/lua/vec3.rs

@@ -24,7 +24,7 @@ impl UserData for Vec3 {
     }
 }
 
-pub fn vec3(ctx: Context, _: ()) -> rlua::Result<Table> {
+pub fn vec3<'lua>(ctx: Context<'lua>, _env: Table<'lua>) -> rlua::Result<Table<'lua>> {
     let module = ctx.create_table()?;
 
     module.set("new", ctx.create_function(

src/main.rs

@@ -68,8 +68,7 @@ fn default_scene2() -> Scene {
 }
 
 fn default_scene3() -> Scene {
-    //TODO fix this scene
-    let s1 = WithMaterial::new(Sphere::new_xyz(4., 0., 0., 1.), WHITE);
+    let s1 = WithMaterial::new(Sphere::new_xyz(4., 0., 0., 1.), MIRROR);
     let s2 = WithMaterial::new(Sphere::new_xyz(3., 1., 1., 0.5), GREEN);
     let navion = WithMaterial::new(Plane::new_xyz(0., 1., -1., 3.), BLUE);
     let backwall = WithMaterial::new(Plane::new_xyz(-1., -1., -0.5, 8.), RED);
@@ -86,7 +85,8 @@ fn default_scene3() -> Scene {
 
 fn main() {
     // get scene and camera
-    let scene = scene_from_file("scenes/smolgalaxy.lua".to_owned()).unwrap();
+    //let scene = scene_from_file("scenes/randomspheres.lua".to_owned()).unwrap();
+    let scene = default_scene3();
     let cam = default_cam();
 
     // get stats on the scene we're about to render

src/object/mod.rs

@@ -70,6 +70,6 @@ pub use cylinder::Cylinder;
 pub use torus::Torus;
 pub use waves::Waves;
 pub use with_material::{WithMaterial, WithDynamicMaterial};
-pub use with_lights::{WithLights, WithLight};
+pub use with_lights::{WithLights, WithLight, WithAnyLights};
 pub use transform::*;
 pub use scene::Scene;

src/object/transform.rs

@@ -8,18 +8,19 @@ pub struct AffineTransform<T: Obj + Clone> {
     obj: T,
     transform: Mat3,
     transform_inv: Mat3,
-    translate: Vec3
+    translate: Vec3,
+    scale: f64
 }
 
 impl<T: Obj + Clone> AffineTransform<T> {
     pub fn new(obj: T, transform: Mat3, translate: Vec3) -> AffineTransform<T> {
-        AffineTransform { obj, transform, transform_inv: transform.invert(), translate }
+        AffineTransform { obj, transform, transform_inv: transform.invert(), translate, scale: transform.det().cbrt() }
     }
     pub fn new_linear(obj: T, transform: Mat3) -> AffineTransform<T> {
-        AffineTransform { obj, transform, transform_inv: transform.invert(), translate: O }
+        AffineTransform { obj, transform, transform_inv: transform.invert(), translate: O, scale: transform.det().cbrt() }
     }
     pub fn new_translate(obj: T, translate: Vec3) -> AffineTransform<T> {
-        AffineTransform { obj, transform: I3, transform_inv: I3, translate }
+        AffineTransform { obj, transform: I3, transform_inv: I3, translate, scale: 1. }
     }
 
     fn apply_rev(&self, point: Vec3) -> Vec3 {
@@ -60,7 +61,7 @@ pub const fn scale_z(k: f64) -> Mat3 { scale_xyz(1., 1., k) }
 
 impl<T: Obj + Clone> Obj for AffineTransform<T> {
     fn distance_to(&self, point: Vec3) -> f64 {
-        self.obj.distance_to(self.apply_rev(point))
+        self.obj.distance_to(self.apply_rev(point)) * self.scale
     }
     fn normal_at(&self, point: Vec3) -> Vec3 {
         self.apply_fwd(self.obj.normal_at(self.apply_rev(point))).unit()

src/object/with_lights.rs

@@ -41,4 +41,40 @@ impl<T: Obj> WithLight<T> {
     pub fn new_one(obj: T, light: Light) -> WithLight<T> {
         WithLight { obj, lights: [light; 1] }
     }
+}
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct WithAnyLights<T: Obj> {
+    obj: T,
+    lights: Vec<Light>
+}
+
+impl<T: Obj> WithAnyLights<T> {
+    pub fn new(obj: T, lights: Vec<Light>) -> WithAnyLights<T> {
+        WithAnyLights { obj, lights }
+    }
+
+    pub fn add_light(&mut self, light: Light) {
+        self.lights.push(light)
+    }
+}
+
+impl<T: Obj> Obj for WithAnyLights<T> {
+    fn distance_to(&self, point: Vec3) -> f64 {
+        self.obj.distance_to(point)
+    }
+    fn normal_at(&self, point: Vec3) -> Vec3 {
+        self.obj.normal_at(point)
+    }
+    fn material_at(&self, point: Vec3) -> Material {
+        self.obj.material_at(point)
+    }
+    fn get_lights(&self) -> Vec<Light> {
+        let mut l = self.obj.get_lights();
+        l.extend(&self.lights);
+        l
+    }
+    fn node_count(&self) -> u32 {
+        self.obj.node_count() + 1
+    }
 }

test

@@ -2,6 +2,6 @@
 clear
 cargo build --release && \
 	clear && \
-	time target/release/rmarcher && \
+	time SEED=0 target/release/rmarcher && \
 	printf '\n' && \
 	kitty +kitten icat --align=left a.png