new scene from inside a spherical mirror

README.md

@@ -29,6 +29,7 @@ A ray marching renderer in rust
 ![3rd test scene](prod/3.png)
 ![randomly generated spheres](prod/randomspheres.png)
 ![randomly generated objects](prod/smolgalaxy.png)
+![inside a spherical mirror](prod/insidemirror.png)
 
 ## License
 MIT

scenes/insidemirror.lua

@@ -0,0 +1,42 @@
+local mirror = obj.withmaterial(
+	obj.negation(
+		obj.sphere(vec3.O, 8)
+	),
+	material.newfromdiagonal(
+		colorvec.new(0, 0, 0, 0),
+		colorvec.new(1, 1, 1, 1),
+		surfacetype.REFLECTIVE
+	)
+)
+
+local objects = {
+	obj.withmaterial(
+		obj.torus(vec3.new(1, 0, -3), 2, 1),
+		material.newfromdiagonal(
+			colorvec.new(1, .5, .2, 0),
+			colorvec.new(1, 1, 1, 1),
+			surfacetype.DIFFUSE
+		)
+	),
+	obj.withmaterial(
+		obj.sphere(vec3.new(3, 2, 0), 1),
+		material.newfromdiagonal(
+			colorvec.new(0, 0, 0, 0),
+			colorvec.new(.2, .5, 1, 0),
+			surfacetype.DIFFUSE
+		)
+	),
+	obj.withmaterial(
+		obj.cuboid(vec3.new(-3, -1, 2), vec3.new(1, 1, 1)),
+		material.newfromdiagonal(
+			colorvec.new(0, 0, 0, 0),
+			colorvec.new(.2, 1, .5, 0),
+			surfacetype.DIFFUSE
+		)
+	)
+}
+
+return obj.union(
+	util.union(objects),
+	mirror
+)

src/lua/obj.rs

@@ -46,6 +46,10 @@ pub fn obj<'lua>(ctx: Context<'lua>, _env: Table<'lua>) -> rlua::Result<Table<'l
         |ctx, (a, b): (LuaObject, LuaObject)| LuaObject::new(Intersection::new(a.get(), b.get()))
     )?)?;
 
+    module.set("negation", ctx.create_function(
+        |ctx, obj: LuaObject| LuaObject::new(Negation::new(obj.get()))
+    )?)?;
+
     module.set("plane", ctx.create_function(
         |ctx, (normal, offset): (Vec3, f64)| LuaObject::new(Plane::new(normal, offset))
     )?)?;

src/main.rs

@@ -85,8 +85,8 @@ fn default_scene3() -> Scene {
 
 fn main() {
     // get scene and camera
-    //let scene = scene_from_file("scenes/randomspheres.lua".to_owned()).unwrap();
-    let scene = default_scene3();
+    let scene = scene_from_file("scenes/insidemirror.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

@@ -10,6 +10,7 @@ mod plane;
 mod union;
 mod intersection;
 mod exclusion;
+mod negation;
 mod cuboid;
 mod cylinder;
 mod torus;
@@ -65,6 +66,7 @@ pub use plane::Plane;
 pub use union::Union;
 pub use intersection::Intersection;
 pub use exclusion::Exclusion;
+pub use negation::Negation;
 pub use cuboid::Cuboid;
 pub use cylinder::Cylinder;
 pub use torus::Torus;

src/object/negation.rs

@@ -0,0 +1,33 @@
+use crate::object::Obj;
+use crate::structs::Vec3;
+use crate::material::Material;
+use crate::light::Light;
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct Negation<T: Obj> {
+    obj: T
+}
+
+impl<T: Obj> Negation<T> {
+    pub fn new(obj: T) -> Negation<T> {
+        Negation { obj }
+    }
+}
+
+impl<T: Obj> Obj for Negation<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> {
+        self.obj.get_lights()
+    }
+    fn node_count(&self) -> u32 {
+        self.obj.node_count() + 1
+    }
+}