Add .gitignore file

.gitignore

@@ -0,0 +1,14 @@
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# Debug output of program
+*.ppm

Cargo.lock

@@ -1,298 +0,0 @@
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src/main.rs

@@ -55,8 +55,8 @@ fn main() -> std::io::Result<()> {
     let camera = Camera::new(Point3::new(0.0,0.0,0.0), Vector3::new(0.0,0.0,-1.0), 1.0, 2.0, 2.0, 400, 400);
 
     let scene = vec![
-        Object::Sphere(Sphere::new(0.0,0.0,-5.0,2.0, |_, _| Color::white())),
+        Object::Sphere(Sphere::new_solid(0.0,0.0,-5.0,2.0, Color::white())),
-        Object::Sphere(Sphere::new(-3.0,0.0,-8.0,2.5, |_, _| Color::white()))
+        Object::Sphere(Sphere::new_solid(-3.0,0.0,-8.0,2.5, Color::white()))
     ];
 
     render(&camera, &scene, "out.ppm")