Add orthographic camera

src/xyz/marsavic/gfxlab/graphics3d/cameras/Orthographic.java

@@ -0,0 +1,14 @@
+package xyz.marsavic.gfxlab.graphics3d.cameras;
+
+import xyz.marsavic.geometry.Vector;
+import xyz.marsavic.gfxlab.Vec3;
+import xyz.marsavic.gfxlab.graphics3d.Camera;
+import xyz.marsavic.gfxlab.graphics3d.Ray;
+
+public class Orthographic implements Camera {
+
+    @Override
+    public Ray exitingRay(Vector p) {
+        return Ray.pd(Vec3.zp(0, p), Vec3.xyz(0, 0, 1));
+    }
+}