Fix math rendering

cg_codebase.md

@@ -675,11 +675,15 @@ Interaction Surface::rayPlaneIntersect(Ray ray, Vector3f p, Vector3f n)
 Here, we are finding using past principles, the intersection of a ray to the point.
 
 We have the equations:
+
 $$r(t) = \vec o + t \vec d $$
+
 $$and$$
+
 $$(\vec x - \vec p) \cdot \vec n = 0$$
 
 Solving for t, we get:
+
 $$t = - \frac{(\vec o - \vec p) \cdot \vec n}{\vec d \cdot \vec n}$$
 
 Explain this: