# Lab B01 Ray Casting and Visibility

### Tasks

This lab focuses on building a ray casting loop, calculate the direction of rays through pixels, and intersect rays with a sphere.

Lab B01 corresponds to chapter 1-6.4 of Prof. Shirley's Ray Tracing in One Weekend.

You can directly follow Prof. Shirley's Tutorial at

{% embed url="<https://raytracing.github.io/books/RayTracingInOneWeekend.html#overview>" %}

#### Expected Duration

* **Scheduled lab time:** 1 hour
* **Expected independent study:** 2 hours

You are not expected to complete all tasks during the lab session.

#### Focus

Students build the **core ray tracer loop** and solve basic ray–object intersections.

#### Learning objectives

By the end of this lab, students will be able to:

* Generate rays from a virtual camera
* Implement basic ray–sphere intersection tests

#### Key activities

* Generate camera rays (one ray per pixel)
* Implement ray–sphere intersection
* Output flat colour or surface normal

#### Visual outcome

* Coloured spheres
* Normal visualisation
* No lighting yet

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