# Computer Graphics Labs
For National University of Singapore (NUS) module CS3241 Computer Graphics.

All programs are written in C++ for OpenGL.

Inside each folder, you can find:
* The final product as an executable
* A video demonstrating the final product
* PDF lab sheet with the questions and instructions

## Lab 1
**Summary:** draws discs of random colour and size when a user left clicks. These discs bounce around the window (reflected at edges) at initialised random speeds. Window can be resized.

Learning Objectives:
* Basic structure of an OpenGL program
* Basic OpenGL functions such as glBegin and glEnd, glColor and glOrtho
* User input and interaction with GLUT callback
* GLUT timer callback to control FPS
* Optimisations such as pre-computing trigonometric values for vertex positions, double-buffering and glutPostRedisplay

![alt text](./Lab1_bouncing_balls/Lab1-demo-pic.png)

## Lab 2
**Summary:** draws cars of random colour that orbit around a spherical planet at initialised random speeds. User can adjust the camera's position - left, right, up, down, zoom in and zoom out. Window can be resized.

Learning Objectives:
* View transformations (camera position and orientation) - gluLookAt and matrix transformations
* Perspective viewing - gluPerspective 
* OpenGL transformations for modeling a more complex object - glutSolidTorus, gutSolidCube, glPushMatrix and glPopMatrix
* OpenGL transformations for animation - using variables like angular position that are updated and re-rendered every iteration

![alt text](./Lab2_orbiting_cars/Lab2-demo-pic.png)