Project 2a ©Jorg Peters

Points: 35

Purpose

Learn how to use affine transformations to position objects in 3-space

Resources

OpenGL Transformations and Matrices - Moving/scaling/rotating objects
OpenGL Shading - Lighting up the scene
GLFW Input Handling - adding keyboard inputs
GLM - Convenient OpenGL Mathematics library
GLSL Data Types - Useful to know for shader programming

Set Up

Use one of: OpenGL or webGL
For openGL use this code base
For webGL use this code base
The object loader (modified source files) placed into TUT/common will help for openGL but may need to be modified. (always backup original files: rebuild may break other tutorials)

Task 1: Grid

Points: 5

Draw an integer grid on the Y=0-plane for the rectangle (-5,0,-5) to (+5,0,+5).
Draw the positive X axis in red, the Y axis in green and the Z axis in blue. Only draw the positive portion of each axis, of length 5.

Task 2: Camera Rotations

Points: 5

Use Perspective projection

Place the camera so you can see the whole scene: use glm::LookAt to generate the View matrix.

Key C selects the camera.

Keys ← and → move the camera along the blue circle parallel to the equator.

Keys ↑ and ↓ rotate the camera along the red circle orthogonal to the equator.

Choose the "up" direction so the camera always points to the origin.

Task 3: Draw the robot arm

Points: 25

The robot arm consists of the following parts:

Base: truncated tetrahedron placed on the x-z-plane
Arm1: rectangular box emmanating from and hinged at the center of Base.
Joint: dodecahedron of appropriate radius at the other end of Arm1.
Arm2: cylinder connected to the center of Joint.

Create triangulated objects in the .obj format, e.g. by using Blender. Hint: generate correct normals for later use.

To load .obj files exported with Blender:
tinyobjloader (usage best learned by looking at the examples on github) or
the supplied void loadObject(char* file, glm::vec4 color, Vertex * &out_Vertices, GLushort* &out_Indices, int ObjectId) function to load your objects.

Call void createVAOs(Vertex Vertices[], unsigned short Indices[], int ObjectId)
or find alternative online

WHAT TO SUBMIT

Your modified source files (cpp, shader, html, obj, as appropriate)
A link to a screen capture of your running program showcasing the implementation of all of the tasks using recordit (Mac, Win) or similar software.
Filepaths to load models must be relative to the source directory (no absolute paths specific to your computer).
openGL: Use a "models" folder within the top-most level of the source repo ("ogl-master"). If you need to deviate specify the location in the readme file.
WebGL: store models in the `resources' folder parallel to the .html files. Otherwise, you must specify the location in the readme file.