A program that reads obj files and renders them in a window.
The goal with the project was to render a Utah-teapot in a window using only code written myself. I was mostly successful in doing this however i had to do some research and learn about projection matrices as well as freshen up on cross products.
The program is fairly limited in the files it can parse and it will not be able to render all .obj files. For a file to function it cannot contain normal data and the faces must be triangles. see the example below for a simple cube.
This file works:
o Cube
v 0.0 0.0 0.0
v 0.0 0.0 1.0
v 0.0 1.0 0.0
v 0.0 1.0 1.0
v 1.0 0.0 0.0
v 1.0 0.0 1.0
v 1.0 1.0 0.0
v 1.0 1.0 1.0
f 1 3 5
f 3 7 5
f 5 7 6
f 7 8 6
f 6 8 2
f 8 4 2
f 2 4 1
f 4 3 1
f 3 4 8
f 8 7 3
f 2 1 5
f 5 6 2
This file does not:
o Cube
v 0.0 0.0 0.0
v 0.0 0.0 1.0
v 0.0 1.0 0.0
v 0.0 1.0 1.0
v 1.0 0.0 0.0
v 1.0 0.0 1.0
v 1.0 1.0 0.0
v 1.0 1.0 1.0
f 1 3 5 7
f 5 7 6 8
f 6 8 2 4
f 2 4 1 3
f 3 4 8 7
f 2 1 5 6
The lines begining with a 'f' in a .obj file represents a face and they have to be in the format f P1 P2 P3 and not f P1 P2 P3 ... Pn or f P1/N1 P2/N2 P3/N3.
$ ./3D-graphics <filename.obj>
$ ./3D-graphics <filename.obj> rand (for random colors)
$ ./3D-graphics <filename.obj> <FOREGROUND_COLOR> (RED, GREEN, BLUE)
$ ./3D-graphics <filename.obj> <FOREGROUND_COLOR> <BACKGROUND_COLOR>
$ ./3D-graphics <filename.obj> <FOREGROUND_RGB> (1,0.7,0.3) values between 1 and 0
$ ./3D-graphics <filename.obj> <FOREGROUND_RGB> <BACKGROUND_RGB>
| Key | Action, enable/dissable |
|---|---|
| H | wireframe |
| J | render with color |
| L | render with light |
| k | dissable triangle sorting |
| W/UP | move light source up |
| A/LEFT | move light source left |
| S/DOWN | move light source down |
| D/RIGHT | move light source right |
| left mouse | rotate object |
| SHIFT+ left mouse | move object |
| scroll wheel | move object in Z dir |
