In this report I am going to describe the implementation of a simple curve manipolation application, developed as a fullment of the second project for the course of Principles of Computer Graphics. The report is organized as follows: Section 1 introduces the problem and what the application should implement, Section 2 describes the architecture of the program, Section 3 explains some foundamental parts of the source code and nally Section 4 illustrates how to use the application together with some screenshots and examples.

1. Principles of computer
graphics
Final project assignment – Michele Segata

2. The project
Develop an application to
• Draw and manage different type of curves (control
points dragging, use of composite curves, etc…)
• Put an image as background to see which curve is best
suited
• Use a file as a source of points and display the curves
using those points

3. A first screenshot before starting

4. Application architecture

5. Picking procedure

6. Application with background image

7. Sampling of a picture

8. Application with sampled points

9. Tools used
" Only OpenGL and the graphic library developed for
first assignment
" Why? For fun and better understanding

10. First assignment – Brief description
" gl_2d_geometry.h
" gl_3d_geometry.h
" gl_curve.h
" gl_material.h
" gl_mempool.h
" gl_mesh.h

11. First assignment – Brief description (2)
" gl_mouse.h
" gl_physic.h
" gl_physic_law.h
" gl_printf.h
" gl_rendering.h
" gl_scenegraph.h

12. First assignment – Brief description (3)
" gl_selection.h
" gl_tga.h
" gl_transformation.h
" gl_util.h

13. First assignment – Few screenshots
Convex hull example

14. First assignment – Few screenshots
(a) Face normals (b) Vertex normals (c) Mixed approach
Solid pyramid with 3 different normals algorithms

15. First assignment – Few screenshots
Spheres at different resolutions

16. First assignment – Few screenshots
Automatic texture application on sphere