Sweeping Splines

This project is generating 3D shapes by drawing splines with modern OpenGL in C++. These polygon curves are used as input for translational or rotational sweeping to create three dimentional shapes. A user can explore these artifacts using controls to zoom in, move around and rotate the model.

More artsy shapes on rotation-wo-radians branch :

Setup

It was tested on Arch Linux.

Dependencies

# Arch Linux
sudo pacman -S glew glm glfw-x11 mesa-demos

Compiling:

make arch       # Arch Linux
make linux      # GNU / Linux (general)

Usage

An example command:

./run.sh <name>

Controls

[Splines Drawing]
    
    mouse-l             marks control points in the window
    scroll              zoom in / zoom out (z)

    enter x 1           generates spline
    enter x 2           goes to next spline
    
    s                   generate spline
    l                   switch to previous spline
    r                   switch to next spline
    c                   print cursor coordinates
    
    backspace           resets the application

[3D Shape]
    
    mouse-l + move      rotate on (x, y)
    
    arrows              rotate on (x, y)
    
    w                   move up
    s                   move down
    a                   move left
    d                   move right

    t                   display triangles
    l                   display lines
    p                   display points

Roadmap

Requierements

• User decides whether to have a translational “T” or rotational sweep “R” (through console)

• The user then marks control points in the window with the mouse (assume XZ plane, Y=0). The X and Z coordinates of each point should then relate to the window coordinates where the user has clicked.

• User can then press “Enter” which computes and draws the spline.

  • If the user selected translational sweep, then repeat steps 2-3 for the second set of control points resulting in two separate splines (this time assume XY plane, Z=0). The X and Y coordinates of each point should then relate to the window coordinates where the user has clicked.

• Write the points of the resulting spline/s to an output file. The output file should have the same description format as Assignment #1.

• Load the output file in Assignment #1 and generate smooth surfaces based on the input splines.

Sub-requierements

• Create a GLFW window of size 800x800 with double buffering support

• The application should handle window resize events

• Use an orthographic projection for simplicity

• Splines : Generate indices to draw lines (l)

• Splines : don't add artificial points before 0 & after n - 1 points and make those red

Extra

• Compute the sweep surfaces

• Use the subdivision algorithm taking into account the curvature (rather than distance) for drawing the curve

Authors

Vsevolod (Seva) Ivanov - seva@tumahn.net