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Graphics_OpenGL

OpenGL computer graphic project in 2020

Spline Visualization of Bird Model

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This project parses the data file to utilize the coordinates of control points to implement B-Spline and Catmull-Rom spline.

You can draw splines using the draw_splines, splines, b_spline, and catmull_rom functions in main.py.

Running bird_model/main_with_cps.py will visualize the control points and the lines connecting them.

You can execute draw_surface function to visualize the swept surface as a polygonal mesh.

Operation of the Visualization Window:
  • Change the viewpoint direction by clicking and dragging.
  • Translate the viewpoint left with the 'a' key, right with the 'd' key.
  • Translate the viewpoint up with the 'q' key, down with the 'e' key.
  • Translate the viewpoint forward with the 'w' key, backward with the 's' key (dolly in / out).
  • Perform zoom in / out with the shift+w and shift+s keys.
  • Press the 'esc' key to exit the program.

Scene Rendering with Implicit Surfaces and Polygonal Objects

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The scene is comprised of implicit surfaces (spheres) and polygonal objects (bird, pear, and leafs).

Each object in the scene has specific material properties as listed below:

Material Description
Yellow rubber Small sphere
Emerald Sphere
Black plastic Sphere
Pearl Bottom flat sphere
Ruby Used for pear and bird
Silver Right mirroring sphere
Jade Background leafs
Light Sources Positions
  • LIGHT0: x: 0, y: 90, z: -90
  • LIGHT1: x: -10, y: 0, z: 0
  • LIGHT2: x: 10, y: 0, z: 0
  • LIGHT3: x: 0, y: 0, z: -60
Operation of the Visualization Window:

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  • To execute the visualization window, run python bird_scene/main.py in the terminal.
  • You can change the viewpoint direction by clicking and dragging.
  • Use the 'a' key to translate the viewpoint to the left, and the 'd' key to the right.
  • Press 'q' to translate the viewpoint upwards, and 'e' to translate it downwards.
  • Use the 'w' key to move the viewpoint forward, and 's' key to move it backward (dolly in / out).
  • Zoom in or out by pressing 'shift + w' or 'shift + s'.
  • Press 'esc' to exit the program.

Ray Tracing

  • Implemented ray tracing for the spheres, following the composition of previous materials:
    • Yellow rubber (yellow small sphere)
    • Emerald (cyan sphere)
    • Black plastic (black sphere)
    • Silver (large sphere)

Ray Tracing Polygons:

  • Represented polygons in the form of cuboids and applied ray tracing.
  • Utilized leather-like material composition.

Recursive Reflection:

  • Applied reflection to all objects, recursively reflecting each other's light.

Texture Mapped Spheres and Polygons:

  • Displayed a grid pattern on the ground plane.

Phong Illumination:

  • Applied Phong illumination to all objects, incorporating three light characteristics.

    The properties of the applied materials are as follows:

Material Ambient1 Ambient2 Ambient3 Diffuse1 Diffuse2 Diffuse3 Specular1 Specular2 Specular3 Shininess
Emerald 0.0215 0.1745 0.0215 0.0756 0.6142 0.0756 0.633 0.72781 0.633 0.6
Jade 0.135 0.2225 0.1575 0.54 0.89 0.63 0.31622 0.31622 0.31622 0.1
Pearl 0.25 0.2072 0.2072 0.2072 0.829 0.829 0.29664 0.29664 0.29664 0.088
Ruby 0.1745 0.0117 0.0117 0.6142 0.0413 0.0413 0.72781 0.62695 0.62695 0.6
Silver 0.1922 0.1922 0.1922 0.5075 0.5075 0.5075 0.50827 0.50827 0.50827 0.4
Yellow Rubber 0.05 0.05 0.0 0.5 0.5 0.4 0.7 0.7 0.04 0.078125
Representative pictures:

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