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This was a long assignment mostly because I decided to learn vertex buffers
once and for all. This project is 100% delicious Haskell goodness with 0% fixed
pipeline. Everything is OpenGL 4 complient right down to using only triangles,
which means I had all kinds of fun reinventing the wheel reimplementing vector
math and looking up algorithms for creating a lookat matrix using GLM as a
reference.
I honestly would not be entirely surprised if I am one of the only people to
actually have accomplished this. Not sure if this is a good thing or a bad
thing, but whatever it is, I managed to put together a proof of concept.
The good news is that I know not only understand how vertex buffers work, but I
also understand OpenGL much better than I used to. Once I got simple lighting
to work, this project was quite a bit of fun.
This project is a mimic of the Blue Marble example, except with some
adjustments. First, the moon is in the scene as a test to see if I could make
another object in the scene easily. Both the Earth and the Moon are bump
mapped, correctly I think. I pass in a random texture to add randomness to the
shader for when I decide when to turn on and off lights.
The earth has clouds which rotate faster than the Earth itself so they appear
to be above the surface. The clouds also cast shadows on to the earth (fixed
offset, not actually calculated based on the light vector :-( ) And when the
shadows appear over land, there is a random chance that a light may turn on,
after all, people turn on lights during a storm.
I also use the noise texture to have each light alternate between two colors
to give the appearance of twinkling.
I realize the background texture does not move with the camera, this is by
design. I wanted to try to draw a scene with a completely different model view
matrix and projection matrix in the same rendering. It worked.
To compile run make,
run with
./jora2470_hw8
Controls:
UP/DOWN/LEFT/RIGHT: Move camera around center
w/s: zoom in and out.
n: change to random bump map
=/-: speed up/slow down time
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