I recently implemented a new texture to replace the ugly looking rocky wall, and I know you guys love it when I go into detailed posts about the underlying mathematics of my systems.
As a point of reference, here’s what they looked like before.
Look at that, so ugly. Ech.
For the new walls, I wanted less overlap and more prominent cracks. For that, I decided to go with a bunch of hexagons with random vertices.
Here’s how that started out.
This is pretty much a map of the corresponding indices in an array for each hexagon. From this I figured out a formula to generate a list of the points that correspond to a given hexagon, and after that it was just case of actually generating this array of points, and randomizing their positions slightly.
Don’t worry about the 120 degress typo, it’s just. Just don’t
Anyway, here’s what it ended up looking like in the end, or at least the general shape.
And here it is in game. (notice how it blends on the corner, it’s pretty neat)
Now I don’t know about you, but that doesn’t look like much of a wall to me, it’s just too flat and joined with the floor.
But that’s where lighting comes in.
I also wrote a shader to draw a nice shadow along the wall edges, to give it that extra depth.
I did it by calculating the distance of the pixel from the wall and determining the red based on that, then taking the pixel with the highest red so as to have colliding wall shadows blend nicely. Finally, the opacity of the shadow is determined by the amount of red.
Now scroll back up to the top and look at how ugly that original wall was again.
Anyway, hope you’ve enjoyed this glance into the mathematics behind a wall shadow.
In other news, 7DRL is next week. Hype.
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