19 lines
1 KiB
Markdown
19 lines
1 KiB
Markdown
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# Notes
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## Reminders
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- `wrap.fnl` is the "entrypoint" for the project.
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- Run the project via `make` or `love` (ex: `love .` from base directory)
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## Ray-Casting Basics
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Every frame, from left to right, a vertical slice is drawn. The slice can be a
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part of a texture, or a color. Generally, the slice is drawn the full height of
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the wall; half-walls are possible, and presumably so are windows. The slice to
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be drawn is determined by sending a ray from the camera (or camera plane) in the
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facing direction, until the ray intercepts with a wall. The walls, as well as
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most other level details, are provided in a 2-d array, generally of numbers. In
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this example, the number 0 represents open space, and every number above 0
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represents a wall with a specific texture. The initial way of determining the
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ray is using Euclidean geometry, but this can result in a fish-eye lens
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appearance. Lode's tutorial uses vectors to establish a camera plane from which
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all calculations are performed. This helps reduce the fish-eye appearance.
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