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Miloslav Ciz 2024-03-08 16:56:58 +01:00
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raycasting.md
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@ -281,7 +281,7 @@ int main(void)
How to make this more advanced? Here are some hints and tips:
- **textured walls**: This is pretty simply, the ray hit basically gives us a horizontal texturing coordinate, and we simply stretch the texture vertically to fit the wall. I.e. when the ray hits a wall, we take the hit coordinate along the principal axis of the wall (e.g. for vertical hit we take the Y coordinate) and [mod](mod.md) it by the fixed point unit which will give us the texturing coordinate. This coordinate tells us the column of the texture that the rendered column shall have; we read this texture column and render it stretched vertically to fit the column height given by the perspective. Note that for [cache](cache.md) friendliness ([optimization](optimization.md)) textures should be stored column-wide in memory as during rendering we'll be reading the texture by columns (row-wise stored textures would make us jump wide distances in the memory which CPU caches don't like).
- **textured floor/ceiling**: Something aking [mode7](mode7.md) rendering can be used.
- **textured floor/ceiling**: Something akin [mode7](mode7.md) rendering can be used.
- **sliding door**: TODO
- **jumping**: Camera can easily be shifted up and down. If we are to place the camera e.g. one fixed point unit above its original position, then for each column we render we compute, with perspective applied to this one fixed point unit (the same way with which we determine the column size on the screen) the vertical screen-space offset of the wall and render this wall column that many pixel lower.
- **looking up/down**: Correct view of a camera that's slightly tilted up/down can't be achieved (at least not in a reasonably simple way), but there's a simple trick for faking it -- camera shearing. Shearing literally just shifts the rendered view vertically, i.e. if we're to look a bit up, we render that same way as usual but start higher up on the screen (in the part of the rendered image that's normally above the screen and not visible), so that the vertical center of the screen will be shifted downwards. For smaller angles this looks [good enough](good_enough.md).