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wip readme presentation

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2024-01-20 15:35:52 +01:00
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README.md
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@@ -54,6 +54,39 @@ And change the map itself :
# raycasting
---
Raycasting is a technic that creates the illusion of 3D with very low computational power.
This technic has the hability to not show hidden area by design, which is a great simplification for rendering.
How it works :
1. first you determine the position and orientation of the viewer in a plan,
![](assets/raycast_step1.png)
2. then you cast a ray until it reaches a wall
![](assets/raycast_step2.png)
3. you can now trace the vertical line on the 3D view
![](assets/raycast_step3.png)
4. the height of the wall is inversely proportional to the length of the ray : the closer the wall, the heigher it is
![](assets/raycast_step4.png)
5. finally, if the rays scan the whole picture, you see the perspective appears
![](assets/raycast_steps.gif)
6. but you can also see that walls are rounded, like a fish eye effect. It's because rays change length while scanning the wall, so we must apply a correction to the angle
![](assets/raycast_steps_round.gif)
example of raycasting in action while construction of the project :
![example of raycasting during the construction of the project](assets/cube3d_raycasting.gif)