wip readme presentation

README.md

@@ -78,13 +78,17 @@ How it works :
 
 5. finally, if the rays scan the whole picture, you see the perspective appears
 
-![](assets/raycast_steps.gif)
+![](assets/raycast_steps_round.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)
+![](assets/raycast_steps.gif)
 
-example of raycasting in action while construction of the project :
+7. a more realistic step by step example looks like this :
+
+![](assets/raycast_explanation.gif)
+
+example of raycasting with errors in action while construction of the project :
 
 ![example of raycasting during the construction of the project](assets/cube3d_raycasting.gif)