Thanks for that. I will go through the whole video later but that at least covered the basic premise.
Essentially, due to the technique used for collision detection, tiny gaps in the geometry causes collision system to treat parts of the scene as having very thin walls that stretch to the top of the play space. Depending on if Mario's quarter steps align with this little gap means that a collision can be made despite it not being visible. Also explains why they impact Mario sometimes and not others.
Like throwing a marble through a mesh fence but you cannot see the fence. Odds are you will make it through but it is essentially chance.
Essentially, due to the technique used for collision detection, tiny gaps in the geometry causes collision system to treat parts of the scene as having very thin walls that stretch to the top of the play space. Depending on if Mario's quarter steps align with this little gap means that a collision can be made despite it not being visible. Also explains why they impact Mario sometimes and not others.
Like throwing a marble through a mesh fence but you cannot see the fence. Odds are you will make it through but it is essentially chance.