Negative ParallaxLayer mirroring freezes the game

system · March 10, 2016, 7:49pm


	Attention	Topic was automatically imported from the old Question2Answer platform.
	Asked By	Zylann
	Old Version	Published before Godot 3 was released.

I am creating a vertical scroller with a parallax background. I tried to make it mirror forward (-y in 2D), so I set Mirroring to (0,-512) because the texture has a height of 512 pixels.
However, when I do that the game freezes at the startup screen…

Is this a bug?

system · June 24, 2016, 5:19pm


	Reply From:	volzhs

There is PR for it now.

github.com/godotengine/godot

Improve parallax mirroring algorithm

godotengine:master ← RandomShaper:parallax-layer-fix-tidy

opened 05:08PM - 24 Jun 16 UTC

RandomShaper

+4 -14

Replaces the iterative approach currently used by the standard fmod() function. …Also fixes infinite looping that happens when the mirroring value is negative. * *: Negative mirroring can make things look better in the editor when your 2D game scrolls "backwards". For instance, if your level scrolls from bottom to top and you have placed a parallax layer so its bottom edge matches the bottom edge of the initial viewport, by setting a negative Y mirroring, the mirror piece will be placed above, on level space instead of outside. Not very important and achievable perhaps by transforms but at least we get rid of the infinite loop in case someone tries.