Godot 4.3: vines don't work anymore

[NathanLovato]

The vines demo is meant to produce a tapering effect like this but doesn't work in Godot 4.3 currently:

This needs to be investigated.

[HubbleCommand]

I took a quick peek at this again, and it seems like inversing the +/- operators fixes the worst of it.

So instead of

void vertex() {
	float uneven_growth = (growth * 2.0 - 1.0) - COLOR.r;
	displacement = UV.x + min(0.0, uneven_growth);
	// subtract original model's thickness
	VERTEX -= NORMAL * 0.1;
	VERTEX += NORMAL * thickness * displacement;
}

Use

	VERTEX += NORMAL * 0.1;
	VERTEX -= NORMAL * thickness * displacement;