Negative velocity makes instantiated object just stay in place

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1

Godot Version

4.7.2

Question

ive tried to give an instantiated object random velocity and it works fine if it the velocity is positive but when velocity is negative ( multiplied by *=1 ) it just stays in place instead

		for i in range(1):
			randomize()
			var InstancePR = FR.instantiate()
			var Velocity1 = randi_range(20,300)
			var way = randi_range(1,2)
			InstancePR.velocity.x = Velocity1
			print("#########")
			if way == 2:
				InstancePR.velocity.x *= -1
				print('was reversed')
			else:
				print("wasnt reversed")
			print("InstancePR.velocity.x : ",InstancePR.velocity.x)
			print("Velocity1 : ",Velocity1)
			print("way : ",way)
			add_child(InstancePR)

when it should’ve been reversed
the console output :
was reversed
InstancePR.velocity.x : -125.0
Velocity1 : 125
way : 2
but just stayed in pace
( im sorry for the post being a bit cut off i acidently clicked publish before it was done and you cant edit pending ones )

2

Try this:

var InstancePR = FR.instantiate()
InstancePR.global_position = global_position # Give it a starting position

var Velocity1 = randi_range(20, 300)
var way = randi_range(1, 2)

if way == 2:
    InstancePR.velocity.x = -Velocity1 # Directly assign the negative value
else:
    InstancePR.velocity.x = Velocity1

add_child(InstancePR)
3

so changed code to this

		for i in range(1):
			randomize()
			var InstancePR = FR.instantiate()
			var Velocity1 = randi_range(20,300)
			var way = randi_range(1,2)
			print("#########")
			if way == 2:
				InstancePR.velocity.x = -Velocity1
				print('was reversed')
			else:
				InstancePR.velocity.x = Velocity1
				print("wasnt reversed")
			print("InstancePR.velocity.x : ",InstancePR.velocity.x)
			print("Velocity1 : ",Velocity1)
			print("way : ",way)
			add_child(InstancePR)

( without all the prints [ i think its easier to read ] )

		for i in range(1):
			randomize()
			var InstancePR = FR.instantiate()
			var Velocity1 = randi_range(20,300)
			var way = randi_range(1,2)
			if way == 2:
				InstancePR.velocity.x = -Velocity1
			else:
				InstancePR.velocity.x = Velocity1
			add_child(InstancePR)

i removed to
InstancePR.global_position = global_position
since it made it instantiate somewhere else and not at the parent’s location
it still went right as it should

[ image with a fragment of rock a bit right i cant have 2 atachments ]

#########
wasnt reversed
InstancePR.velocity.x : 147.0
Velocity1 : 147
way : 1

but stayed in the middle when it was supposed to go left

image
#########
was reversed
InstancePR.velocity.x : -125.0
Velocity1 : 125
way : 2

so the way it was reversed wasnt the issue

4

Setting global position if the node is not in the scene tree makes no sense and will not behave as expected. Always do it after you call add_child(). In this case It’d be best to call add_child() immediately after the instantiation.

5

changed to call add_child immediately after the instantiation also added back the
InstancePR.global_position = global_position
line after the add_child() it does not break it this time but still dosent fix it or do anything really issue also stayed still

6

Post the code you now have.

7 
	for i in range(10):
		randomize()
		var InstancePR = FR.instantiate()
		add_child(InstancePR)
		InstancePR.global_position = global_position
		var Velocity1 = randi_range(20,300)
		var way = randi_range(1,2)
		if way == 2:
			InstancePR.velocity.x = -Velocity1
			print('was reversed')
		else:
			InstancePR.velocity.x = Velocity1
			print("wasnt reversed")
		print("InstancePR.velocity.x : ",InstancePR.velocity.x)
		print("Velocity1 : ",Velocity1)
		print("way : ",way)

here

the results are the same as before

8

Post the instance’s code. Print the velocity from its processing function.

9

ohhh yeah i forgot that might have been the issue
there was a check to stop it if the velocity was to low but velocity.x wasnt abs()
thank you for reminding me about that part