parent Transform.position unexpected behaviour when changing position

Question

Hello,

I'm having some trouble with an unexpected behaviour of changing the position of a gameobject.

I have a gameobject, called worldobject, which holds two components, WorldManager and WorldDrawManager. After the calculations of the world data is completed (i'm creating an icosphere), WorldManager calls WorldDrawManager to draw all world chunks (each face of the original icosahedron is a chunk) as new gameobjects whose parent is worldobject and position is Vector3.zero.

Now, everything works fine when the gameobject is at position (0,0,0), but when I change the position of said object (for example at 0,-100,0) the icosahedron gets STILL drawn around the (0,0,0) origin point. The chunk objects' positions are each shown as (0,100,0), even if I explicitly set them to Vector3.zero.

Inspecting worldobject before I start the game shows its gizmo at the correct position, but after I complete the world generation its gizmo is shown at (0,0,0) even if its position in the component is correctly set.

Is this a bug or am I doing something wrong?

Thanks in advance!

Answer 1

Best Answer

Answer by bpaynom · Feb 01, 2019 at 12:30 PM

Your are instantiating them using world position instead of your object relative position. You can

use transform.localPosition to set the position
calculate the desired position relative to the parent
positioning the parent at 0,0,0, then instantiate all objects, then move it again to wherever it was.

Your choice.

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Jacho_Mendt · Feb 01, 2019 at 07:15 PM 0

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The first option worked like a charm, but now I'm curious, why using position instead of localPosition didn't work? I thought it'd be fine.

Thank you for your answer tho, it helped a lot!

bpaynom Jacho_Mendt · Feb 01, 2019 at 08:16 PM 0

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The values shown in the inspector are localPosition values. One way to see the world values of an object is to unparent it, so the "parent" of that object is the scene. Then, those X,Y,Z values are world position values. I know at first is a bit confusing, but it's the way most 3D softwares work.

Jacho_Mendt bpaynom · Feb 02, 2019 at 09:48 AM 0

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This makes so much sense now, I didn't know that at all. Thank you!

parent Transform.position unexpected behaviour when changing position

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