In my game I have pickaxes which the players use to mine ores. One pickaxe in particular has rotating cogs on the pickaxe itself. These cogs are .Massless = true, and they are rotated using a HingeConstraint set to ActuatorType = Motor. The pickaxe is welded to the player’s right hand, and then an animation is played when they mine.
I was expecting Massless parts to not have any impact on physics at all.
However, when the player is mining with this pickaxe their character is moved around.
As you can see in the gif above, the first pickaxe causes the player to move around while the second does not. (The slight movement you see is slight camera shake when a block is mined.)
This happens to everyone who uses this pickaxe, both in live and in studio.
Here is the pickaxe which causes the issues:
BuggedPickaxe.rbxm (37.4 KB)
In-game I simply weld it to the character’s RightHand and then play the pickaxe animation.