How to apply basic 2D forwards momentum? | Godot Café | Page 1

onyx shard Mar 10, 2023, 8:08 AM

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for top-down tank controls, i want to apply or append a chosen momentum relative to the rotation of its node rotation. how do i do such a thing?

old pewter Mar 10, 2023, 8:27 AM

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Angular Momentum is kind of mass for rotation. Is that what you want?

Or add_torque?

https://godotengine.org/qa/45579/adding-torque-around-a-local-axis

Adding torque around a local axis - Godot Engine - Q&A

Hey, I have a spaceship that needs to be able to move around the world. Currently the ship can ... do I apply torque around the ship's local axes?

onyx shard Mar 10, 2023, 8:36 AM

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i meant more like an Asteroids-like movement for a CharacterBody2D

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i know there's self.rotate() to handle steering, i just don't know how to apply a force to a chosen direction without individually dealing with velocity.x and velocity.y individually

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btw the editor tells me there's no apply_torque() or add_torque() in neither RigidBody or CharacterBody

onyx shard Mar 10, 2023, 9:22 AM

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..i figured it out

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just invoke a rotation of a Vector2 and apply that to the speed you'll eventually use

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so the code i made looks something like

Vector2(torque, 0).rotated(self.rotation)

old pewter Mar 10, 2023, 9:26 AM

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Torque is in this example https://docs.godotengine.org/en/latest/tutorials/physics/physics_introduction.html#using-rigidbody2d

Godot Engine documentation

Physics introduction

In game development, you often need to know when two objects in the game intersect or come into contact. This is known as collision detection. When a collision is detected, you typically want somet...

onyx shard Mar 10, 2023, 9:32 AM

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i'll play around with those at some point :3

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but thank you for the help!

#How to apply basic 2D forwards momentum?