Like in lots of other similar questions, I want to move an object forward in three.js based on its rotation. The difference is, I can't use object.translateZ. This is because I'm using a physics simulator and it will mess up if I update the object like that. Here is an example fiddle of my problem. Feel free to play around with my fiddle and add your updated version to your answer.

I would like the cube to move forward by updating mesh.position.x and mesh.position.z based on mesh.rotation.y.

To keep in mind, I've sometimes realized that three.js rotations are a little weird some times when accessing them using mesh.rotation.y.

Thanks!

Like in lots of other similar questions, I want to move an object forward in three.js based on its rotation. The difference is, I can't use object.translateZ. This is because I'm using a physics simulator and it will mess up if I update the object like that. Here is an example fiddle of my problem. Feel free to play around with my fiddle and add your updated version to your answer.

I would like the cube to move forward by updating mesh.position.x and mesh.position.z based on mesh.rotation.y.

To keep in mind, I've sometimes realized that three.js rotations are a little weird some times when accessing them using mesh.rotation.y.

Thanks!

• javascript
• three.js
• rotation

2 Answers 2

I would suggest using the mesh.getWorldDirection() to get a direction where you want to move your mesh. Then you can multiply it with a scalar to adjust movement speed.

direction = mesh.getWorldDirection();

mesh.position.add(direction.multiplyScalar(moveSpeed));

Fiddle: https://jsfiddle/k1swrxjr/1/

Good luck!

To move your mesh simply increment the value of the position in which you want your mesh to go in you animate() function instead of init function, example as follows:

function animate() {
        mesh.position.x += 0.1;
        requestAnimationFrame( animate );
        renderer.render( scene, camera );
    }

This example code will increase x position of your mesh by 0.1 every time animate() is run.