Transformation matrix

[fred.naar]

Hi,

I am trying to add a force to a BodyRigid in local coordinates using body.AddForce, but as I see it adds the forces in world coordinates not in local coordinates.

In Unity or Unreal you can convert from local to world coordinates transform.transformdirection

I tried using 

MathLib.Inverse4(body.Transform)

but I am not getting the expected results....

I am sure it is there somewhere but I can't find it...

thanks

Fred

 

Edited April 12, 2020 by fred.naar

[binstream]

This article might be helpful: https://developer.unigine.com/en/docs/2.11/code/fundamentals/matrix_transformations/index?rlang=cs

[fred.naar]

Thank you, I read this, it was quite useful.

After some trial and error here's the way to transform a vector from local to world:

 

        vec3 wf = f*(MathLib.Inverse(node.GetWorldRotation()));

        

 

[samuel.bruner]

This work as well
 

// Track the player rotation in world
		vec3 directionx = node.GetWorldDirection(MathLib.AXIS.X); // right vector rotated to world
		vec3 directiony = node.GetWorldDirection(MathLib.AXIS.Y); // witch direction player is facing

if (Input.IsKeyPressed(forward_key)) 
				{
				node.ObjectBodyRigid.AddForce(vec3.ZERO, directiony * force_multiplier * ifps);				
				}
			if (Input.IsKeyPressed(backward_key)) 
				{
				node.ObjectBodyRigid.AddForce(vec3.ZERO, -directiony * force_multiplier * ifps);	
				}
			if (Input.IsKeyPressed(right_key)) 
				{
				node.ObjectBodyRigid.AddForce(vec3.ZERO, directionx * force_multiplier * ifps);	
				}
			if (Input.IsKeyPressed(left_key)) 
				{
				node.ObjectBodyRigid.AddForce(vec3.ZERO, -directionx * force_multiplier * ifps);	
				}

 

Edited May 7, 2020 by samuel.bruner