Aligning Models

Troubleshooting
1

Can put two points on the model and get it to align with the camera or something?

This is what I want to do with it:

2

It’s truly easiest if the two points are already aligned along z… as in tipSight.x - buttSight.x = 0 and tipSight.y - buttSight.y = 0

And if tipSight.z - buttSight.z = positive value then the rotation to apply is just the camera rotation.

Edit: else step 1 is to figure out the model’s rotation necessary for the above conditions to be true… which is possible but not as trivial as if they are already lined up. So I thought I’d figure out the requirements first.

3

what? Little confused by what you mean

soz

4

Which part?

5

tipSight.z - buttSight.z = positive value, what does this mean
and tipSight and buttSight is what kind of object

6

Ok… how do you define the two points on your model? Because it seems you don’t have enough imagination to know what I mean from your picture.

So tell me SPECIFICALLY what you start with IN CODE.

7 
public void setViewModel(Gun g) {

    
this.viewModel = (Node) g.getViewModel();
viewModel.rotate(new Quaternion().fromAngleAxis(FastMath.PI  ,   new Vector3f(0,1,0)));
viewModel.setLocalTranslation(4, -12, -11);
viewNode.attachChild(viewModel);


}

I don’t know how to do the aligning part…

I have two nodes set up on the sight but thats all I got

8

And what do you call those? Because my names didn’t work for you.

9

backSight and frontSight

10

So, those would have been my buttSight and tipSight.

What is the value of frontSight.getLocalTranslation().subtract(backSight.getLocalTranslation())?

11

(0.0, 0.0, 19.0)

12

Great… so to ‘align’ the model all you have to do is like I said in the first post. Set the gun’s rotation to the same as the camera rotation.

And by set the gun’s rotation, I mean gun setLocalRotation() and by camera’s rotation I mean camera.getRotation().

g.getViewModel().setLocalRotation(camera.getRotation());

And as a bonus, if you want the gun sights to be in the middle of the screen then you will also want to move the model down:
g.getViewModel().move(0, -backSight.getLocalTranslation().y, 0);

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