How can I set direction for the Ray to check collision in front of character?


#1

1-how can I set direction for the Ray to check collision in front of character?
2-and rotate the Ray by changing rotation of character?

i can not use camera direction because it is from Top and the game genre is RTS.


#2

Probably easier to direct you to a conversation you’ll probably have.


#3

Could you do something like:

	Ray ray = new Ray(this.model.getWorldTranslation(), 
        model.getWorldRotation().getRotationColumn(2));

This will get the direction in x/z planes (i.e. not up or down).


#4

I know some of the tutorials do this but I think it’s so much better if you guys stop using this confusing magic incantation when the simpler way is to just multiply the direction you want.

model.getWorldRotation().mult(Vector3f.UNIT_Z);

…that teaches you something useful.

The rotation column BS is just magic unless you understand a whole bunch of other things about how rotation matrixes decompose into axes vectors, etc… no need to know all of that.

“If you want to know what the forward direction is for some character then multiple the general forward direction by their rotation.” Which works for side direction, up direction, down direction, back direction, etc…

I really wish we could just get rid of the references to the getRotationColumn() stuff. Folks asking these super basic 3D math questions are confused enough already.