Camera movement is not the same speed at different frame rates

Troubleshooting General Help
1 
   @Override
    public void update(float tpf) {

    if((cam.getWidth()*0.05)>inputManager.getCursorPosition().getX()&&(cam.getHeight()*0.05)>inputManager.getCursorPosition().getY()){
        MoveCam(LowerLeft);//左下
        MoveCamTime = 0;
    }else if((cam.getWidth()-(cam.getWidth()*0.05))<inputManager.getCursorPosition().getX()&&(cam.getHeight()*0.05)>inputManager.getCursorPosition().getY()){
        MoveCam(LowerRight);//右下
        MoveCamTime = 0;
    }else if((cam.getWidth()*0.05)>inputManager.getCursorPosition().getX()&&(cam.getHeight()-(cam.getHeight()*0.05))<inputManager.getCursorPosition().getY()){
        MoveCam(UpperLeft);//左上
        MoveCamTime = 0;
    }else if((cam.getWidth()-(cam.getWidth()*0.05))<inputManager.getCursorPosition().getX()&&(cam.getHeight()-(cam.getHeight()*0.05))<inputManager.getCursorPosition().getY()){
        MoveCam(UpperRight);//右上
        MoveCamTime = 0;
    }else if((cam.getWidth()*0.05)>inputManager.getCursorPosition().getX()){
        MoveCam(Left);//左
        MoveCamTime = 0;
    }else if((cam.getWidth()-(cam.getWidth()*0.05))<inputManager.getCursorPosition().getX()){
        MoveCam(Right);//右
        MoveCamTime = 0;
    }else if((cam.getHeight()*0.05)>inputManager.getCursorPosition().getY()){
        MoveCam(Backward);//后
        MoveCamTime = 0;
    }else if((cam.getHeight()-(cam.getHeight()*0.05))<inputManager.getCursorPosition().getY()){
        MoveCam(Up);//前
        MoveCamTime = 0;
    }
}

   private void MoveCam(String direction){
   switch(direction){

   case("Left"):
       cam.setLocation(camVector3f.addLocal(new Vector3f(1,0,0)));
    break;
   case("Right"):
       cam.setLocation(camVector3f.addLocal(new Vector3f(-1,0,0)));
    break;
   case("Up"):
        cam.setLocation(camVector3f.addLocal(new Vector3f(0,0,1)));
    break;
   case("Backward"):
        cam.setLocation(camVector3f.addLocal(new Vector3f(0,0,-1)));
    break;
   case("UpperLeft"):
        cam.setLocation(camVector3f.addLocal(new Vector3f(1,0,0)));
        cam.setLocation(camVector3f.addLocal(new Vector3f(0,0,1)));
    break;
   case("UpperRight"):
        cam.setLocation(camVector3f.addLocal(new Vector3f(-1,0,0)));
        cam.setLocation(camVector3f.addLocal(new Vector3f(0,0,1)));
    break;
   case("LowerLeft"):
        cam.setLocation(camVector3f.addLocal(new Vector3f(1,0,0)));
        cam.setLocation(camVector3f.addLocal(new Vector3f(0,0,-1)));
    break;
   case("LowerRight"):
        cam.setLocation(camVector3f.addLocal(new Vector3f(-1,0,0)));
        cam.setLocation(camVector3f.addLocal(new Vector3f(0,0,-1)));
    break;
   }
   
   }

This is the part of the code where I control the movement of the camera
I found that the camera moves at different speeds at different frame rates which puzzles me!

I’m hoping someone can help me see what the problem is.
Let me know if I need to provide more content.

Acknowledgements in advance

2

this is expected, pass tpf from public void update(float tpf) to MoveCam and multiply the Vector3f representing the direction by it eg.

       cam.setLocation(camVector3f.addLocal(new Vector3f(1,0,0).multLocal(tpf) ));

Tpf is the time since the last frame and will make your movement framerate independent

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3

Thanks for the quick reply and the tip I’m going to try it later

1 Like