Mouse look bug

Game Engine Game Engine Support and Discussion
1 
import bge


logic = bge.logic
mouse = logic.mouse


### CAMERA ###
def cam_orbit(cont):
    own = cont.owner
    scene = own.scene
    target = scene.objects[own["target"]]
    trackToTarget = cont.actuators["trackToTarget"]
    trackToTarget.object = target
    cont.activate(trackToTarget)
    
    if not "oldCursorPosition" in own:
        own["oldCursorPosition"] = [0.5, 0.5]
        mouse.position = (0.5, 0.5)
        
    x = (0.5 - mouse.position[0]) * own["sensitivity"]
    y = (0.5 - mouse.position[1]) * own["sensitivity"]
    
    deltaX = x
    deltaY = y
    
    target.applyRotation([-deltaY, 0, 0], True)
    target.applyRotation([0, 0, deltaX], False)
    
    mouse.position = (0.5, 0.5)

I’ve made this basic code. It’s supposed to work as mouse look orbit script. It works, but there is a massive problem. The object is rotating like if mouse was slightly down(e.g. like if it was 0.499), even though it’s at 0.5. I tried adjusting numbers up(like so: 0.50130519 or similar), but either the object kept rotating upwards, or started rotating downards, but it never stands still. What’s the reason of this issue and how to fix it?

2

0.499 might be 0.5 with loss of accuracy? Maybe if you create a buffer zone in the middle of the screen between 0.45 and 0.55 for both x and y coordinates, the mouse can rest there without affecting movement. Do this with:


if not mouse.position[0] > 0.45 and not mouse.position[0] < 0.55:
    if not mouse.position[1] > 0.45 and not mouse.position[1] < 0.55:

         target.applyRotation([-deltaY, 0, 0], True)
         target.applyRotation([0, 0, deltaX], False)
3

Thanks. Of course, 0.45 and 0.55 is overkill. The error is like 0.004 or something like that(not exact). I found that 0.505 and 0.495 is totally enaugh. Also, it’s working well for x axis and only y axis needs this error removal range.

Problem solved!:slight_smile: