from direct.showbase.ShowBase import ShowBase from panda3d.core import Vec3, Point3 class MyApp(ShowBase): def __init__(self): ShowBase.__init__(self) up = Vec3(0, 0, 1) calc = Point3(0, 0, 0) - Point3(0, 0, 0) calc.normalize() print(calc.angle_deg(up)) app = MyApp() app.run()
Shouldn’t the angle be 90? Or how can I get around it, in other cases it works correctly. Of course, I can add a check for the zero value of the vector and not make calculations. It would be nice if warnings about this behavior were noted somewhere in the manual.