koobas.hobune.stream
Rotate around object at a given angle
Hello, new to Unity here. Looked around everywhere but could't find and answer. Thanks in advance for the help. I'm trying to rotate a camera around and object as I drag the mouse. The more I drag the mouse the faster it rotates. I don't want it to rotate smoothly, I want it to rotate on increments of 45 degrees. I don't know how to find the camera position values at a given angle. (I cannot parent the camera to the object and rotate the object -- would require days of rewriting camera scripts). I DO know how to round/snap individual attributes after I find the correct position at a given angle. Here is the desired behavior except that it doesn't snap: (written in boo)
import UnityEngine
class cameraRotation (MonoBehaviour):
public object_to_rotate_around as Transform
private main_cam as Camera
private initial_mouse_click as Vector3
def Start ():
main_cam = Camera.main
//initial_mouse_click = Input.mousePosition
def Update ():
if Input.GetMouseButtonDown(0):
initial_mouse_click = Input.mousePosition
elif Input.GetMouseButton(0):
mouse_delta = Input.mousePosition - initial_mouse_click
main_cam.transform.RotateAround(object_to_rotate_around.position, Vector3.up, mouse_delta.x * 0.05)
Hi. I'm not a Boo programmer, so please excuse the syntax errors ;) Basically you want to look for the modulus operator and apply. Change:
elif Input.GetMouseButton(0):
mouse_delta = Input.mousePosition - initial_mouse_click
main_cam.transform.RotateAround(object_to_rotate_around.position, Vector3.up, mouse_delta.x * 0.05)
to
elif Input.GetMouseButton(0):
mouse_delta = Input.mousePosition - initial_mouse_click
mouse_delta.x *= 0.05f;
stored += mouse_delta.x;
rem = stored % 22.5f;
actualChange = stored-rem;
stored = rem;
main_cam.transform.RotateAround(object_to_rotate_around.position, Vector3.up, actualChange )
//You need to also declare float stored = 0 and float actualChange = 0; at the op of your program
For reference, here's my test code in c# which I used to check it would work. Obviously my cube and cylinder will not work unless they're in your project ;)
Vector3 initial_mouse_click=Vector3.zero;
float stored = 0;
void Update () {
if (Input.GetMouseButtonDown(0))
{
initial_mouse_click = Input.mousePosition;
}
else if (Input.GetMouseButton(0))
{
Vector3 mouse_delta = Input.mousePosition - initial_mouse_click;
GameObject go = GameObject.Find("Cylinder");
GameObject cb = GameObject.Find("Cube");
mouse_delta.x *= 0.05f;
stored += mouse_delta.x;
float rem = stored % 22.5f;
float actualChange = stored-rem;
stored = rem;
go.transform.RotateAround(cb.transform.position, Vector3.up, actualChange);//mouse_delta.x);
}
}
I apologise if I've used too many variables. It's 1am, I'm tired and just don't care anymore ;)
Edit: Rearranged code to retain data lifetime
This works great! thank you!
This code should be outside of the update function:
Vector3 initial_mouse_click=Vector3.zero;
float stored = 0;
float actualChange = 0;
Updated the answer thanks. The float actualChange can still be declared local, because it's value does need to be retained. The answer could now be accepted
