I'm working on an app that performs geolocalization over the camera stream of the iPhone. I use the compass to figure out where to put the icons and information onto the the camera layer. If I rotate the device around yaw axis everything works fine.
However, when I roll the iPhone all the information on screen goes away. That's because when you roll the device the compass orientation also changes. However, there are apps like Layar or Wikitude that allow roll rotation without losing focus on the visual items you have onto the camera layer. That way, these apps allow smooth transition between portrait orientation to landscape orientation.
How they achieve that? How can I compensate the roll rotation of the device to keep information on screen?
By the way, the ARKit framework has the same problem as me.
Thanks.
If you are in 2D maybe it is enough to take the point you are calculating from camera field view and offset heading, calculate the distance to the center of the screen, and use that distance as a radius for a circle to do x += r*cos, y += r*sin with -roll as the angle, so the object moves in a circle against the roll. Then you just have to counter rotate the image itself with a transform (CGAffineTransformMakeRotation) to keep it vertical.
Related
I am developing an augmented reality application that tracks an object via camera (real object, using Vuforia), my aim is to detect the distance it pass.
I am using unity + Vuforia.
For each frame, I calculate the distance between the first position and the current position (Vector calculating).
But I got wrong position/s details, and camera movements affect the result.
(I don't want to take the camera offset in account)
any solution?
for more clearing I want to implement this experience: (video):
https://youtu.be/-c5GiXuATh4
From the comments and the question i understood problem is using camera as origin. This means at all frames of your application camera will be origin and the position of all trackables will be calculated relative to camera. Therefore, even though if you do not move your target, it's position will change because of camera movement.
To eliminate this problem i would recommend using extended tracking. This will minimize the impact of camera movement to position of your target. You can try and test this by adding a trail renderer to your image and you will see your image will stay at a certain position regardless of camera movement.
I have simulated a rotating cube filled with particles by moving the gravity vector rather than changing all of the geometry. I want to use the ParaView animation tools to rotate the camera to keep the gravity vector pointing down so it all looks right. When moving the camera (not animations) I would use the rotate 90 degrees tools.
How would I achieve this effect for an animation?
EDIT:
I have done it using a video editor as an extra step after ParaView, this is the effect I am going for: https://youtu.be/rym2fdKkPps
You cannot animate GUI button usage with animation. However you can animate camera position and orientation as finely as you want.
Try adding a camera track to the animation track of type "Interpolate Camera Location".
Add the two positions you want and set the time to be very close.
I am developing an augmented reality app for Project Tango using Unity3d.
Since I want to have virtual object interact with the real world, I use the Meshing with Physics scene from the examples as my basis and placed the Tango AR Camera prefab inside of the Tango Delta Camera (at the relative position (0,0,0)).
I found out, that I have to rotate the AR Camera up by about 17deg, so the Dynamic mesh matches the room, however there is still a significant offset to the live preview from the camera.
I was wondering, if anyone who had to deal with this before could share his solution to aligning the Dynamic Mesh with the real world.
How can I align the virtual world with the camera image?
I'm having similar issues. It looks like this is related to a couple of previously-answered questions:
Point cloud rendered only partially
Point Cloud Unity example only renders points for the upper half of display
You need to take into account the color camera offset from the device origin, which requires you to get the color camera pose relative to the device. You can't do this directly, but you can get the device in the IMU frame, and also the color camera in the IMU frame, to work out the color camera in the device frame. The links above show example code.
You should be looking at something like (in unity coordinates) a (0.061, 0.004, -0.001) offset and a 13 degree rotation up around the x axis.
When I try to use the examples, I get broken rotations, so take these numbers with a pinch of salt. I'm also seeing small rotations around y and z, which don't match with what I'd expect.
here's a weird question,
Is there a way to inverse the device orientation of the iPhone in cocos2d?
ex:
if the device is held in a landscape left position, i want the screen to show the landscape right and vice-versa.
so basically to let the device work in the opposite way of its intended use.
Thank you.
If you're creating a game where you want to invert the gravity of the world, I'd suggest you doing this without tweaking device orientation, but by changing gravity vector direction instead.
I'm trying to create a chipmunk space with a bouncing ball.(Example seen here)
Currently my device is running in Landscape mode. So according to cocos2D everything is all right. When adding Sprites they orient to landscape mode.
[director setDeviceOrientation:kCCDeviceOrientationLandscapeLeft];
The only problem is that the device orientation is screwed up when using chipmunk right now. When tilting the ipad towards the upper-left corner, my 'bouncing ball' moves towards the upper-right corner.
Is there a way to rotate a chipmunk space manually?
Or is there some other way to set rotation within a chipmunk space?
It sounds like a simple sign issue. I assume the balls are moved by applying a force to them. So instead of applying a positive force like (10, 0) apply a negative force (-10, 0) when moving the balls in one direction, and do the reverse in the other (eg multiply x coordinate forces by -1). Chipmunk doesn't care or know about device orientation, it just moves objects according to forces and gravity.