i need to hide objects behind other invisible objects in Hololens 2.
Indeed, I must display virtual cars that can move behind a building.
The buildings are mehes (FBX) superimposed on reality, but which are not displayed. They only serve as a mask.
(I can’t use spatial mapping because the buildings must be those coming from an FBX).
I do not find tutorials or documentation for that. Is there specific function in Hololens to do that ?
Regards,
Related
I'm making an augmented reality app with Unity and Mapbox for both ios and android. I have data sets that I am using to make markers in the real world when someone uses the app. I collected json files and converted them to geojson files and then I made a custom map in Mapbox Studio with these 4 different geojson files. Basically I want to have the markers from the datasets I collected to show up in the real world. I am not sure how to get these markers to show up in the real world and not with building prefabs. Example of my custom app made in Mapbox. Each color shows a different category of markers. There are four categories.
Here is an example of what I am referring to.
In this image skeletons can show up in the real world.
Here is an example of what I am not referring to.
In this image droids are place in a map but it is not the real world. It is like Pokemon Go where the map is generated with location but you don't actually see the real world when you are playing.
I already have my Unity project set up and this is the final step, but I am just having issues getting it to show up in the real world. So far, tutorials only show on to get it to reflect something like Pokemon Go.
You will have one scene with a stationary Camera. Your code will monitor the MapBox data in Update(), constantly passing the current GPS position and receiving your list of markers/points of interest. You can simply randomly spawn skeletons in a sphere area (see https://docs.unity3d.com/ScriptReference/Random-insideUnitSphere.html) around the Camera's transform position once you detect that the user's GPS position is in within a certain distance of the center of your point of interest. Keep track of that list, and destroy the skeletons once they leave the area - and have some way of making sure you only spawn them once for that area.
Your skeletons should have a NavMeshAgent, and you should generate a NavMesh onto the ARFoundation plane for them to walk on. In this case, the plane is probably dynamically created and you may need to use the dynamic NavMesh component https://github.com/Unity-Technologies/NavMeshComponents. If you tell the NavMeshAgent to go to a specific point it will walk to the closest point - so even though you get a random position in the sphere in 3D, the skeleton will move or spawn onto the nearest point so there is no need to figure out how to convert it to the 2D plane space.
Your AR view, both the tracking of the camera position/angle and the generation of a plane representing the ground, will be something generated by ARFoundation and it is simple to add the basic functionality. They have a prefab that already includes the camera and generates the plane for you. You can get ARFoundation via the Unity Package Manager. It will work with many different types of devices.
You should start with a cheap Android phone or tablet, even if you own an iPhone, because it's easier to load the APK and debug/develop your app via Android build.
This is a simplification. I recommend using Singletons, ScriptableObjects, Object Pooling, and other Unity paradigms and plenty of other things within Unity that would help you but as another user pointed out - you may want to spend time learning Unity, ARFoundation, MapBox, and ask more specific programming questions when you are ready.
I'm trying to build a Remote Assistance solution using the Hololens 2 for university, i already set up the MRTK WebRTC example with Unity. Now i want to add the functionality of the desktop counterpart being able to add annotations in the field of view of the Hololens to support the remote guidance, but i have no idea how to achieve that. I was considering the Azure Spatial Anchors, but i haven't found a good example of adding 3D elements in the remote field of view of the Hololens from a 2D desktop environment. Also i'm not sure if the Spatial Anchors is the right framework, as they are mostly for persistent markers in the AR environment, and i'm rather looking for a temporary visual indicator.
Did anyone already work on such a solution and can give me a few frameworks/hints where to start?
To find the actual world location of a point from a 2D image, you can refer this answer: https://stackoverflow.com/a/63225342/11502506
In short, cameraToWorldMatrix and projectionMatrix transforms define for each pixel a ray in 3D space representing the path taken by the photons that produced the pixel. But anything along a certain ray will show up on the same pixel. So to find the actual world location of a point, you'll need either use Physics.Raycast method to calculate the impact point in world space where the ray hit the SpatialMapping.
I am working on a Projection Mapping Project and I am prototyping in Unity 3D. I have a cube like object with a 3D terrain and characters in it.
To recreate the 3D perspective and feel I am using two projectors which will project in a real world object which is exactly like the Unity Object. In order to do this I need to extract 2D views from the shape in Unity.
Is there an easy way to achieve this ?
Interesting project. It sounds like you would need multiple displays, one for each projector, each using a separate virtual camera in Unity, like documented there.
Not sure if I understood your concept correctly from the description above. If the spectator should be able to walk around the cube, onto which the rendered virtual scene should be projected, it would also be necessary to track a spectator's head/eyes to realize a convincing 3D effect. The virtual scene would need to be rendered from the matching point of view in virtual space (works for only one spectator). Otherwise the perspective would only be "right" from one single point in real space.
The effect would also only be convincing with stereo view, either by using shutter glasses or something similar. Shadows are another problem, when projecting onto the cube from outside the scene. By using only two projectors, you would also need to correct the perspective distortion, when projecting onto multiple sides of cube at the same time.
As an inspiration: There's also this fantastic experiment by Johnny Chung Lee demonstrating a head tracking technique using the Wii Remote, that might be useful in a projection mapping project like yours.
(In order to really solve this problem, it might be best to use AR glasses instead of conventional projectors, which have the projector built in, and use special projection surfaces that allow for multiple spectators at the same time (like CastAR). But I have no idea, if these devices are already on the market... - However, I see the appeal of a simple projection mapping without using special equipment. In that case it might be possible to get away from a realistic 3D scene, and use more experimental/abstract graphics, projected onto the cube...)
I've developed 2d rpg top down game and I faced with next problem:
What's the best way to place building (houses, blocks of flats, etc) on tile map?
Currently I found only two ways:
1. Use plenty of scenes or master scene for buildings (and configure switch bettween levels
2. Create places outside the camera and teleport players there.
I wouldn't like to use this methods. I'd like to place objects on the tile map and have got the opportinity enter there without swich scene or teleportation.
Could you give me any ideas?
Currently, I know that Vuforia can track objects that are scanned in the targets database. This means that if I wanted to recognize many objects, I have to scan each of them and upload them into the database.
Here’s what I want to create. I want to create an app using Unity that can recognize and track simple shapes (such as a rectangular box or a spherical ball) disregarding the size. For example, the app should be able to recognize a small Kleenex box as well as a big shipping box.
Is it possible to recognize these shapes with minimal object targets (e.g. recognize all rectangular objects with one object target)? If so, how can I set up vuforia to do so? I understand that this question may be confusing to understand, and I will do my best to elaborate more clearly. Thanks so much!