Im using RealityKit to place virtual objects in a room and using gestures to drag and rotate them in the physical space.
After placing a virtual object(chair) from a USDZ onto a horizontal Plane, I setup gestures something like:
modelEntity.generateCollisionShapes(recursive: true)
arView?.installGestures([.translation, .rotation], for: modelEntity)
Translation and Rotation seem to work fine, but when I drag the virtual object towards a wall, it seems to "go into" the wall instead of stopping at the wall.
Is there a way to achieve this in RealityKit? Do I need to implement my own GestureRecognizers and perform raycast on each pan gesture callback?
Related
I am a student learning how to code in Xcode using swift. I am currently trying to make an app similar to the snake game that hopefully everyone knows.
I am currently on a windows computer so I can't show my code at the moment. I doubt you will need it for what I'm asking.
I am trying to make my Sprite Node (Just a while square) move with a swipe of the screen in the up, down, left, right fashion just like the original snake game. I have the Gesture Recognizer set up so it prints out what direction your swiping.
How can I make the sprite node move with a swipe? I want it to move infinitely in that direction until you either 1.) hit a will and you respawn/game over or 2.) swipe in a different direction.
I assume you add velocity to the node when you swipe so you just add the code into that swipe snippet but how do I make it apply ONLY to the "snake"?
You can use an SKAction to move the snakeHead toward the wall that corresponds to the direction you want to move. This can be done in the action parameter when you declare your gestures.
I suggest using .move(to: duration:) and to maintain a constant speed toward each wall you can use the distance, speed, time formula to calculate the duration for the .move(to: duration:) action.
Check out https://developer.apple.com/documentation/spritekit/skaction
https://developer.apple.com/documentation/spritekit/skaction/1417768-move
I am developing horizontal plane detection application using ARKit. It seems to be working fine. Once floor is detected I am trying to place SCNPlane 2meter Hight and 2meter width horizontally from the centre point(detected floor). It is also working fine when floor is empty. If floor has some objects(obstacles like furniture) then SCNPlane is being placed over the object instead of the floor(under the object). How to detect only Horizontal floor excluding the objects. please guide me. thanks
When you are searching and have found the floor the ARKit will put out a grid, normally people use some kind of grid image to display this, but some don't want to show it. Once the grid has placed you place a SCNPlane, which i assume has an physical body as you say it falls towards the floor / furniture?
You can do this in 3 ways:
You can to stop the worldTrackingConfiguration once the floor has
been found.
You can once the floor has been found, fetch that Y-position and bind every object to fall towards that Y-position.
I guess you could check if the Y-position of the new detection overlaps with the floor detection, then it's fine else it's not. (I have not tested this one)
I am making a Sprite Kit game where the player (basically a stickman) has a running animation and a parallax scrolling background.
Now I have enemies that come near my player. To destroy these enemies sometimes I have to touch the enemies node to launch a rocket or attack them with an attack button or just jump over them.
Everything is working fine, but I want to add some extra moves to destroy them. I want some enemies that you can just destroy if you have drawn a whole circle around them. So imagine they come and you make a circle and then my player launch a laser or something. The problem is I have no idea where to start.
I haven't found anything on the internet. If it's too complicated or almost impossible how about touching my player node and dragging to the enemy?
EDIT: I think I have to create a custom GestureRecognizer that recognizes if a circle is drawn around a sprite and then runs the code. I don't know how this works ?
Yes, it's too complex. Not just from a coding point of view, but also from that of the player's experience.
Anything that requires complex gestures over a large amount of glass is annoying for the player because they're never going to have the same experience. Their finger's moisture and oil content always changes, as does the ambient temperature and cleanliness of their screen.
So big gestures required to be performed quickly (a gaming input like this) will sometimes be fun and smooth, and other times degrade as an experience based on the nature of the above properties.
Best to avoid them for a game's best possible experience.
If you must do it, there's two ways to research how.
Seek out "custom gesture" creation and utilisation through documentation and google, etc.
Think about using some kind of array to store all the points where the player's finger moves through during that circle gesture and attempt to discern if an enemy is within that space and then act accordingly.
--- probably other ways, too. But these jump to mind.
If I have a sprite node, just a white circle somewhere on the screen, how am I able to make it so when I drag, let's say downwards and slightly to the left, the circle sprite would launch upwards and to the right and then gradually come down, like a golf shot.
Another way of explaining the mechanic is the Angry Birds game, where you launch the birds of the slingshot, the birds move in the opposite direction of your drag and gradually come down.
For another live example of the mechanics of the circle, look at the app, Desert Golfing.
Thanks, and if you don't know what I mean just comment and I'll try to explain it better.
OPTIONAL: If you do know how to do the slingshot type mechanic for the circle, do you also know how to add an arrow to the screen so users know which way the circle will launch?
Ill try to break your problem down into small steps that you could then solve yourself:
Detect the swipe:
use a UIPanGestureRecognizer. You will be able to implement a method that is called whenever a user drags their finger in a certain direction.
Here are some good references:
- Pan Gesture Official Documentation
- A very useful question that can serve you as a guide
Detect the magnitude of the swipe in order to impart an impulse
Check out the second link above. What you have to do is in the method for the gesture recognizer you will detect certain flags such as when the user starts the pan or ends the pan. Then, you can check for the location at those moments. With the Pythagorean theorem you should be able to get the distance and use that as the magnitude.
Apply impulse:
Create a physics body for your sprite and then make sure that you have gravity set inside your physics world. This allows the sprite to move in a parabolic motion. Then, use applyImpulse: on your physics body with your magnitude.
Regarding the arrow, you can easily do some delegation from within your pan gesture handler that gets the magnitude of the swipe and projects a reflection that your arrow will then show. Your question is pretty loaded so going into more detail is impossible, but best of luck. Hope this helps!
I have a SpriteKit Scene in which I want to have the effect as if a camera zoom and scale. Does anyone know of any libraries or some easy methods of doing this?
It was very easy to do in other 2D engines but does not seem simple.
I was thinking of doing it from the app delegate, and using the window to zoom since my character does stay around the same position.
The desired effect I would like to accomplish is like that of the start of an Angry Bird level when the camera pans into the level and then the launch doc.
http://www.youtube.com/watch?v=_iQbZ3KNGWQ This is an example of the camera zoom and pans I am talking about.
Thanks for the help.
If you add an SKNode to the SKScene, and make your scene content children of that node instead of direct children of the scene, then you can zoom and pan all of the contained content just by adjusting the xScale, yScale and position properties of the added node. (Any content you did not want scrolled e.g. scores or whatever could then be added to a different SKNode or added directly to the scene).
The adjustment could be done by overriding one of update:, didEvaluateActions, or didSimulatePhysics in your SKScene subclass. The choice would depend on if you are just moving your character around by yourself in update:, or if it also gets moved around by running SKActions or by simulated physics.