I'm trying to rotate a beam/cuboid around a pivot using MRTK, Unity, and the Hololens 1 when you're doing the pinch and hold gesture. The beam should remain in place once you've let go of the pinch.
My initial thoughts were to get the cartesian coordinates of the pinch and based on their position relative to the pivot, have the beam rotate by however many degrees needed. E.g. the hand position while pinching is (1,1,0), and the pivot position is (0,0,0). Thus, the beam should be rotated at 45 deg in the XY plane (we ignore the z components). I'm not sure how to go about doing this as the documentation seems to indicate that the only way to get the coordinates of the hand/pinch only works for the Hololens 2. (https://microsoft.github.io/MixedRealityToolkit-Unity/Documentation/Input/HandTracking.html#hand-tracking-events & https://microsoft.github.io/MixedRealityToolkit-Unity/api/Microsoft.MixedReality.Toolkit.Input.IMixedRealityHand.html#Microsoft_MixedReality_Toolkit_Input_IMixedRealityHand_TryGetJoint_).
Does anyone know how to go about doing this or at least point me in the right direction (tutorials/code/assets would be much appreciated!)
Thank you!
I'm not sure how to go about doing this as the documentation seems to indicate that the only way to get the coordinates of the hand/pinch only works for the Hololens 2
Yes, HoloLens1 does not support hand tracking, such as touching holograms directly with your hands or pointing and committing with hands. It is recommended that you try to use the interaction model Gaze and commit, so that you can easily get the position of GGVPointer.
Pinch to rotate interaction can be achieved by adding the ManipulationHandler component from MRTK to your cube. The component can be configured to allow two hand manipulation like this.
I'm not sure how to go about doing this as the documentation seems to indicate that the only way to get the coordinates of the hand/pinch only works for the Hololens 2.
There are a few ways to query pointer position. The code below should return the Right GGVPointer position for the hololens.
Vector3 pos;
GGVPointer pointer = PointerUtils.GetPointer<GGVPointer>(Handedness.Right);
if(pointer != null)
{
pos = pointer.Position;
}
In case you just want to rotate the Object around its center,you can use the Boundingbox Component. It creates handles that can be pinched and moved to rotate an object. you can disable the axis you don't want. It works even on the HoloLens 1.
Related
It's a 360 Video application on Unity 3D.
I want to place several objects around the camera (which has a fixed position), but I need this objects to have the same distance (same radius) from the Camera (which is the center). How can I do this? Either on Editor or by code.
I have been manually displacing objects around the camera, by dragging them by arrow tool. But it's as inaccurate as a pain to do. :)
Any light on this would help me a lot! Not only me, but anyone working with 360 videos in Unity.
Thank you all in advance!
To solve your problem, an easy solution would be to add a child "child_of_camera" to your camera and then add a child "child_of_child" to the "child_of_camera".
Now that you've done this, move the "child_of_child" away to however far from the camera you'd like it to be. After this, apply the random rotation you'd like to "child_of_camera".
Duplicate "child_of_camera" to however many objects you'd like on screen and then rotate them all to your preference.
Now, when you're moving around the camera, these children will follow along with the camera.
If you're looking so that the rotation of the camera doesn't affect the objects there are two ways you can handle this:
Place camera and "child_of_camera" (this name would now be misleading and should be renamed) under an empty GameObject and move "empty_GO" on the X,Y,Z axis instead of the camera.
or
Create a quick script to attach onto "child_of_camera" so that it always sets the "child_of_camera"s world space rotation to Vector3.zero.
As I stated in the comments, this solution is most likely not the optimal way to fix your problem but it is definitely a very simple solution that is easy to understand and implement. I hope it helps.
In c# winforms, I am drawing a figure onto the form. and you can move the figure around in a 2d game-like fashion. Left and right will turn the figure in a direction (Changes it's heading), and the up and down keys will move the figure forwards or backwards (change it's velocity). However, lets say the figure is pointed at 135 degrees. How would I know to move the x,y coordinates accordingly.
in the image below the figure is at coordinates (140, 140) with a heading of 135. To move forward, how would I calculate the new position.
Here is the big picture of what I am trying to create
y=mx+c will help you to decide y position according to x's coordinate .
take a look at this image
x1,y1 is 140,140 in your case.
y=mx+c
c=0 because 140,140
y=x tan(45°)
y=x hence tan(45°)=1
y=x
so in c#
void move object1(){
int speed=2;
x+=speed;
y+=speed;
}//but this is really easy because 135 degree and start point is 140,140 but when those are not equal this will bit different
I've searched the board, as well as the oculus board, and unity board. Couldn't really find something that helped.
I'm working on a vehicle simulation. Before we started using the oculus, it was just a regular first person perspective. You used a racing wheel/pedals to drive and the mouse to control all the buttons and switches etc. We use raycasting from the mouse point on the screen into the world to interact with the various controls in the vehicle.
Now that we're using the oculus, the raycast isn't taking into account the distortion matrix used on the oculus cameras. So you're not actually casting a ray at what you're visually clicking on. Using Debug.DrawRay I found that it was slightly off. Just to be sure, I disabled the lens correction via inspector on the OVRCameraController and sure enough the raycasting was working again.
The ray itself is calculated the usual way one does when firing from the mouse point:
ScreenPointToRay(Input.mousePosition);
Would anyone have any idea how I can adjust my ray so it works with lens correction on?
Cheers,
Gordon
Simply multiply the Distortion-Matrix with the Ray's Vectors (Position and Normal) and you have your new Ray. I would suggest using Homogeneous Coordinates with 4x4 Matrix and Vec4's where Positions has component w = 1.0 and Normals have w = 0.0; This way you can simply multiply and you are done - depending on lookup direction you might have to use the inverse matrix :)
Alright, what I ended up doing was creating a 3D cursor, bypassing the distortion matrix entirely.
I placed a gameobject at the same place as the "head" (between left eye and right eye cameras). It has a script on it that rotates up/down/left/right based on mouse movement. I then temporarily put a spot light with a narrow cone and high intensity on it so it looked like a laser pointer. I figured if the light is hitting things, so should a raycast of the same origin. Which ended up working.
However this didn't really solve the issue of using a cursor. I tried a number of things that ultimately didn't work (didn't line up with with where the light/raycast hit).
Finally I realized I was overlooking something very simple. I lowered the near clipping plane of the cameras and placed a plane as close as I could to the camera while still being visible. I then rotated it on local y by 180 so it would be invisible to the cameras and not block ray casts.
I then added some code so that when a raycast hit something, it would fire a second raycast from the hit point back to the origin. On the way it would have to hit the plane, which was essentially at the near clipping plane. I would then move my 3D cursor to that hit point.
Now it works as intended. Where the cursor is, is where the original raycast hit. The cursor now matched the position of the laser dot. So then I removed the light component. Done.
Hope this helps someone else someday.
Im not intrested in the code for this problem i just want to be pointed in the right direction.
Im using C# XNA if that helps.
Basicaly for my game i am adding collisions for example the player can't walk or fall through stones.. I have the rectangle and i know i use the .intersects comand but would i need to check collision depending on the side of the rectangle here?
I know if the player is falling i can make if playerRectangle intersects stoneRectangle playerY = stopFalling..
But if the rectangle is coliding on the side of the player.. That would be different wouldn't it ?
One simple way of dealing with this is to work out the main axis of penetration, i.e. is the player further into the rectangle horizontally, or vertically. Then, using this information, you'd move the player so they were just touching the rectangle.
i.e. Player bumps into a wall on his right.
Main axis is Horizontal, and he's to the left of the centre of the rectangle, so we know to move him left.
Searching on gamedev.stackexchange.com will give you lots of different collision detection/response options.
If your game is 2D I would recommend using something like FarSeer Physics rather than implementing yourself.
If you are interested in the algorithms it is open source and you can poke around the code to see how they implemented collision detection.
what is the best way to position the Camera in a way that i can see what i paint in a certain region?
p.e. I'm painting a rectangle at around 300,400,2200. Where do i have to place the camera and which view do i have to set so that everything fits "in"?
Is there a trick or a special method or do i have to try it out with different camera positions?
There is no standard function that will position the camera this way because there are many options (think of different sides and rotations)
A trick you could use is:
Take the center of the MeshGeometry3D by using the Bounds property and add the normal vector several times to position the Camera.
Then use the normal vector of the plane, invert it and use it as the LookDirection for the camera.
How far you need to move the camera depends on the view angle of the camera. It can be calculated. Let me know if you want to know how (it will take me a little extra time)
More information can be found here too