technical questions about hololens

quintendc

Hi,

i have a few questions about hololens.

• is there a limit on how many holograms/3D models you can show in 1 scene/view?
• is there a limit on how far away you can be from a hologram?
• are they planning to support unreal engine 4?
• have the hololens GPS build in?

thanks in advance,

Dwight_Goins_EE_MVP

For the first two questions check out this post:
https://forums.hololens.com/discussion/1968/30fps-performance-with-simple-meshes-in-unity#latest

[https://forums.hololens.com/discussion/1983/what-is-the-minimum-distance-that-i-can-project-a-hologram-in-the-real-world
https://forums.hololens.com/discussion/1873/more-than-1200-triangles-per-qubic-meter
](https://forums.hololens.com/discussion/1983/what-is-the-minimum-distance-that-i-can-project-a-hologram-in-the-real-world https://forums.hololens.com/discussion/1873/more-than-1200-triangles-per-qubic-meter "https://forums.hololens.com/discussion/1983/what-is-the-minimum-distance-that-i-can-project-a-hologram-in-the-real-world
https://forums.hololens.com/discussion/1873/more-than-1200-triangles-per-qubic-meter
")
The limit is based on performance. It is recommended that you keep the performance of the device operating at 60 FPS, for best user experience. You can display 100's miniature holograms, with low vertex and index counts and keep performance at 60FPS, then again you can display 1 hologram with 1000's of vertex and index counts which could potentially drop performance to under 60 FPS, it all depends.

Then there is animation as well, physics engines, spatial sound, spatial input, and spatial mapping, all this goes into your app which could affect performance. So the limitation is to keep the perf at 60FPS, not how many holograms you can display.

As far as how far you can be... Until the image looks like 1 pixel or another way of saying is it's so small it becomes difficult to see it, select it, hear it, and interact with it.

For the last questons:
HL supports UWP applications, so UE 4 and Microsoft just released an update and source for allowing UE 4 engines to compile to UWP apps. However this does not mean UE 4 can compile to Holographic applications just yet. Someone has the task of getting the UE 4 engine to tap into the Holographic framework/api's, stereo rendering, and understanding Gaze, Gesture, Voice and Spatial sound. The Source code is there, someone just has to put it all together. So I would say yes, it will in time. This post has it all

The HL does not have a GPS built in. You have 2 options currently, pair it with a Phone using Bluetooth, or pair it with a bluetooth GPS device. Check out this https://youtube.com/watch?v=4DbppcFIDMw

Dwight_Goins_EE_MVP

For the first two questions check out this post:
https://forums.hololens.com/discussion/1968/30fps-performance-with-simple-meshes-in-unity#latest

[https://forums.hololens.com/discussion/1983/what-is-the-minimum-distance-that-i-can-project-a-hologram-in-the-real-world
https://forums.hololens.com/discussion/1873/more-than-1200-triangles-per-qubic-meter
](https://forums.hololens.com/discussion/1983/what-is-the-minimum-distance-that-i-can-project-a-hologram-in-the-real-world https://forums.hololens.com/discussion/1873/more-than-1200-triangles-per-qubic-meter "https://forums.hololens.com/discussion/1983/what-is-the-minimum-distance-that-i-can-project-a-hologram-in-the-real-world
https://forums.hololens.com/discussion/1873/more-than-1200-triangles-per-qubic-meter
")
The limit is based on performance. It is recommended that you keep the performance of the device operating at 60 FPS, for best user experience. You can display 100's miniature holograms, with low vertex and index counts and keep performance at 60FPS, then again you can display 1 hologram with 1000's of vertex and index counts which could potentially drop performance to under 60 FPS, it all depends.

Then there is animation as well, physics engines, spatial sound, spatial input, and spatial mapping, all this goes into your app which could affect performance. So the limitation is to keep the perf at 60FPS, not how many holograms you can display.

As far as how far you can be... Until the image looks like 1 pixel or another way of saying is it's so small it becomes difficult to see it, select it, hear it, and interact with it.

For the last questons:
HL supports UWP applications, so UE 4 and Microsoft just released an update and source for allowing UE 4 engines to compile to UWP apps. However this does not mean UE 4 can compile to Holographic applications just yet. Someone has the task of getting the UE 4 engine to tap into the Holographic framework/api's, stereo rendering, and understanding Gaze, Gesture, Voice and Spatial sound. The Source code is there, someone just has to put it all together. So I would say yes, it will in time. This post has it all

The HL does not have a GPS built in. You have 2 options currently, pair it with a Phone using Bluetooth, or pair it with a bluetooth GPS device. Check out this https://youtube.com/watch?v=4DbppcFIDMw