I need to have an object fixed at the bottom left corner of the camera/visible area (is a branding image, a logo). Somebody have any idea on how to accomplish this?
We strongly recommend against truly display locked elements. They will not render well, and all of our user research tells us that people strongly dislike them.
If you want to have something that stays in view, you can use the tag-along feature available in the HoloToolkit-Unity project. https://github.com/microsoft/HoloToolkit-Unity/
The docs.unity3d.com/Manual/UICanvas.htmland the Hololens support for it will allow you to place a UI canvas with and image or with another UI element to hold the image.
The important part about any of the Unity UI elements like canvas is that you can set their "Render Mode" to either Screen or World space. Screen space will lock it into the view and move with you as opposed to being in the world and you moving around it.
That said, please also consider all of the design guidance and other discussions on things like HUDs when deciding whether or not to lock something into the users visible area.
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@ChimeraScorn, is there any published research you can point to regarding display locked content and its effect on user comfort?
Having used Hololens now for a month, I completely agree with @ChimeraScorn's answer. I was in the same boat as you, but the more I used it, the more it just didn't fit with the style of holograms. The Tagalong feature is what you want to use for UI, Menu's, etc that in normal development would remain fixed on the screen.
A latest tutorial on Tag Along and Billboarding, https://codeholo.com/2018/12/24/tag-along-billboarding-and-other-menu-elements-for-hololens-apps/