The Mixed Reality Forums here are no longer being used or maintained.
There are a few other places we would like to direct you to for support, both from Microsoft and from the community.
The first way we want to connect with you is our mixed reality developer program, which you can sign up for at https://aka.ms/IWantMR.
For technical questions, please use Stack Overflow, and tag your questions using either hololens or windows-mixed-reality.
If you want to join in discussions, please do so in the HoloDevelopers Slack, which you can join by going to https://aka.ms/holodevelopers, or in our Microsoft Tech Communities forums at https://techcommunity.microsoft.com/t5/mixed-reality/ct-p/MicrosoftMixedReality.
And always feel free to hit us up on Twitter @MxdRealityDev.
Demo for embedding small objects in surfaces
I recently gave a short talk on HoloLens damage effects and, specifically, embedding small 3D objects (like 3D bullet holes) into walls. There are some quirks to doing this if spatial occlusion and mesh collision are also desired.
The code is at https://github.com/trzy/hololens/tree/master/Experiments-Unity and my talk can be found at http://trzy.org
Hope this will be useful to some folks!