Importing Photogrammetry into Unity
drag/drop the folder containing the OBJ/FBX into Unity (takes a while)
select the obj (in project folder, not in scene), and in the inspector, select "Extract Materials”
Drag into Scene, rotate x by -90, select the materials, and in the inspector, change their shaders to Unlit > Texture
select the textures, and in the inspector, change their import resolution from 2k to 8k (could take some time)
And there you have it!
Importing Photogrammetry into Tilt Brush
drag folder into C:\Users\<USERNAME>\Documents\Tilt Brush\Media Library\Models
Launch Tilt Brush, go to More Options > Labs > Media Library > choose model
Choose lighting, and turn down the Main and Secondary Lights to 0 (so the mesh is unlit), and turn up the Fill light to full white. If you’d like to play with the color of the mesh, do so by playing with the Fill Light color.