How to do Camera Mapping in Blender
Why Blender Stack Exchange recommends it
Blender Stack Exchange users link it as the standard reference for camera mapping and camera projection, including when they explain how it differs from UV unwrapping or camera tracking.
Recommended by 4 people across 4 different months, 2014 to 2020.
What it is
A one-hour Blender tutorial by Andrew Price of Blender Guru, remade for Blender 2.66. It explains what camera mapping (projecting a still photograph onto simple 3D geometry from the camera's view) is and walks through doing it on a photo to get a parallax-style 3D scene.
What people said
Recommends hawkenfox · 2015-12 · Blender Stack Exchange · on “Extracting parallax data from only two photos to help reconstruct a 3D scene”
You may be interested in learning camera mapping from blender guru aka Andrew price's tutorial here on the Youtube [this video]
Recommends Jan Kadeřábek · 2016-12 · Blender Stack Exchange · on “What's the difference between camera mapping and UV unwrapping?”
Camera mapping is the most often mispresented camera matching but the actual camera mapping is well explained here: [this video]
Recommends Master Heavy · 2019-10 · Blender Stack Exchange · on “Can CGI elements emit light when in real video?”
You would camera project parts of your video to objects within the Blender scene and those objects catch the surrounding light. Than you would comp it over your footage. here is a small YT Video that shows the process with an Image but you can also use Video or Image Frames - but be aware that you have a good tracking or you will get sliding effects [LINK] ohhh and for sure BlenderGuru's Camera Mapping tutorial [this video] if you set up your scene like this, you can have your NeonSign lighten Up the surrounding Areas.
Recommends midnite vulture · 2020-02 · Blender Stack Exchange · on “Making updates to an environment that I've camera projected”
Sounds like you're on the right track! Depending on how much detail you need to fix, Blender's UV Texture Paint can save some time between Blender and Photoshop. This tutorial [this video] goes in-depth about projecting and fixing parts of an image and provides a decent workflow.
Cites MarcClintDion · 2014-09 · Blender Stack Exchange · on “Add 3D content to an image using blender”
One thing that may be true for you here. Matrices that are normally used for OpenGL camera FOV are inverted to Blender, a higher value for OpenGL has the opposite effect in Blender. For aligning your two scenes-> "Camera Mapping" seems to be the official term used in Blender circles right now. [this video] Feel free to return and also post the answer to your own question. Your math and OGL API usage looks solid, I'd be interested to see how you connect them to Blender. I use some [LINK] code to convert .obj to OGL vertex arrays.
Cites user13877 · 2016-10 · Blender Stack Exchange · on “UV unwrapping problem with image mapping”
I am doing this Blender Guru tutorial on camera mapping [this video] . In the first half hour he shows how you can map a 2D image on a cube. When doing this at about 31:00 minutes he encounters a problem. The floor and left wall are not fitting together. I have also that kind of an issue but I don't like the way he solves this. The problem is that the Project from View of this Left Wall does not fit with the image. How to solve that in the UV image editor ? [LINK] You can see that the image and the project view don't match. I don't really understand what is causing this problem and how to solve that [LINK]
Cites Jan Kadeřábek · 2016-12 · Blender Stack Exchange · on “What's the difference between camera mapping and UV unwrapping?”
It is a method which allows you to make an illusion of moving through some real scene. You match the virtual (Blender's) camera with the real footage camera, take a "screenshots" from the footage, edit them by a photo-editor and map those photos to Blender objects which help to mimic the real scenery. This way you can "reconstruct" the real scene and add custom CG objects into it. [this video] It is often misrepresented as Camera Tracking / Matching which is a different thing.