The best part is that if anyone moves your projector, you can simply repeat the calibration and match the scene with no need to alter the content. Go crazy using realtime or rendered video output for sweet open source mapping. Gear A video projector An entry-level model will be sufficient for a first project. Model the surfaces you want to have mapping content, and create your motion graphics content. Mapping Cubes in QLab Let’s look a simple mapping example. Set your placeholder image as a background image and. With MadMapper, you can define a single video surface whose output is copied to three different regions. Once you import the fSpy file you should have a new calibrated camera in the scene looking at the center of the scene (which should correspond to the center point as you placed in fSpy). You have to install the plugin for your version of Blender. Keep in mind the number of vanishing points you have, different options will give you different results. Open the image and use fSpy to calibrate focal length, camera position, center point. Keep in mind that you need to define 2 or 3 sets of vanishing points (lines that are parallel in reality but that would eventually converge when projected to 2D perspective. While watching the real, scene that should now have the placeholder image projected on it, trace as many straight lines as you can.
Now you must draw lines that will help you understand the scene when you import the image into fSpy. No encoding/ decoding is required so there is no latency, compression or computational overhead. Spout allows programs to share the same video texture from your GPU. The idea is to place yourself inside the projector so you can obtain an image of what the projector "sees". This plugin lets you send and receive video feeds to and from OBS Studio with zero latency, compression and computational overhead using Spout. Enter full screen with the following commands alt+F9 and alt+F11. Drag that window into the second display (the projector). While still in the UV/Image Editor go to View -> Duplicate Area into New Window. Go to Blender-> UV/Image Editor, create a new image matching the projector and render size, enter paint mode, set radius to 1 and paint stroke to line (choose high contrast background/line), and draw diagonals precisely to mark center and corners.
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