I created an app that lets you place images in perspective in 3D space without actually needing 3D models and a 3D world.

This app was written in Dart using the Flutter framework for cross-platform app development, which makes it painless to build your code as static frontend code for the web or as a native app on desktop or mobile. Behind the scenes, it's doing linear algebra, based on a breakdown of perspective transformation coefficient derivation that I found. In addition to creating images, it's built to output JSON files with all the coefficients that are needed to open and use designs in this and other programs.

I created this app to help with my NYT Spelling Bee graphics project, for which I needed to position letters in 3D space to align them with elements in pre-existing image templates. I could have used the perspective warp tool in a program like PhotoShop to create this effect by hand, or with some work, I could have set up quadrilaterals in 3D space in the 3D modelling program Blender and used the built-in scripting capabilities and command line interface to prompt a slow and expensive render with image textures of letters placed where I wanted them to be, but I wanted a way to programmatically output this kind of scene that was appropriately simple and less fragile and wouldn't drive me insane. This was the result.