{"id":2451,"date":"2017-10-01T16:52:22","date_gmt":"2017-10-01T16:52:22","guid":{"rendered":"http:\/\/julius-ihle.de\/?p=2451"},"modified":"2021-05-02T14:28:28","modified_gmt":"2021-05-02T14:28:28","slug":"playing-with-osl-3-windowbox-shader","status":"publish","type":"post","link":"https:\/\/julius-ihle.de\/?p=2451","title":{"rendered":"Playing with OSL #3: WindowBox Shader"},"content":{"rendered":"

\"oslwbox\"<\/a>The latest addition on my journey to OSL is a WindowBox (sometimes also called Interior Mapping<\/a> or Parallax Mapping) shader.<\/p>\n

I remember\u00a0one of our teachers in university telling us about how they rendered all the interiors of the buildings in Spiderman with just a simple plane with a shader attached to it that simulates the room interior with proper parallax. Since then this has always stuck in my mind and I saw it being used in some studios I worked at whenever there was a big city to be rendered. I finally found the time (.. too much time :) ) to do this sort of shader myself in OSL!<\/p>\n

It’s been a really exciting but also quite tough journey for a not very math-savy person like me to do this project but I have been able to mash something together that works! This shader is useful for\u00a0giving the illusion of room interiors on just a single plane. It therefore safes you from modeling room interiors for mid-\/background-buildings. It’s solely texture based – \u00a0it takes a single input texture which should be laid out in a specific way to make sure the different sections of the room\u00a0are where they are supposed to be:<\/p>\n

\"wbox_template\"\"wbox_example\"<\/p>\n

 <\/p>\n

Apart from all the walls of the room you also have a midground layer (which could be furniture for example) and a curtains layer to give additional complexity and depth.<\/p>\n

The textures can be created in your favorite 2D program, but if you have access to Nuke and you are familiar with it I also added an example Nuke script to the package for creating and laying out your own window boxes.\u00a0With it you get a few convenience features so you won’t have to worry about making sure everything is placed in the correct spot.
\nWhen you create your own textures there are a couple of things to keep in mind:<\/p>\n