A fulldome fisheye renderer for Cinder 0.9.0.
Big thanks to Paul Bourke whose work was critical to figuring this out, specifically this post.
How it works
Internally FullDome will create four cameras. Two that look left and right of center 45 degrees on the X-axis, and then 2 that look straight up and straight down with a 45 degree Y-axis twist.
Each draw cycle each, one is bound and then rendered to an FBO. Each FBO is then bound and mapped to a piece of geometry that makes up a piece of the final circular fisheye render. This means that for each one frame, the scene is drawn four times.
Create a normal PerspCamera to drive the fulldome camera.
CameraPersp mCam; mFullDome = FullDome::create( &mCam );
You can change the size of the four individual camera fbos in the constructor. The default is 2048 x 2048. Below we're setting it to 1024 x 1024.
mFullDome = FullDome::create( &mCam, 1024 );
During your draw render your scene once for each camera.
mFullDome->bindCamera(FullDome::DomeCam::LEFT); render(); mFullDome->unbindCamera(FullDome::DomeCam::LEFT); mFullDome->bindCamera(FullDome::DomeCam::RIGHT); render(); mFullDome->unbindCamera(FullDome::DomeCam::RIGHT); mFullDome->bindCamera(FullDome::DomeCam::UP); render(); mFullDome->unbindCamera(FullDome::DomeCam::UP); mFullDome->bindCamera(FullDome::DomeCam::DOWN); render(); mFullDome->unbindCamera(FullDome::DomeCam::DOWN);
The image can then be drawn directly, or rendered to an FBO.
mFullDome->renderToFbo(); gl::TextureRef texRef = mFullDome->getFboTexture();
As a caveat, if your lighting calculations are in camera space, they will render funny since the final image is made up of four different cameras. Check the included shaders for an example.
The MIT License (MIT)
Copyright (c) 2016 Charlie Whitney
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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