This patch add a new omnidirectional camera model in Blender, allowing it to render images according to the omnidirectional camera model

Building

Follow the instructions on the Blender Wiki to compile Blender.

2022-11-04: Adapt to the latest blender source code. Simply type

git apply 0001-Add-omnidirectional-camera-model-to-Cycles-rendering.patch

to apply this patch

Using the Omnidirectional camera model

• Make sure you're using the Cycles render engine
• Select your camera, and go to the camera panel
• Switch the Lens type to "Panoramic" and select the "Omnidirectional" lens subtype
• Render your image normally (both CPU and GPU rendering are supported)

Omnidirectional camera parameters

• Polynomial: a0, a1, a2, a3, a4, a5 correspond to the polynomial backward projection function parameters (in increasing degree order)
• Shift: projection center shift from the image center, in pixels
• Affine: correspond to the affine parameters in the omnidirectional camera model
• Radius: scale factor used to compute the radius of the crop circle (radius = scale * image_height / 2.0). If zero, no crop circle is added.

How to get these parameters?

The easiest is to get them from a real fisheye or catadioptric camera. Calibrate your camera using the Ocamcalib toolbox. The toolbox will output the necessary parameters.

Warning: one set of parameters is valid for a given image size.

Known issues

• Using motion blur using the omnidirectional camera leads to incorrect results

License

This code is released under the Creative Commons license (CC BY-NC-SA 3.0), which is free for non-commercial use (including research).