10.1371/journal.pcbi.1005894.g003 Roman Goulard Roman Goulard Jean-Louis Vercher Jean-Louis Vercher Stéphane Viollet Stéphane Viollet Setup and stereo reconstruction. Public Library of Science 2018 flow-based control modeling visual-based pitch 3 D Free fall behavior analyses anti-crash response stereo camera closed-loop control visual-based feedback control graviceptive cues speed control strategies Behavioural data pitch orientation 2018-01-23 23:06:05 Figure https://plos.figshare.com/articles/figure/Setup_and_stereo_reconstruction_/5815854 <p>(A) The setup consists of a 40x40x40cm<sup>3</sup> box illuminated from above with a halogen light. Hoverflies were filmed in the box with a fast camera through a two-way mirror at a rate of 1600 frames per second in full resolution (1280 by 800 pixels). The mirror was tilted at an angle of 45° to make the hoverfly see a uniform white wall (i.e. the reflection of the white light-diffusing ceiling). A manual switch was used to trigger the camera and simultaneously turn off the power of the electromagnet, thus releasing the resting fly and causing it to fall. A set of mirrors was used to split the images, giving two different views of the experimental box. (B) Example of a split image obtained with the set of mirror with the two trajectories superimposed. The two trajectories were used to obtained a 3-D reconstruction with the MATLAB stereo vision toolbox.</p>