The effect of stretching up and down the image is attenuated compared to the spherical projection. The vertical angle is limited, it is imperative that it is less than 160 ° but the stretching begins to slightly deform at the top and bottom of the image when it exceeds 45 degrees above or below the skyline.Ĭan be used up to 360° (horizontally). The lines parallel to the horizon (curbs, tops of buildings) are still more or less curved. Verical lines are not affected with this setting. Bottom squeeze: Allows to squeeze the area lower to the horizontal axis of the vanishing point, to straighten horizontal curves of the bottom part of the image. Top squeeze: Allows to squeeze the area upper to the horizontal axis of the vanishing point, to straighten horizontal curves of the top part of the image.Distance: Lets squeeze the horizontal space of the panorama, to avoid distortions due to the horizontal FOV.Squeeze values can reduce or avoid this curving, at the expense of radial lines which would be more or less folded. Makes curved the straight horizontal lines. This can give a strong sense of perspective on views whose horizontal field of view is wide and has a single and central vanishing point. Keep vertical lines vertically and straigt radial lines. The Pannini projection is also called "Recti-Perspective", "Panini" or "Vedutismo". Horizontal squeeze: Allows to squeeze the horizontal field of view to improve distortions on the borders of the panorama.Good choice if the angle is low, recommended for architectural shots because it is the only mode that does not curve lines that are deemed to be straight lines.Ĭan be used only if the view angle is less than 180 degrees along the diagonal of the image, practice shows that beyond 90 degrees the stretching of the image is already visible along the edges and in the corners.īeyond 120 degrees, the result is no longer acceptable, because the stretching of the image causes an unpleasant loss of sharpness. Planar or rectilinear projection Advantages: When the vertical viewing angle is large, the stretching effect at the top of the image (near the zenith) and at the bottom of the image (near the nadir) varies from unusual to very unusual. PROJECTIONS Spherical or equirectangular projection Advantages:Īuthorizes the assembly of all panoramas.įor the direct display (without a viewer) of a panorama on the screen and for feel we need to ensure that the curvature of parallel straight lines on the horizon is still acceptable (there is no rule, you need to be the judge). Indeed, if some projections are available to recreate real situations to reach specifical applications (planar or spherical projections), other projections are generally for aesthetic purposes only. Many projections are available here, allowing to adjust the global panorama's geometry as well as possible, or even to realize more graphical or abstract images. This tool lets modify the projection of the current panorama. 2.1 Spherical or equirectangular projection.
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