< Previous | Contents | Manuals Home | Boris FX | Next >
Maximizing Lens Model Compatibility and Performance
SynthEyes’s anamorphic lens models are supersets of the 4 th and 6th order anamorphic lens models currently in Fusion, Nuke, and 3D Equalizer. Those applications only have HSCL, VSCL, and ROT in the 4 th order model, not in the 6th order model. In SynthEyes, you can solve for full 6 th order distortion coefficients, and HSCL, VSCL, and ROT as well.
When SynthEyes distortion is exported to Fusion or Nuke, the exporter may need to generate multiple compositing nodes to achieve the full distortion computed by SynthEyes. That is great for achieving a good match but has two potential side effects: possible repeated resampling of the images, and increased rendering times.
The Fusion and Nuke exporters examine the distortion being exported, and for no-pass workflows can generate simpler compositing pipes using the downstream anamorphic 4 th lens model when the situation permits. This section will describe situations permitting simpler pipes.
Simplest Anamorphic 6th. Keep ROT at zero, HSCL and VSCL at 1.0, and the anamorphic squeeze ratio at 1.0 . All distortion coefficients can be used. While the anamorphic squeeze is technically some larger value, mathematically it does not matter in this situation, and keeping it at 1.0 is best. For the simplest pipe, the shot pixel aspect ratio should be 1.0.
Simplest Anamorphic 4th. Keep ROT at zero (or less usefully the squeeze ratio at 1.0). Don’t use any of the sixth order coefficients (C06=C26=C46= C66=0). HSCL and VSCL can be used, ie for focus breathing shots. (Nuke and Fusion don’t handle rotation with squeeze correctly.)
Keep in mind that these are the configurations that produce the simplest render pipes; the Fusion and Nuke exporters will generate multiple nodes as needed to generate the computed distortion.
For 3D Equalizer, it’s not possible to generate additional compositing nodes, so the models must be matched exactly: either the 6 th order model with ROT=0, HSCL=VSCL=1, and anamorphic squeeze=1; or the 4 th order model with the 6th order coefficients equal to zero. For 3D Equalizer’s 4 th order model, you can use ROT, HSCL, VSCL, and anamorphic squeeze all without problem.
©2023 Boris FX, Inc. — UNOFFICIAL — Converted from original PDF.