subtle anamorphic lens effects - silicon studio€¦ · subtle anamorphic lens effects real-time...
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Subtle Anamorphic Lens EffectsReal-time Rendering of Physically Based Optical Effect in Theory and PracticeSIGGRAPH 2015 Course
Masaki KawaseSilicon Studio, Corp.
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Anamorphic Lens
• To implement wide vision using the standard film format
– Project wide image onto the sensor with horizontal compression
– When screening, the image is stretched horizontally
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Original scene Compressed image Screen
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Anamorphic Lens Effects
• Well-known effects– Horizontal lens flare and ghosts (streaks)– Oval aperture bokeh
• Less-known effects– Horizontally stretched lens flare– Horizontally stretched film grain– Anamorphic astigmatism– CA of horizontal magnification– Cylindrical lens distortion– Vignetting by oval aperture– And more …
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Panasonic LA7200 Anamorphic Lens Flare by Andrei Jikh
http://vimeo.com/9493224#at=0
Anamorphic Lens Shots - Before & After
http://vimeo.com/16350276
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Importance of Less-known Effects
• Helpful to create distinctive atmosphere
– Each effect on its own is subtle
– But together, they will affect the overall atmosphere
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Standard Lens Simulation
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Anamorphic Lens Simulation (with Well-known Effects)
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Anamorphic Lens Simulation (Adding Less-known Effects)*Exaggerated for presentation purposes
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Horizontally StretchedLens Flare and Film Grain
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Horizontally Stretched Flare and Film Grain
• The effects are stretched by anamorphic projector lens
• Implementation
– Shrink working buffer width for the flare
• Render flare normally
• The results become stretched automatically
– Scale the noise texcoord horizontally for the grain
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Standard Lens Flare
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11Entire lens flare and film grain is stretched horizontally
Anamorphic Lens Flare
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Film Grain is also Stretched
Exaggerated for presentation
Standard lens Anamorphic lens
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Anamorphic Astigmatism
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Because of Cylindrical Lenses
• Anamorphic lens systems include cylindrical lenses• Astigmatism for anamorphic lens can be caused
– Similar to corneal astigmatism
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Including cylindrical lenses
Anamorphic lens system
Horizontal Focus P1
Vertical Focus P2
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Horizontal blur at P2
Including cylindrical lenses
Anamorphic lens system
Horizontal Focus P1
Vertical Focus P2
Linear Blur by Astigmatism
• Horizontal or vertical focus generates linear blur• Never focus perfectly
– Circle of least confusionCompromised Focus P3
Vertical blur at P1
Circle of Least Confusion at P3
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Vertical Focus
• Horizontal blur as back bokeh in this lens
16From real anamorphic lens
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Circle of Least Confusion Position
• Cannot focus perfectly
17From real anamorphic lens
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Horizontal Focus
• Vertical blur as front bokeh in this lens
18From real anamorphic lens
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Vertical Focus
Horizontal blur as back bokeh in this lens
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Circle of Least Confusion
Cannot focus perfectly
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Horizontal Focus
Vertical blur as front bokeh in this lens
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Implementation of Astigmatism
• Offset the horizontal and vertical focal planes in opposite directions by a little amount
• Calculate horizontal and vertical CoCs separately
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Result: Vertical Focus
• Horizontal blur as back bokeh
Implementation results 23
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Result: Circle of Least Confusion
• Cannot focus perfectly
Implementation results 24
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Result: Horizontal Focus
• Vertical blur as front bokeh
Implementation results 25
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Vertical Focus
Horizontal blur
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Circle of Least Confusion
Cannot focus perfectly
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Horizontal Focus
Vertical blur
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Aberrations by Cylindrical Lenses
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CA of Magnification
• Optical Magnification ‘M’ differs by wavelength
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CA of Magnification (cont’d)
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CA of Horizontal Magnification
• Apply CA of magnification only in horizontal direction
CA of horizontal magnificationCA of magnification32
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Anamorphic Lens
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Anamorphic Lens
CA of horizontal magnification
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Standard Lens
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Cylindrical Lens Distortion
Horizontally strong barrel distortion
Anamorphic lens
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Standard Lens Distortion
Barrel distortion
Standard lens
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Conclusion
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Conclusion
• Anamorphic lenses yield various effects
– Well-known and less-known effects
• Less-known effects should not be ignored
– Each effect on its own is subtle
– But together, they will affect the overall atmosphere
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Standard Lens
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Anamorphic Lens (with Well-known Effects)
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Anamorphic Lens Simulation (Adding Less-known Effects)*Exaggerated for presentation purposes
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References
• Kawase, M. “Camera, Optics Theory and Post Effects for Renderists.” Computer Entertainment Developers Conference, 2007.
• Kawase, M. “Practical Implementation of Cinematic Lens Effects.” Computer Entertainment Developers Conference, 2012.
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