Post-processing effects Morten Paluteder Post-processing effect? - - PowerPoint PPT Presentation

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Post-processing effects Morten Paluteder Post-processing effect? - - PowerPoint PPT Presentation

Jan 23, 2024 2.47k likes •2.77k views

Post-processing effects Morten Paluteder Post-processing effect? Render the scene as normal Don't project to the screen, save Apply shaders Project the outcome https://www.youtube.com/watch?v=3Asqn9SNTnk Color grading Tone

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SLIDE 1

Post-processing effects

Morten Paluteder

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SLIDE 2

Post-processing effect?

  • Render the scene as normal
  • Don't project to the screen, save
  • Apply shaders
  • Project the outcome
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SLIDE 3
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SLIDE 4
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SLIDE 5
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SLIDE 6

https://www.youtube.com/watch?v=3Asqn9SNTnk

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SLIDE 7

Color grading

  • Tone mapping - HDR (High Dynamic Range) to

LDR(Low Dynamic Range)

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SLIDE 8
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SLIDE 9

Color grading

  • Color correction
  • 3D Lookup Table (16x16x16)
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SLIDE 10
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SLIDE 11

Antialiasing

  • Blur the edges/contrasts
  • MLAA, FXAA and SMAA
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SLIDE 12

C:\Users\tyger\Desktop\SMAA-Enhanced-Subpixel-Morphological-Antialiasing.mp4

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SLIDE 13

Eye adaption

  • Low percent, high percent
  • Min brightness, max brightness
  • Speed up, speed down
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SLIDE 14

Eye adaption

Example: Low percent – 80%, High percent – 95%

  • 80% of the screen pixels are darker than

luminance value A.

  • 95% of the screen pixels are darker than

luminance value B.

  • Average of A and B is C, current luminance

https://www.youtube.com/watch?v=5L4HTUS1RYE

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SLIDE 15

Bloom

  • Natural effect: dark objects near bright lights
  • Can't display directly: no HDR support
  • Uses gaussian blur
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SLIDE 16

Bloom

  • Threshold – required luminance for bloom
  • Bloom dirt mask – brighten up bloom in some

areas

https://www.youtube.com/watch?v=e6GM6R2zhBY

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SLIDE 17

Motion blur

  • Camera: shutter is open to give light
  • Real world: eye sensor reaction time
  • Mostly visible on 20-30 FPS/screenshots
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SLIDE 18

Motion blur

  • Camera motion blur:

2D VV: previous view matrix, current view matrix, pixel depth

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SLIDE 19

Motion blur

  • Object motion blur:

Render geometry of all motion blurred targets

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SLIDE 20

Motion blur

  • Blend camera/object motion blur together
  • Approximations
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SLIDE 21

Motion Blur Softedge

  • From which neighborhood pixels the current

pixel receives content?

  • Softedge uses gaussian blur on the velocity

texture

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SLIDE 22

Depth of field

  • Applies blur to scene based on a central point

(focal region)

  • Three layers: near, far, focal
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SLIDE 23
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SLIDE 24

Lens flare

  • Caused by imperfections of a camera lens
  • Originates from a light source
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SLIDE 25

Unreal engine 4 post-processing effects

https://www.youtube.com/watch?v=zzRsPFzu_DY

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SLIDE 26

ENB

http://enbdev.com/description_en.htm https://www.youtube.com/watch?v=_OFHllW_nDA https://www.youtube.com/watch?v=tjZ1pII5188&feature=player_detailpage#t=42