Refraction & BSDFs CS295, Spring 2017 Shuang Zhao Computer - PowerPoint PPT Presentation

Sep 17, 2022 •220 likes •398 views

Refraction & BSDFs CS295, Spring 2017 Shuang Zhao Computer Science Department University of California, Irvine CS295, Spring 2017 Shuang Zhao 1 Last Lecture Bidirectional path tracing II CS295, Spring 2017 Shuang Zhao 2 Todays

Refraction & BSDFs CS295, Spring 2017 Shuang Zhao Computer Science Department University of California, Irvine CS295, Spring 2017 Shuang Zhao 1
Last Lecture • Bidirectional path tracing II CS295, Spring 2017 Shuang Zhao 2
Today’s Lecture • Refraction & BSDFs • How light interacts with refractive interfaces (e.g., glass) CS295, Spring 2017 Shuang Zhao 3
Recap: Rendering Equation = + = + CS295, Spring 2017 Shuang Zhao 4
Reflection and Transmission Reflected Radiance L r Transmitted Radiance L t B R DF B T DF CS295, Spring 2017 Shuang Zhao 5
BSDFs Bidirectional Scattering Distribution Function (B S DF) CS295, Spring 2017 Shuang Zhao 6
Rendering Equation = + = + CS295, Spring 2017 Shuang Zhao 7
Smooth Dielectric BSDF • Used to model smooth interfaces like glass and water Reflected Refracted Incident Material interface • Snell’s law: η 1 sin θ 1 = η 2 sin θ 2 CS295, Spring 2017 Shuang Zhao 8
Smooth Dielectric BSDF Fresnel term CS295, Spring 2017 Shuang Zhao 9
Radiance Scaling • When light enters a medium with a higher refractive index, the same light energy is squeezed into a smaller volume, causing the radiance along each ray to increase CS295, Spring 2017 Shuang Zhao 10
Radiance Scaling (conservation of energy) CS295, Spring 2017 Shuang Zhao 11
Smooth Dielectric BSDF Fresnel term CS295, Spring 2017 Shuang Zhao 12
Smooth Dielectric BSDF Fresnel term CS295, Spring 2017 Shuang Zhao 13
Remarks • The scaling of ( η 2 / η 1 ) 2 should only be applied for radiance L , NOT importance W since there is no “conservation of energy” for W CS295, Spring 2017 Shuang Zhao 14
Rough Dielectric BSDFs Microfacet Models for Refraction through Rough Surfaces [Walter et al. 2009] Multiple-Scattering Microfacet BSDFs with the Smith Model [Heitz et al. 2016] CS295, Spring 2017 Shuang Zhao 15
Next Lecture • Radiative transfer • The mathematical model to simulate light scattering in participating media (e.g., smoke) and translucent materials (e.g., marble and skin) • Volume path tracing • Generalizing the path tracing algorithm to handle participating media CS295, Spring 2017 Shuang Zhao 16

Download Presentation

Download Policy: The content available on the website is offered to you 'AS IS' for your personal information and use only. It cannot be commercialized, licensed, or distributed on other websites without prior consent from the author. To download a presentation, simply click this link. If you encounter any difficulties during the download process, it's possible that the publisher has removed the file from their server.

Recommend

$Refraction When a light ray moves from one medium to another, the ray bends. If the second$

Refraction When a light ray moves from one medium to another, the ray bends. If the second

Refraction When a light ray moves from one medium to another, the ray bends. If the second medium has a higher index of refraction than the first, the refracted ray is bent towards the normal relative to the incident ray. Figure 32.21a

546 views • 16 slides

$Physics 116 Lecture 17 Refraction and lenses Oct 27, 2010 R. J. Wilkes Email:$

Physics 116 Lecture 17 Refraction and lenses Oct 27, 2010 R. J. Wilkes Email:

Physics 116 Lecture 17 Refraction and lenses Oct 27, 2010 R. J. Wilkes Email: ph116@u.washington.edu Lecture Schedule (up to exam 2) Today 2 Simple case: Refraction at a plane surface Last time: Light bends at interface between

248 views • 14 slides

Importance Sampling Microfacet-Based BSDFs using the Distribution of Visible Normals Eric Heitz 1

Importance Sampling Microfacet-Based BSDFs using the Distribution of Visible Normals Eric Heitz 1 & Eugene dEon 2 1 INRIA ; CNRS ; Univ. Grenoble Alpes 2 The Jig Lab Introduction Dielectric material (e.g. water, plastic) 1 Introduction

1.24k views • 82 slides

Radiative Transfer & Volume Path Tracing CS295, Spring 2017 Shuang Zhao Computer Science

Radiative Transfer & Volume Path Tracing CS295, Spring 2017 Shuang Zhao Computer Science Department University of California, Irvine CS295, Spring 2017 Shuang Zhao 1 Last Lecture Refraction & BSDFs How light interacts with

771 views • 44 slides

$Aphakic refraction Aphakic refraction Spherical power calculation Spherical power$

Aphakic refraction Aphakic refraction Spherical power calculation Spherical power

12/3/2016 Zeiss, AMO, Clarity: consultant ORA/Alcon: NFI Consulting fees donated to ASCRS Foundation (Himalayan Cataract Project) I have the following financial interests or relationships to disclose: Abbott Medical Optics: C Allergan, Inc.:

280 views • 12 slides

$Ray Tracing Recursive rays Reflection Refraction Thanks to UDel and MIT Ray$

Ray Tracing Recursive rays Reflection Refraction Thanks to UDel and MIT Ray

Outline Ray Tracing Recursive rays Reflection Refraction Thanks to UDel and MIT Ray Tracing Reflections Model: Perceived color at point p is an additive combination of local illumination (e.g., Phong), reflection, and

258 views • 7 slides

$Perfect imaging ! with positive refraction ! Ulf Leonhardt ! University of St Andrews, UK !$

Perfect imaging ! with positive refraction ! Ulf Leonhardt ! University of St Andrews, UK !

Perfect imaging ! with positive refraction ! Ulf Leonhardt ! University of St Andrews, UK ! Transformation optics ! [Greenleaf, Lassas and Uhlmann, Math. Res. Lett. 10 , 685 (2003) electrostatics; ! Leonhardt, Science 312 , 1777 (2006) conformal

343 views • 33 slides

$Geometrical Optics I: I: refraction, , reflection, , le lenses and im image formation$

Geometrical Optics I: I: refraction, , reflection, , le lenses and im image formation

Preparatory School to the Winter College on Optics: Advanced Optical Techniques for Bio-imaging Geometrical Optics I: I: refraction, , reflection, , le lenses and im image formation Humberto Cabrera Venezuelan Institute for Scientific

309 views • 20 slides

$Multi-GPU Accelerated Refraction-Corrected Reflection Image Reconstruction for 3D Ultrasound Breast$

Multi-GPU Accelerated Refraction-Corrected Reflection Image Reconstruction for 3D Ultrasound Breast

Multi-GPU Accelerated Refraction-Corrected Reflection Image Reconstruction for 3D Ultrasound Breast Imaging Qun (Maxine) Liu Martin Cwikla Presentation Overview Background Motivation & Problem Statement Technical Design GPU

255 views • 22 slides

$Physics 116 Lecture 16 Refraction, and ray tracing for lenses Oct 25, 2011 R. J. Wilkes Email:$

Physics 116 Lecture 16 Refraction, and ray tracing for lenses Oct 25, 2011 R. J. Wilkes Email:

Physics 116 Lecture 16 Refraction, and ray tracing for lenses Oct 25, 2011 R. J. Wilkes Email: ph116@u.washington.edu Announcements Guest lecturer today: Prof. Victor Polinger Lecture Schedule (up to exam 2) Today 3 Mirror equation

230 views • 10 slides

$Welcome! Todays Agenda: Reflections Refraction Recursion Shading models$

Welcome! Todays Agenda: Reflections Refraction Recursion Shading models

INFOGR Computer Graphics Jacco Bikker - April-July 2016 - Lecture 5: Ray Tracing (3) Welcome! Todays Agenda: Reflections Refraction Recursion Shading models TODO INFOGR Lecture 5 Ray Tracing

531 views • 41 slides

$Overview Recursive Ray Tracing Shadow Feelers Snells Law for Refraction When to$

Overview Recursive Ray Tracing Shadow Feelers Snells Law for Refraction When to

Ray-tracing Overview Recursive Ray Tracing Shadow Feelers Snells Law for Refraction When to stop! Recap: Light Transport Recap: Local Illumination m M ( ) I k = I k ( n l ) k ( ) h n = I + + r a a i , j d j s j j

567 views • 8 slides

$Microfacet models for refraction through rough surfaces Bruce Walter Steve Marschner Hongsong$

Microfacet models for refraction through rough surfaces Bruce Walter Steve Marschner Hongsong

Microfacet models for refraction through rough surfaces Bruce Walter Steve Marschner Hongsong Li Ken Torrance Cornell University Program of Computer Graphics Diffuse transmission measured transmission ground glass interface n = 1.51 1 5

779 views • 77 slides

$Microfacet models for re fm ection and refraction Steve Marschner Cornell University CS 5625$

Microfacet models for re fm ection and refraction Steve Marschner Cornell University CS 5625

Microfacet models for re fm ection and refraction Steve Marschner Cornell University CS 5625 Spring 2016 (based on presentation for Walter, Marschner, Li, and Torrance EGSR 07) Microfacet scattering models Rough dielectric surface

621 views • 51 slides

$lecture 18 - ray tracing - environment mapping - refraction Recall Ray Casting (lectures 7,$

lecture 18 - ray tracing - environment mapping - refraction Recall Ray Casting (lectures 7,

lecture 18 - ray tracing - environment mapping - refraction Recall Ray Casting (lectures 7, 8) for each pixel (x,y) { cast a ray through that pixel into the scene, and find the closest surface along the ray through that pixel compute the

589 views • 47 slides

When waves interact with matter, they can be reflected, transmitted, or a combination of both.

29 Reflection and Refraction When waves interact with matter, they can be reflected, transmitted, or a combination of both. Waves that are transmitted can be refracted. 29 Reflection and Refraction Light doesnt travel through a mirror,

1.15k views • 104 slides

Wave Picture Reflection and Transmission @ dielectric interface Snells Law 1. Fermat's

Wave Picture Reflection and Transmission @ dielectric interface Snells Law 1. Fermat's principle, which states that the light travels the path which takes the least time. By taking the derivative of the optical path length, the stationary

76 views • 5 slides

lecture 18 Recall Ray Casting (lectures 7, 8) Ray tracing is like ray casting, but now mirror

lecture 18 Recall Ray Casting (lectures 7, 8) Ray tracing is like ray casting, but now mirror reflections are allowed. - ray tracing for each pixel (x,y) { - environment mapping cast a ray through that pixel into the scene, and find the

380 views • 6 slides

CMSC427 fall 2017 Global illumination intro Ray tracing and radiosity So far local

CMSC427 fall 2017 Global illumination intro Ray tracing and radiosity So far local illumination One triangle, one light at a time Object rendering into image what pixel sees me? Opaque surfaces No shadows, no crosstalk between

476 views • 31 slides

Chapter 13: Wave Propagation EET-223: RF Communication Circuits Walter Lara Electrical to

Chapter 13: Wave Propagation EET-223: RF Communication Circuits Walter Lara Electrical to Electromagnetic Conversion Since the atmosphere is not a conductor of electrons (instead a good insulator), electrical energy must be converted into

1.41k views • 26 slides

$Computer Graphics (CS 543) Lecture 9 (Part 1): Environment Mapping (Reflections and Refractions)$

Computer Graphics (CS 543) Lecture 9 (Part 1): Environment Mapping (Reflections and Refractions)

Computer Graphics (CS 543) Lecture 9 (Part 1): Environment Mapping (Reflections and Refractions) Prof Emmanuel Agu (Adapted from slides by Ed Angel) Computer Science Dept. Worcester Polytechnic Institute (WPI) Environment Mapping Used to create

510 views • 49 slides

Slide 1 / 56 Slide 2 / 56 1 When an object is placed in front of a plane mirror 2 A point

Slide 1 / 56 Slide 2 / 56 1 When an object is placed in front of a plane mirror 2 A point object is placed in front of a plane mirror. the image is: Which is the correct location of the image produced by the mirror? Upright, magnified and

390 views • 10 slides

$Formalizing Both Refraction-Based and Sequential Executions of Production Rule Programs Bruno$

Formalizing Both Refraction-Based and Sequential Executions of Production Rule Programs Bruno

Formalizing Both Refraction-Based and Sequential Executions of Production Rule Programs Bruno Berstel-Da Silva Albert-Ludwigs-Universitt Freiburg IBM France Lab RuleML Montpellier August 29, 2012 1 / 10 RuleML 2012 Formalizing the

325 views • 31 slides

Game Engines CMPM 164, F2019 Prof. Angus Forbes (instructor) angus@ucsc.edu Montana Fowler (TA)

Game Engines CMPM 164, F2019 Prof. Angus Forbes (instructor) angus@ucsc.edu Montana Fowler (TA) mocfowle@ucsc.edu Website: creativecoding.soe.ucsc.edu/courses/cmpm164 Slack: https://ucsccmpm164.slack.com Homework 2B - extended 2B: Implement

585 views • 25 slides