Ray Tracing. Local Illumination. Object Space: Global Illumination. Image Space: Backward Ray Tracing. First idea: Forward Ray Tracing
|
|
- Toby Hamilton
- 5 years ago
- Views:
Transcription
1 CSCI 420 Computer Graphics Lecture 15 Ra Tracing Ra Casting Shadow Ras Reflection and Transmission [Angel Ch. 11] Local Illumination Object illuminations are independent No light scattering between objects No real shadows, reflection, transmission OpenGL pipeline uses this Jernej Barbic Universit of Southern California 1 2 Global Illumination Ra tracing (highlights, reflection, transmission) Radiosit (surface interreflections) Photon mapping Precomputed Radiance Transfer (PRT) Object Space: Graphics pipeline: for each object, render Efficient pipeline architecture, real-time Difficult: object interactions (shadows, reflections, etc.) Image Space: Ra tracing: for each piel, determine color Piel-level parallelism Difficult: ver intensive computation, usuall off-line 3 4 First idea: Forward Ra Tracing Shoot (man) light ras from each light source Ras bounce off the objects Simulates paths of photons Problem: man ras will miss camera and not contribute to! This algorithm is not practical Backward Ra Tracing Shoot one ra from camera through each piel in 5 6 1
2 Generating Ras Generating Ras Camera is at (0,0,0) and points in the negative -direction Must determine coordinates of corners in 3D field of view angle (fov) center of projection (COP) ra h aspect ratio = w / h w 7 frontal view 8 Generating Ras Generating Ras = tan(fov/2) a = aspect ratio = w / h COP field of view angle (fov) = 0 = 0 f = 1 = -tan(fov/2) 9 = -a tan(fov/2) = tan(fov/2) = -a tan(fov/2) = -tan(fov/2) h w = 0 = 0 frontal view = a tan(fov/2) = tan(fov/2) = a tan(fov/2) = -tan(fov/2) 10 Determining Piel Color 1. Phong model (local as before) 2. Shadow ras 3. Specular reflection 4. Specular transmission Steps (3) and (4) require recursion. Shadow Ras Determine if light reall hits surface point Cast shadow ra from surface point to each light If shadow ra hits opaque object, no contribution from that light This is essentiall improved diffuse reflection light source object 2 shadow ra (blocked) n ra camera object
3 Phong Model If shadow ra can reach to the light, appl a standard Phong model light source shadow ra (unblocked) n l ra camera v object Where is Phong model applied in this eample? Which shadow ras are blocked? Reflection Ras For specular component of illumination Compute reflection ra (recall: backward!) Call ra tracer recursivel to determine color Angle of Reflection Recall: incoming angle = outgoing angle r = 2(l n) n l Compute onl for surfaces that are reflective Reflections Eample Transmission Ras Calculate light transmitted through surfaces Eample: water, glass Compute transmission ra Call ra tracer recursivel to determine color
4 Transmitted Light Inde of refraction is speed of light, relative to speed of light in vacuum Vacuum: 1.0 (per definition) Air: (approimate to 1.0) Water: 1.33 Glass: 1.49 Compute t using Snell s law η l = inde for upper material η t = inde for lower material Translucenc Most real objects are not transparent, but blur the background Scatter light on other side of surface Use stochastic sampling (called distributed ra tracing) Transmission + Translucenc Eample The Ra Casting Algorithm Simplest case of ra tracing 1. For each piel (,), fire a ra from COP through (,) 2. For each ra & object, calculate closest intersection 3. For closest intersection point p Calculate surface normal For each light source, fire shadow ra For each unblocked shadow ra, evaluate local Phong model for that light, and add the result to piel color Critical operations Ra-surface intersections Illumination calculation Recursive Ra Tracing Also calculate specular component Reflect ra from ee on specular surface Transmit ra from ee through transparent surface Determine color of incoming ra b recursion Trace to fied depth Cut off if contribution below threshold Ra Tracing Assessment Global illumination method Image-based Pluses Relativel accurate shadows, reflections, refractions Minuses Slow (per piel parallelism, not pipeline parallelism) Aliasing Inter-object diffuse reflections require man bounces
5 Ratracing Eample I Ratracing Eample II Ratracing Eample III Ratracing Eample IV Summar Ra Casting Shadow Ras and Local Phong Model Reflection Transmission Net lecture: Geometric queries 29 5
Ray Tracing. CSCI 420 Computer Graphics Lecture 15. Ray Casting Shadow Rays Reflection and Transmission [Ch ]
CSCI 420 Computer Graphics Lecture 15 Ray Tracing Ray Casting Shadow Rays Reflection and Transmission [Ch. 13.2-13.3] Jernej Barbic University of Southern California 1 Local Illumination Object illuminations
More informationCOMP371 COMPUTER GRAPHICS
COMP371 COMPUTER GRAPHICS SESSION 15 RAY TRACING 1 Announcements Programming Assignment 3 out today - overview @ end of the class Ray Tracing 2 Lecture Overview Review of last class Ray Tracing 3 Local
More informationPhotorealism: Ray Tracing
Photorealism: Ray Tracing Reading Assignment: Chapter 13 Local vs. Global Illumination Local Illumination depends on local object and light sources only Global Illumination at a point can depend on any
More informationGlobal Illumination. Global Illumination. Direct Illumination vs. Global Illumination. Indirect Illumination. Soft Shadows.
CSCI 420 Computer Graphics Lecture 18 Global Illumination Jernej Barbic University of Southern California BRDFs Raytracing and Radiosity Subsurface Scattering Photon Mapping [Angel Ch. 11] 1 Global Illumination
More informationI have a meeting with Peter Lee and Bob Cosgrove on Wednesday to discuss the future of the cluster. Computer Graphics
Announcements Assignment 4 will be out later today Problem Set 3 is due today or tomorrow by 9am in my mail box (4 th floor NSH) How are the machines working out? I have a meeting with Peter Lee and Bob
More informationGlobal Illumination. CSCI 420 Computer Graphics Lecture 18. BRDFs Raytracing and Radiosity Subsurface Scattering Photon Mapping [Ch
CSCI 420 Computer Graphics Lecture 18 Global Illumination Jernej Barbic University of Southern California BRDFs Raytracing and Radiosity Subsurface Scattering Photon Mapping [Ch. 13.4-13.5] 1 Global Illumination
More informationGlobal Illumination. Global Illumination. Direct Illumination vs. Global Illumination. Indirect Illumination. Soft Shadows.
CSCI 480 Computer Graphics Lecture 18 Global Illumination BRDFs Raytracing and Radiosity Subsurface Scattering Photon Mapping [Ch. 13.4-13.5] March 28, 2012 Jernej Barbic University of Southern California
More informationLighting. To do. Course Outline. This Lecture. Continue to work on ray programming assignment Start thinking about final project
To do Continue to work on ray programming assignment Start thinking about final project Lighting Course Outline 3D Graphics Pipeline Modeling (Creating 3D Geometry) Mesh; modeling; sampling; Interaction
More informationRendering Part I (Basics & Ray tracing) Lecture 25 December 1, 2015
Rendering Part I (Basics & Ray tracing) Lecture 25 December 1, 2015 What is rendering? Generating an image from a 3D scene model Ingredients Representation of 3D geometry Specification for camera & lights
More informationLighting and Shading
Lighting and Shading Today: Local Illumination Solving the rendering equation is too expensive First do local illumination Then hack in reflections and shadows Local Shading: Notation light intensity in,
More informationCS5620 Intro to Computer Graphics
Ra Tracing Ra-Tracing A B C D Photorealism Objective: To generate images that are as close as possible to those perceived b the human ee. Method: Accurate simulation of optical phenomena. Copright Page
More informationRaytracing. COSC 4328/5327 Scott A. King
Raytracing COSC 4328/5327 Scott A. King Basic Ray Casting Method pixels in screen Shoot ray p from the eye through the pixel. Find closest ray-object intersection. Get color at intersection Basic Ray Casting
More informationAnnouncements. Written Assignment 2 out (due March 8) Computer Graphics
Announcements Written Assignment 2 out (due March 8) 1 Advanced Ray Tracing (Recursive) Ray Tracing Antialiasing Motion Blur Distribution Ray Tracing Ray Tracing and Radiosity Assumptions Simple shading
More informationSupplement to Lecture 16
Supplement to Lecture 16 Global Illumination: View Dependent CS 354 Computer Graphics http://www.cs.utexas.edu/~bajaj/ Notes and figures from Ed Angel: Interactive Computer Graphics, 6 th Ed., 2012 Addison
More informationLast Time. Correct Transparent Shadow. Does Ray Tracing Simulate Physics? Does Ray Tracing Simulate Physics? Refraction and the Lifeguard Problem
Graphics Pipeline: Projective Last Time Shadows cast ra to light stop after first intersection Reflection & Refraction compute direction of recursive ra Recursive Ra Tracing maimum number of bounces OR
More informationRay Tracing. Kjetil Babington
Ray Tracing Kjetil Babington 21.10.2011 1 Introduction What is Ray Tracing? Act of tracing a ray through some scene Not necessarily for rendering Rendering with Ray Tracing Ray Tracing is a global illumination
More informationGlobal Illumination. COMP 575/770 Spring 2013
Global Illumination COMP 575/770 Spring 2013 Final Exam and Projects COMP 575 Final Exam Friday, May 3 4:00 pm COMP 770 (and 575 extra credit) Projects Final report due by end of day, May 1 Presentations:
More informationIllumination. Michael Kazhdan ( /657) HB Ch. 14.1, 14.2 FvDFH 16.1, 16.2
Illumination Michael Kazhdan (601.457/657) HB Ch. 14.1, 14.2 FvDFH 16.1, 16.2 Ray Casting Image RayCast(Camera camera, Scene scene, int width, int height) { Image image = new Image(width, height); for
More informationComputer Graphics. Ray Tracing. Copyright Gotsman, Elber, Barequet, Karni, Sheffer. Page 1. Ray-Tracing. Illumination Models
Ra Tracing Ra-Tracing Illumination Models Local: Depends onl on the model, the light sources and the viewer. Eas to simulate. Eamples: Diffuse and specular illumination models. Flat, Gourard and Phong
More informationIndirect Illumination
Indirect Illumination Michael Kazhdan (601.457/657) HB Ch. 14.1, 14.2 FvDFH 16.1, 16.2 Surface Illumination Calculation Multiple light source: 2 Viewer N 1 V I = I E + K A I A + K D N, + K S V, R n I Overview
More informationA Brief Overview of. Global Illumination. Thomas Larsson, Afshin Ameri Mälardalen University
A Brief Overview of Global Illumination Thomas Larsson, Afshin Ameri Mälardalen University 1 What is Global illumination? Global illumination is a general name for realistic rendering algorithms Global
More informationProblem Set 4 Part 1 CMSC 427 Distributed: Thursday, November 1, 2007 Due: Tuesday, November 20, 2007
Problem Set 4 Part 1 CMSC 427 Distributed: Thursday, November 1, 2007 Due: Tuesday, November 20, 2007 Programming For this assignment you will write a simple ray tracer. It will be written in C++ without
More informationIndirect Illumination
Indirect Illumination Michael Kazhdan (601.457/657) HB Ch. 14.1, 14.2 FvDFH 16.1, 16.2 Announcements Midterm on October 17 th Office hours: Misha: Monday 2-3 Malone 229 Sing Chun: Friday 9-10 Malone 216
More informationComputer Graphics. Ray Tracing. Based on slides by Dianna Xu, Bryn Mawr College
Computer Graphics Ray Tracing Based on slides by Dianna Xu, Bryn Mawr College Ray Tracing Example Created by Anto Matkovic Ray Tracing Example Ray Tracing Example Ray Tracing Most light rays do not reach
More informationSo far, we have considered only local models of illumination; they only account for incident light coming directly from the light sources.
11 11.1 Basics So far, we have considered only local models of illumination; they only account for incident light coming directly from the light sources. Global models include incident light that arrives
More informationCS354 Computer Graphics Ray Tracing. Qixing Huang Januray 24th 2017
CS354 Computer Graphics Ray Tracing Qixing Huang Januray 24th 2017 Graphics Pipeline Elements of rendering Object Light Material Camera Geometric optics Modern theories of light treat it as both a wave
More informationRay Tracer Due date: April 27, 2011
Computer graphics Assignment 4 1 Overview Ray Tracer Due date: April 27, 2011 In this assignment you will implement the camera and several primitive objects for a ray tracer, and a basic ray tracing algorithm.
More informationChapter 11 Global Illumination. Part 1 Ray Tracing. Reading: Angel s Interactive Computer Graphics (6 th ed.) Sections 11.1, 11.2, 11.
Chapter 11 Global Illumination Part 1 Ray Tracing Reading: Angel s Interactive Computer Graphics (6 th ed.) Sections 11.1, 11.2, 11.3 CG(U), Chap.11 Part 1:Ray Tracing 1 Can pipeline graphics renders images
More informationLecture 18: Primer on Ray Tracing Techniques
Lecture 18: Primer on Ray Tracing Techniques 6.172: Performance Engineering of Software Systems Joshua Slocum November 16, 2010 A Little Background Image rendering technique Simulate rays of light - ray
More informationRay-Tracing. Misha Kazhdan
Ray-Tracing Misha Kazhdan Ray-Tracing In graphics, we often represent the surface of a 3D shape by a set of triangles. Goal: Ray-Tracing Take a collection of triangles representing a 3D scene and render
More informationRendering: Reality. Eye acts as pinhole camera. Photons from light hit objects
Basic Ray Tracing Rendering: Reality Eye acts as pinhole camera Photons from light hit objects Rendering: Reality Eye acts as pinhole camera Photons from light hit objects Rendering: Reality Eye acts as
More informationConsider a partially transparent object that is illuminated with two lights, one visible from each side of the object. Start with a ray from the eye
Ray Tracing What was the rendering equation? Motivate & list the terms. Relate the rendering equation to forward ray tracing. Why is forward ray tracing not good for image formation? What is the difference
More informationAdvanced Graphics. Path Tracing and Photon Mapping Part 2. Path Tracing and Photon Mapping
Advanced Graphics Path Tracing and Photon Mapping Part 2 Path Tracing and Photon Mapping Importance Sampling Combine importance sampling techniques Reflectance function (diffuse + specular) Light source
More informationRecursive Ray Tracing. Ron Goldman Department of Computer Science Rice University
Recursive Ray Tracing Ron Goldman Department of Computer Science Rice University Setup 1. Eye Point 2. Viewing Screen 3. Light Sources 4. Objects in Scene a. Reflectivity b. Transparency c. Index of Refraction
More informationRAYTRACING. Christopher Peters INTRODUCTION TO COMPUTER GRAPHICS AND INTERACTION. HPCViz, KTH Royal Institute of Technology, Sweden
DH2323 DGI15 INTRODUCTION TO COMPUTER GRAPHICS AND INTERACTION RAYTRACING HPCViz, KTH Royal Institute of Technology, Sweden http://kth.academia.edu/christopheredwardpeters Based on DGI12 notes by Carl
More informationCOMPUTER GRAPHICS AND INTERACTION
DH2323 DGI17 COMPUTER GRAPHICS AND INTERACTION INTRODUCTION TO RAYTRACING Christopher Peters CST, KTH Royal Institute of Technology, Sweden chpeters@kth.se http://kth.academia.edu/christopheredwardpeters
More informationCS 325 Computer Graphics
CS 325 Computer Graphics 04 / 02 / 2012 Instructor: Michael Eckmann Today s Topics Questions? Comments? Illumination modelling Ambient, Diffuse, Specular Reflection Surface Rendering / Shading models Flat
More informationØ Sampling Theory" Ø Fourier Analysis Ø Anti-aliasing Ø Supersampling Strategies" Ø The Hall illumination model. Ø Original ray tracing paper
CS 431/636 Advanced Rendering Techniques Ø Dr. David Breen Ø Korman 105D Ø Wednesday 6PM 8:50PM Presentation 6 5/16/12 Questions from ast Time? Ø Sampling Theory" Ø Fourier Analysis Ø Anti-aliasing Ø Supersampling
More informationIntro to Ray-Tracing & Ray-Surface Acceleration
Lecture 12 & 13: Intro to Ray-Tracing & Ray-Surface Acceleration Computer Graphics and Imaging UC Berkeley Course Roadmap Rasterization Pipeline Core Concepts Sampling Antialiasing Transforms Geometric
More informationComputer Graphics. Lecture 13. Global Illumination 1: Ray Tracing and Radiosity. Taku Komura
Computer Graphics Lecture 13 Global Illumination 1: Ray Tracing and Radiosity Taku Komura 1 Rendering techniques Can be classified as Local Illumination techniques Global Illumination techniques Local
More informationImplementation Issues
Implementation Issues More from Interface point of view Y V U Eye N X Z World Coordinate System (WCS) Viewing Coordinate System (VCS) View Coordinate System (VCS) Viewing coordinate system Position and
More informationIllumination Algorithms
Global Illumination Illumination Algorithms Digital Lighting and Rendering CGT 340 The goal of global illumination is to model all possible paths of light to the camera. Global Illumination Global illumination
More informationModeling Transformations
Modeling Transformations Michael Kazhdan (601.457/657) HB Ch. 5 FvDFH Ch. 5 Overview Ra-Tracing so far Modeling transformations Ra Tracing Image RaTrace(Camera camera, Scene scene, int width, int heigh,
More informationComputer Graphics Lecture 11
1 / 14 Computer Graphics Lecture 11 Dr. Marc Eduard Frîncu West University of Timisoara May 15th 2012 2 / 14 Outline 1 Introduction 2 Transparency 3 Reflection 4 Recap 3 / 14 Introduction light = local
More informationCOMPLETION OF Z-buffer Graphics Pipeline
Z-buffer algorithm for each polygon in model project vertices of polygon onto viewing plane for each pixel inside the projected polygon calculate pixel colour calculate pixel z-value compare pixel z-value
More informationCOMP 175 COMPUTER GRAPHICS. Lecture 11: Recursive Ray Tracer. COMP 175: Computer Graphics April 9, Erik Anderson 11 Recursive Ray Tracer
Lecture 11: Recursive Ray Tracer COMP 175: Computer Graphics April 9, 2018 1/40 Note on using Libraries } C++ STL } Does not always have the same performance. } Interface is (mostly) the same, but implementations
More informationSAMPLING AND NOISE. Increasing the number of samples per pixel gives an anti-aliased image which better represents the actual scene.
SAMPLING AND NOISE When generating an image, Mantra must determine a color value for each pixel by examining the scene behind the image plane. Mantra achieves this by sending out a number of rays from
More informationEDAN30 Photorealistic Computer Graphics. Ray tracing. Michael Doggett Department of Computer Science Lund university. Copyright 2011 Michael Doggett
EDAN30 Photorealistic Computer Graphics Ray tracing Michael Doggett Department of Computer Science Lund university Copyright 2011 Michael Doggett Outline Recursive ray tracing Whitted ray tracing, An improved
More informationShading, lighting, & BRDF Theory. Cliff Lindsay, PHD
Shading, lighting, & BRDF Theory Cliff Lindsay, PHD Overview of today s lecture BRDF Characteristics Lights in terms of BRDFs Classes of BRDFs Ambient light & Shadows in terms of BRDFs Decomposing Reflection
More informationVisual cues to 3D geometry. Light Reflection and Advanced Shading. Shading. Recognizing materials. size (perspective) occlusion shading
Visual cues to 3D geometry Light Reflection and Advanced Shading size (perspective) occlusion shading CS 4620 Lecture 17 1 2 Shading Recognizing materials Variation in observed color across an object strongly
More informationINFOGR Computer Graphics. J. Bikker - April-July Lecture 10: Ground Truth. Welcome!
INFOGR Computer Graphics J. Bikker - April-July 2015 - Lecture 10: Ground Truth Welcome! Today s Agenda: Limitations of Whitted-style Ray Tracing Monte Carlo Path Tracing INFOGR Lecture 10 Ground Truth
More informationSung-Eui Yoon ( 윤성의 )
CS380: Computer Graphics Ray Tracing Sung-Eui Yoon ( 윤성의 ) Course URL: http://sglab.kaist.ac.kr/~sungeui/cg/ Class Objectives Understand overall algorithm of recursive ray tracing Ray generations Intersection
More informationGlobal Rendering. Ingela Nyström 1. Effects needed for realism. The Rendering Equation. Local vs global rendering. Light-material interaction
Effects needed for realism Global Rendering Computer Graphics 1, Fall 2005 Lecture 7 4th ed.: Ch 6.10, 12.1-12.5 Shadows Reflections (Mirrors) Transparency Interreflections Detail (Textures etc.) Complex
More informationLecture 10: Ray tracing
Interactive Computer Graphics Lecture 10: Ray tracing Graphics Lecture 10: Slide 1 Some slides adopted from H. Pfister, Harvard Graphics Lecture 10: Slide 2 Direct and Global Illumination Direct illumination:
More informationGlobal Illumination The Game of Light Transport. Jian Huang
Global Illumination The Game of Light Transport Jian Huang Looking Back Ray-tracing and radiosity both computes global illumination Is there a more general methodology? It s a game of light transport.
More informationThe Rendering Equation. Computer Graphics CMU /15-662
The Rendering Equation Computer Graphics CMU 15-462/15-662 Review: What is radiance? Radiance at point p in direction N is radiant energy ( #hits ) per unit time, per solid angle, per unit area perpendicular
More informationCS580: Ray Tracing. Sung-Eui Yoon ( 윤성의 ) Course URL:
CS580: Ray Tracing Sung-Eui Yoon ( 윤성의 ) Course URL: http://sglab.kaist.ac.kr/~sungeui/gcg/ Recursive Ray Casting Gained popularity in when Turner Whitted (1980) recognized that recursive ray casting could
More informationLighting and Shading Computer Graphics I Lecture 7. Light Sources Phong Illumination Model Normal Vectors [Angel, Ch
15-462 Computer Graphics I Lecture 7 Lighting and Shading February 12, 2002 Frank Pfenning Carnegie Mellon University http://www.cs.cmu.edu/~fp/courses/graphics/ Light Sources Phong Illumination Model
More informationComputer Graphics. Lecture 10. Global Illumination 1: Ray Tracing and Radiosity. Taku Komura 12/03/15
Computer Graphics Lecture 10 Global Illumination 1: Ray Tracing and Radiosity Taku Komura 1 Rendering techniques Can be classified as Local Illumination techniques Global Illumination techniques Local
More informationRecall: Basic Ray Tracer
1 Recall: Ray Tracing Generate an image by backwards tracing the path of light through pixels on an image plane Simulate the interaction of light with objects Recall: Basic Ray Tracer Trace a primary ray
More informationIntroduction to Visualization and Computer Graphics
Introduction to Visualization and Computer Graphics DH2320, Fall 2015 Prof. Dr. Tino Weinkauf Introduction to Visualization and Computer Graphics Visibility Shading 3D Rendering Geometric Model Color Perspective
More informationRay tracing. EECS 487 March 19,
Ray tracing EECS 487 March 19, 2007 http://radsite.lbl.gov/radiance/book/ 1 Conventional pipeline (rasterization) For each triangle Compute lighting at vertices For each pixel within triangle Compute interpolated
More informationComputer Graphics (CS 4731) Lecture 16: Lighting, Shading and Materials (Part 1)
Computer Graphics (CS 4731) Lecture 16: Lighting, Shading and Materials (Part 1) Prof Emmanuel Agu Computer Science Dept. Worcester Polytechnic Institute (WPI) Why do we need Lighting & shading? Sphere
More informationComputer Graphics (CS 543) Lecture 7b: Intro to lighting, Shading and Materials + Phong Lighting Model
Computer Graphics (CS 543) Lecture 7b: Intro to lighting, Shading and Materials + Phong Lighting Model Prof Emmanuel Agu Computer Science Dept. Worcester Polytechnic Institute (WPI) Why do we need Lighting
More informationThe Rendering Equation and Path Tracing
The Rendering Equation and Path Tracing Louis Feng April 22, 2004 April 21, 2004 Realistic Image Synthesis (Spring 2004) 1 Topics The rendering equation Original form Meaning of the terms Integration Path
More informationEffects needed for Realism. Computer Graphics (Fall 2008) Ray Tracing. Ray Tracing: History. Outline
Computer Graphics (Fall 2008) COMS 4160, Lecture 15: Ray Tracing http://www.cs.columbia.edu/~cs4160 Effects needed for Realism (Soft) Shadows Reflections (Mirrors and Glossy) Transparency (Water, Glass)
More informationReflection and Shading
Reflection and Shading R. J. Renka Department of Computer Science & Engineering University of North Texas 10/19/2015 Light Sources Realistic rendering requires that we model the interaction between light
More informationAssignment 6: Ray Tracing
Assignment 6: Ray Tracing Programming Lab Due: Monday, April 20 (midnight) 1 Introduction Throughout this semester you have written code that manipulated shapes and cameras to prepare a scene for rendering.
More informationLighting and Reflectance COS 426
ighting and Reflectance COS 426 Ray Casting R2mage *RayCast(R3Scene *scene, int width, int height) { R2mage *image = new R2mage(width, height); for (int i = 0; i < width; i++) { for (int j = 0; j < height;
More informationIllumination. Courtesy of Adam Finkelstein, Princeton University
llumination Courtesy of Adam Finkelstein, Princeton University Ray Casting mage RayCast(Camera camera, Scene scene, int width, int height) { mage image = new mage(width, height); for (int i = 0; i < width;
More informationCS 6620 Shading. Steve Parker Peter Shirley
CS 6620 Shading Steve Parker Peter Shirley Shading models Lambert s cosine law Light reaching surface is proportional to projected area: cos θ Lambertian shading Comes from a rough surface (at microscopic
More informationModeling Transformations
Modeling Transformations Michael Kazhdan (601.457/657) HB Ch. 5 FvDFH Ch. 5 Announcement Assignment 2 has been posted: Due: 10/24 ASAP: Download the code and make sure it compiles» On windows: just build
More informationFinal Project: Real-Time Global Illumination with Radiance Regression Functions
Volume xx (200y), Number z, pp. 1 5 Final Project: Real-Time Global Illumination with Radiance Regression Functions Fu-Jun Luan Abstract This is a report for machine learning final project, which combines
More informationGlobal Illumination CS334. Daniel G. Aliaga Department of Computer Science Purdue University
Global Illumination CS334 Daniel G. Aliaga Department of Computer Science Purdue University Recall: Lighting and Shading Light sources Point light Models an omnidirectional light source (e.g., a bulb)
More informationLocal Illumination. CMPT 361 Introduction to Computer Graphics Torsten Möller. Machiraju/Zhang/Möller
Local Illumination CMPT 361 Introduction to Computer Graphics Torsten Möller Graphics Pipeline Hardware Modelling Transform Visibility Illumination + Shading Perception, Interaction Color Texture/ Realism
More informationIllumination Models and Shading
1 Illumination Models and Shading Motivation: In order to produce realistic images, we must simulate the appearance of surfaces under various lighting conditions. Illumination Models: Given the illumination
More informationReview for Ray-tracing Algorithm and Hardware
Review for Ray-tracing Algorithm and Hardware Reporter: 邱敬捷博士候選人 Lan-Da Van ( 范倫達 ), Ph. D. Department of Computer Science National Chiao Tung University Taiwan, R.O.C. Summer, 2017 1 2017/7/26 Outline
More informationLecture 17: Recursive Ray Tracing. Where is the way where light dwelleth? Job 38:19
Lecture 17: Recursive Ray Tracing Where is the way where light dwelleth? Job 38:19 1. Raster Graphics Typical graphics terminals today are raster displays. A raster display renders a picture scan line
More informationChapter 5 Mirror and Lenses
Chapter 5 Mirror and Lenses Name: 5.1 Ray Model of Light Another model for light is that it is made up of tiny particles called. Photons travel in perfect, lines from a light source This model helps us
More informationChapter 11. Caustics and Global Illumination
11 and Global Illumination Chapter 11 Direct illumination occurs when a light source directly illuminates an object or objects in a scene. Indirect illumination occurs if light illuminates objects by reflection
More informationCOMP environment mapping Mar. 12, r = 2n(n v) v
Rendering mirror surfaces The next texture mapping method assumes we have a mirror surface, or at least a reflectance function that contains a mirror component. Examples might be a car window or hood,
More informationRay Tracing. Quiz Discussion. Announcements: Final Projects. Last Time? Durer s Ray Casting Machine. Today
Qui Discussion a Tracing Announcements: Final Projects Last Time? Everone should post one or more ideas for a final project on the discussion forum (it was our assignment over Spring Break) Connect with
More informationComplex Shading Algorithms
Complex Shading Algorithms CPSC 414 Overview So far Rendering Pipeline including recent developments Today Shading algorithms based on the Rendering Pipeline Arbitrary reflection models (BRDFs) Bump mapping
More informationMotivation. Sampling and Reconstruction of Visual Appearance. Effects needed for Realism. Ray Tracing. Outline
Sampling and Reconstruction of Visual Appearance CSE 274 [Fall 2018], Special Lecture Ray Tracing Ravi Ramamoorthi http://www.cs.ucsd.edu/~ravir Motivation Ray Tracing is a core aspect of both offline
More informationRay Tracing. CS334 Fall Daniel G. Aliaga Department of Computer Science Purdue University
Ray Tracing CS334 Fall 2013 Daniel G. Aliaga Department of Computer Science Purdue University Ray Casting and Ray Tracing Ray Casting Arthur Appel, started around 1968 Ray Tracing Turner Whitted, started
More informationShading, Advanced Rendering. Week 7, Wed Feb 28
University of British Columbia CPSC 314 Computer Graphics Jan-Apr 2007 Tamara Munzner Shading, Advanced Rendering Week 7, Wed Feb 28 http://www.ugrad.cs.ubc.ca/~cs314/vjan2007 Reading for Today and Tomorrow
More informationRay Tracing. Johns Hopkins Department of Computer Science Course : Rendering Techniques, Professor: Jonathan Cohen
Ray Tracing Recursive Ray Tracing Gather light from various directions by tracing rays Each pixel shows light at a surface trace ray from eye to surface Each surface illuminated by lights and other surfaces
More informationTopic 12: Texture Mapping. Motivation Sources of texture Texture coordinates Bump mapping, mip-mapping & env mapping
Topic 12: Texture Mapping Motivation Sources of texture Texture coordinates Bump mapping, mip-mapping & env mapping Texture sources: Photographs Texture sources: Procedural Texture sources: Solid textures
More informationCOMP30019 Graphics and Interaction Ray Tracing
COMP30019 Graphics and Interaction Ray Tracing Department of Computer Science and Software Engineering The Lecture outline Ray tracing Recursive Ray Tracing Binary Space Partition (BSP) Trees Refraction
More informationRaytracing & Epsilon. Today. Last Time? Forward Ray Tracing. Does Ray Tracing Simulate Physics? Local Illumination
Raytracing & Epsilon intersects light @ t = 25.2 intersects sphere1 @ t = -0.01 & Monte Carlo Ray Tracing intersects sphere1 @ t = 10.6 Solution: advance the ray start position epsilon distance along the
More informationRaycast Rendering Maya 2013
2000 2012 Michael O'Rourke Raycast Rendering Maya 2013 (See also the Intro to Lights and Rendering tutorial for an introduction to the basics of rendering an image) Concept There are several algorithms
More informationComputer Graphics. Si Lu. Fall uter_graphics.htm 11/22/2017
Computer Graphics Si Lu Fall 2017 http://web.cecs.pdx.edu/~lusi/cs447/cs447_547_comp uter_graphics.htm 11/22/2017 Last time o Splines 2 Today o Raytracing o Final Exam: 14:00-15:30, Novermber 29, 2017
More informationSpecular reflection. Lighting II. Snell s Law. Refraction at boundary of media
Specular reflection Lighting II CS 465 Lecture 19 Smooth surfaces of pure materials have ideal specular reflection (said this before) Metals (conductors) and dielectrics (insulators) behave differently
More informationIntroduction Ray tracing basics Advanced topics (shading) Advanced topics (geometry) Graphics 2010/2011, 4th quarter. Lecture 11: Ray tracing
Lecture 11 Ray tracing Introduction Projection vs. ray tracing Projection Ray tracing Rendering Projection vs. ray tracing Projection Ray tracing Basic methods for image generation Major areas of computer
More informationGlobal Illumination. Connelly Barnes CS 4810: Graphics
Global Illumination Connelly Barnes CS 4810: Graphics Acknowledgment: slides by Jason Lawrence, Misha Kazhdan, Allison Klein, Tom Funkhouser, Adam Finkelstein and David Dobkin Overview Direct Illumination
More informationChapter 7 - Light, Materials, Appearance
Chapter 7 - Light, Materials, Appearance Types of light in nature and in CG Shadows Using lights in CG Illumination models Textures and maps Procedural surface descriptions Literature: E. Angel/D. Shreiner,
More informationPhoton Mapping. Due: 3/24/05, 11:59 PM
CS224: Interactive Computer Graphics Photon Mapping Due: 3/24/05, 11:59 PM 1 Math Homework 20 Ray Tracing 20 Photon Emission 10 Russian Roulette 10 Caustics 15 Diffuse interreflection 15 Soft Shadows 10
More informationCENG 477 Introduction to Computer Graphics. Ray Tracing: Shading
CENG 477 Introduction to Computer Graphics Ray Tracing: Shading Last Week Until now we learned: How to create the primary rays from the given camera and image plane parameters How to intersect these rays
More informationRay Tracing. Last Time? Today. Ray Casting. Durer s Ray Casting Machine. Reading for Today
Last Time? a Tracing Keframing Procedural nimation Phsicall-Based nimation Forward and Inverse Kinematics Motion Capture Two solutions Toda eading for Toda a Casting "n improved illumination model for
More informationOther Rendering Techniques CSE 872 Fall Intro You have seen Scanline converter (+z-buffer) Painter s algorithm Radiosity CSE 872 Fall
Other Rendering Techniques 1 Intro You have seen Scanline converter (+z-buffer) Painter s algorithm Radiosity 2 Intro Some more Raytracing Light maps Photon-map Reyes Shadow maps Sahdow volumes PRT BSSRF
More information