ray tracing
play

Ray Tracing CS 148: Summer 2016 Introduction of Graphics and - PowerPoint PPT Presentation

Jan 26, 2024 •237 likes •971 views

Ray Tracing CS 148: Summer 2016 Introduction of Graphics and Imaging Zahid Hossain https://en.wikipedia.org/wiki/Ray_tracing_%28graphics%29 Paths of Light http://software.intel.com/file/37491 2 CS 148: Introduction to Computer Graphics and

  1. Ray Tracing CS 148: Summer 2016 Introduction of Graphics and Imaging Zahid Hossain https://en.wikipedia.org/wiki/Ray_tracing_%28graphics%29

  2. Paths of Light http://software.intel.com/file/37491 2 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  3. Paths of Light Light source http://software.intel.com/file/37491 3 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  4. Paths of Light Light interacts with objects in scene http://software.intel.com/file/37491 4 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  5. Paths of Light Image plane http://software.intel.com/file/37491 5 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  6. Problem ?? Most light do not reach the camera http://software.intel.com/file/37491 6 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  7. Forward Ray Tracing Trace rays from light to camera 7 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  8. Backward Ray Tracing Trace rays from light to camera 8 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  9. Ray Tracing Algorithm Trace a ray through each pixel • Intersect with geometry • Trace a shadow ray to the light • Shade the pixel • http://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-ray-tracing/implementing-the-raytracing-algorithm 9 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  10. Ray Tracing Algorithm Trace a ray through each pixel • Intersect with geometry • Trace a shadow ray to the light • Shade the pixel • Shadow if light not visible • http://www.scratchapixel.com 10 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  11. Simple to implement • For a simple case: • http://www.scratchapixel.com/code.php?id=3&origin=/l essons/3d-basic-rendering/introduction-to-ray-tracing Few lines of code; already impressive 11 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  12. Recursive Ray Tracing http://www.scratchapixel.com/images/upload/ray-tracing-refresher/rt-whitted-example.png? 12 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  13. Whitted Ray Tracing T. Whitted, Communications of ACM, 1980 Render Time: 74 minutes 13 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  14. Today: nVidia OptiX Render Time: 16 ms ! (60 fps): my Macbook Pro nVidia GTX M750 14 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  15. Today: Realism http://images.povcomp.com/entries/images/105_main.jpg 15 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  16. Today: Realism http://images.povcomp.com/entries/images/105_main.jpg 16 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  17. Rasterizer Vs Ray-Tracing Rasterization for (each object in scene) drawObject(); 17 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  18. Rasterizer Vs Ray-Tracing Rasterization for (each object in scene) drawObject(); Ray Tracing for (each pixel in image) sendRay(); 18 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  19. Rasterization Vs Ray Tracing Rasterization for (each object in scene) drawObject(); Ray Tracing for (each pixel in image) sendRay(); 19 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  20. Math for Ray Tracing 20 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  21. Ray 21 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  22. Ray 22 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  23. Ray 23 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  24. Generating a Ray No perspective transformation needed! 24 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  25. Ray Intersection With a Sphere 25 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  26. Ray Intersection With a Sphere 26 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  27. Ray Intersection with a Sphere 27 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  28. Ray Intersection with a Sphere 28 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  29. Ray Intersection With a Sphere 29 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  30. Ray Intersection With a Sphere 30 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  31. Ray Intersection With a Sphere If t* < 0 then what ? 31 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  32. Sphere Surface Normal 32 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  33. Surface Normal http://designjk.files.wordpress.com/2011/12/teapot-decorated.png 33 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  34. Shadow Ray / Light Ray 34 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  35. Reflection Vector (Recap) ~ v i Note the directions ! http://graphics.stanford.edu/courses/cs148-10-summer/docs/2006--degreve--reflection_refraction.pdf 35 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  36. Refraction Vector (Extra) ~ v i http://graphics.stanford.edu/courses/cs148-10-summer/docs/2006--degreve--reflection_refraction.pdf 36 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  37. Shadows http://2.bp.blogspot.com/-2CpxoSdtNE8/T5nMClgobpI/AAAAAAAAAJ4/XgaZ168HpKg/s1600/P0008_I004.png 37 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  38. Shadow Acne / Peter Panning Real life issues ! 38 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  39. Object-Oriented Ray Tracing abstract class surface virtual hit-record hit(ray, t0, t1) virtual box bounding-box() struct hit-record vector3d position, normal surface hit-surface … abstract class material color evaluate(in-ray, normal, pos) … 39 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  40. Recursive Ray Tracing color ray-trace(ray r) hit-record record = intersect(r); … if (record.hit-surface.is-reflective) ray reflected-ray = reflect(r,record.normal); color reflected-color = ray-trace(reflected-ray); compute-spectral-component( reflected-color); … 40 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  41. Recursion Depth Lots of bounces Fewer bounces Avoid infinite recursion: stop after nth depth (typically n=5) 41 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  42. Aliasing: Still Problematic! 42 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain http://www.hackification.com/2008/08/31/experiments-in-ray-tracing-part-8-anti-aliasing/

  43. Distribution Ray Tracing Scatter rays to make ray tracing less crisp. 43 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  44. Distribution Antialiasing Multiple rays per pixel 44 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  45. Distribution Antialiasing Moiré pattern Patterned Noise http://upload.wikimedia.org/wikipedia/commons/f/fb/Moire_pattern_of_bricks_small.jpg 45 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  46. Random Sampling We are less sensitive to granular noise http://en.wikipedia.org/wiki/File:Moire_pattern_of_bricks.jpg 46 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  47. Not Enough Samples! ? ? ? 47 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  48. Stratified (Jittered) Sampling One ray per box 48 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  49. Accelerated Ray Tracing Bounding Volume Hierarchy (BVH) http://sopra.le-gousteau.de/images/2/2e/Bv_bvh_bspheres.jpg http://graphics.ucsd.edu/courses/rendering/2004/ssaha/index_files/finalbvh.jfif 49 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

  50. Accelerated Ray Tracing Bounding Volume Hierarchy (BVH) http://sopra.le-gousteau.de/images/2/2e/Bv_bvh_bspheres.jpg http://graphics.ucsd.edu/courses/rendering/2004/ssaha/index_files/finalbvh.jfif 50 CS 148: Introduction to Computer Graphics and Imaging (Summer 2016) – Zahid Hossain

Recommend

Advanced Ray Tracing 1 2/8/2006 Distributed Ray Tracing Distributed ray tracing is an

Advanced Ray Tracing 1 2/8/2006 Distributed Ray Tracing Distributed ray tracing is an

Advanced Ray Tracing 1 2/8/2006 Distributed Ray Tracing Distributed ray tracing is an elegant technique that tackles many problems at once Stochastic ray tracing: distribute rays stochastically across pixel Distributed ray tracing:

328 views • 8 slides
MIT 6.837 - Ray Tracing Ray Tracing MIT EECS 6.837 Most slides are taken from Frdo Durand and

MIT 6.837 - Ray Tracing Ray Tracing MIT EECS 6.837 Most slides are taken from Frdo Durand and

MIT 6.837 - Ray Tracing Ray Tracing MIT EECS 6.837 Most slides are taken from Frdo Durand and Barb Cutler Some slides courtesy of Leonard McMillan 1 2 Ray Tracing Ray Tracing Ray Tracing kills two birds with one stone: Solves the

327 views • 11 slides
Ray Tracing 1 Ray Tracing Ray Tracing kills two birds with one stone: Solves the Hidden

Ray Tracing 1 Ray Tracing Ray Tracing kills two birds with one stone: Solves the Hidden

Ray Tracing 1 Ray Tracing Ray Tracing kills two birds with one stone: Solves the Hidden Surface Removal problem Evaluates an improved global illumination model shadows ideal specular reflections ideal specular refractions

586 views • 19 slides
Introduction to Path Tracing Marc Sunet Table of contents From Ray Tracing to Path Tracing The

Introduction to Path Tracing Marc Sunet Table of contents From Ray Tracing to Path Tracing The

Introduction to Path Tracing Marc Sunet Table of contents From Ray Tracing to Path Tracing The Rendering Equation Monte Carlo Integration A Basic Path Tracer Variance Reduction and Optimisation Techniques Additional Resources Plan From Ray

1.08k views • 54 slides
Computer Graphics - Ray-Tracing II - Hendrik Lensch Computer Graphics WS07/08 Ray Tracing II

Computer Graphics - Ray-Tracing II - Hendrik Lensch Computer Graphics WS07/08 Ray Tracing II

Computer Graphics - Ray-Tracing II - Hendrik Lensch Computer Graphics WS07/08 Ray Tracing II Overview Last lecture Ray tracing I Basic ray tracing What is possible? Recursive ray tracing algorithm Intersection

873 views • 84 slides
Ray-tracing Acceleration Motivation Distribution Ray Tracing Soft shadows

Ray-tracing Acceleration Motivation Distribution Ray Tracing Soft shadows

Ray-tracing Acceleration Motivation Distribution Ray Tracing Soft shadows Acceleration Data Structures Antialiasing (getting rid of jaggies) for Ray Tracing Glossy reflection Motion blur Depth of field (focus)

940 views • 10 slides
Welcome 1 Ray tracing part I of the course 2 Ray tracing part I of the course Why

Welcome 1 Ray tracing part I of the course 2 Ray tracing part I of the course Why

Graphics (INFOGR), 2018-19, Block IV, lecture 1 Deb Panja Today: Vectors and vector algebra Welcome 1 Ray tracing part I of the course 2 Ray tracing part I of the course Why vectors? you need to shoot a lot of such rays!

594 views • 47 slides
Ray Tracing Basics CSE 681 Autumn 11 Han-Wei Shen Forward Ray Tracing We shoot a large

Ray Tracing Basics CSE 681 Autumn 11 Han-Wei Shen Forward Ray Tracing We shoot a large

Ray Tracing Basics CSE 681 Autumn 11 Han-Wei Shen Forward Ray Tracing We shoot a large number of photons Problem? Backward Tracing For every pixel Construct a ray from the eye For every object in the scene Find intersection with the ray

695 views • 55 slides
Knowledge Tracing Machines: Factorization Machines for Knowledge Tracing Jill-Jnn Vie Hisashi

Knowledge Tracing Machines: Factorization Machines for Knowledge Tracing Jill-Jnn Vie Hisashi

Introduction Knowledge Tracing Encoding existing models Knowledge Tracing Machines Results Conclusion Knowledge Tracing Machines: Factorization Machines for Knowledge Tracing Jill-Jnn Vie Hisashi Kashima KJMLW, February 22, 2019

698 views • 51 slides
Advanced Ray Tracing Stochastic ray tracing: distribute rays stochastically across pixel

Advanced Ray Tracing Stochastic ray tracing: distribute rays stochastically across pixel

Distributed Ray Tracing Distributed ray tracing is an elegant technique that tackles many problems at once Advanced Ray Tracing Stochastic ray tracing: distribute rays stochastically across pixel Distributed ray tracing: distribute

263 views • 3 slides
Computer Graphics - Ray Tracing I - Hendrik Lensch Computer Graphics WS07/08 Ray Tracing I

Computer Graphics - Ray Tracing I - Hendrik Lensch Computer Graphics WS07/08 Ray Tracing I

Computer Graphics - Ray Tracing I - Hendrik Lensch Computer Graphics WS07/08 Ray Tracing I Overview Last Lecture Introduction Now Ray tracing I Background Basic ray tracing What is possible? Recursive

1.09k views • 56 slides
Relativistic Ray Tracing in Julia Ryan McKinnon November 30, 2015 Introduction Ray tracing is

Relativistic Ray Tracing in Julia Ryan McKinnon November 30, 2015 Introduction Ray tracing is

Relativistic Ray Tracing in Julia Ryan McKinnon November 30, 2015 Introduction Ray tracing is used in many scientific fields to visualize 3D data Relativistic ray tracing is needed to model a black holes warped spacetime under general

333 views • 9 slides
Ray Tracing MIT EECS 6.837 Most slides are taken from Frdo Durand and Barb Cutler Some slides

Ray Tracing MIT EECS 6.837 Most slides are taken from Frdo Durand and Barb Cutler Some slides

Ray Tracing MIT EECS 6.837 Most slides are taken from Frdo Durand and Barb Cutler Some slides courtesy of Leonard McMillan 1 2 3 4 Ray Tracing Ray Tracing Ray Tracing kills two birds with one stone: Solves the Hidden Surface

345 views • 10 slides
Logistics Paper summaries on Ray Tracing Any takers? Advanced Ray Tracing About the

Logistics Paper summaries on Ray Tracing Any takers? Advanced Ray Tracing About the

Logistics Paper summaries on Ray Tracing Any takers? Advanced Ray Tracing About the Animation Course Announcement 12-hour programming competition Tenatively scheduled for: Sponsored by Computer Science House &amp; Redbull

491 views • 11 slides
Ray tracing Computer Graphics 2006 Based on slides by: Santa Clara University Ray Tracing

Ray tracing Computer Graphics 2006 Based on slides by: Santa Clara University Ray Tracing

Ray tracing Computer Graphics 2006 Based on slides by: Santa Clara University Ray Tracing What is it? Why use it? Basics Advanced topics References Ray-Tracing: Why Use It? Simulate rays of light Produces natural

705 views • 59 slides
Ray Tracing Ray Tracing Classical geometric optics technique Extremely versatile

Ray Tracing Ray Tracing Classical geometric optics technique Extremely versatile

Utah School of Computing Spring 2011 Ray Tracing Ray Tracing Classical geometric optics technique Extremely versatile Historically viewed as expensive CS5600 Computer Graphics Week 11 Good for special effects From Rich

479 views • 12 slides
Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing

Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing

So You Want to Write a Ray Tracer Checkpoint 7 Tone Reproduction Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing Assignment Seven checkpoints Setting the Scene Camera Modeling

454 views • 17 slides
Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing

Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing

So You Want to Write a Ray Tracer Checkpoint 6 Refraction Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing Assignment Seven checkpoints 1. Setting the Scene 2. Camera Modeling 3. Basic

301 views • 9 slides
Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing

Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing

So You Want to Write a Ray Tracer Checkpoint 3 Basic Shading Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing Assignment Seven checkpoints Setting the Scene Camera Modeling

348 views • 11 slides
1 1 0 0 Ray Tracing Ray tracing is a method to produce realistic images; it determines visible

1 1 0 0 Ray Tracing Ray tracing is a method to produce realistic images; it determines visible

1 1 0 0 Ray Tracing Ray tracing is a method to produce realistic images; it determines visible sur- faces in an image at the pixel level (Appel, 1968; Kay &amp; Greenberg, 1979; Whit- ted, 1980). Unlike the z-buffer and BSP

764 views • 38 slides
1 Ray Tracing History Ray Tracing History From SIGGRAPH 18 Outline in Code Image Raytrace

1 Ray Tracing History Ray Tracing History From SIGGRAPH 18 Outline in Code Image Raytrace

Effects needed for Realism Computer Graphics (Soft) Shadows Reflections (Mirrors and Glossy) CSE 167 [Win 19], Lecture 15: Ray Tracing Transparency (Water, Glass) Ravi Ramamoorthi Interreflections (Color Bleeding)

452 views • 8 slides
61A Extra Lecture 9 Announcements Pixels (Demo) Ray Tracing Ray Tracing A technique for

61A Extra Lecture 9 Announcements Pixels (Demo) Ray Tracing Ray Tracing A technique for

61A Extra Lecture 9 Announcements Pixels (Demo) Ray Tracing Ray Tracing A technique for displaying a 3D scene on a 2D screen by tracing a path through every pixel 5 Ray Tracing A technique for displaying a 3D scene on a 2D screen by tracing

326 views • 32 slides
Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing

Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing

So You Want to Write a Ray Tracer Checkpoint 6 Refraction Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing Assignment Seven checkpoints Setting the Scene Camera Modeling

476 views • 10 slides
Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing

Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing

So You Want to Write a Ray Tracer Checkpoint 4 Procedural Shading Ray Tracing Assignment Goal is to reproduce the following Whitted, 1980 1 Ray Tracing Assignment Seven checkpoints Setting the Scene Camera

234 views • 6 slides

More recommend