Lab Sessions Photorealistic Rendering (Advanced Computer Graphics)

Transcription

1 Lab Sessions Photorealistic Rendering (Advanced Computer Graphics) Tobias Isenberg

2 Lab sessions: Introduction implementations: raytracer some information on assignments continued work on the next assignments ask questions presence is mandatory work in pairs of two

3 Grading and rules grading of the extension part: 90 points for assignments (15 points each assignment) 100% of required assignments equals 18 to get to a grade of 20 you can do bonus tasks presence is mandatory; when sick me ahead of time strict deadlines: send in coding results day before lab problems? then talk to me/ me ahead of time

4 Deadlines deadline is 23:59 CET of the day before the lab session strict deadlines: 10% reduction per day late example: materials sent on Sunday for Monday class: full 100% materials sent in the morning of lab session day: -10% materials sent on Wednesday: -30% etc. I did not know how to do this. The compiler on my machine did not work. etc. are not accepted

5 What to submit for the assignments directory with full source code of your raytracer should compile on Windows should be well commented (in English) directory with Windows binary of your raytracer include your adjusted yaml file(s) to trace final scene script/batch file to produce all results for the given assignment Windows RELEASE binaries directory with result images (include cool examples & errors) readme.txt: names, assignment number, notes if needed

6 What to submit for the assignments example: raytracer/* (includes all the necessary source files) raytracer-binary/ raytracer-binary/runme.bat raytracer-binary/myscene.yaml raytracer-binary/raytracer.exe results/*.png readme.txt put all the materials into a single archive use *.zip or *.7z formats file name: assignment{1-7}_lastname_lastname.{zip 7z}

7 How to submit the assignments upload archive file to external server own web server cloud storage (Dropbox, Box.com, Google Drive, OneDrive, etc.) link to the package before the deadline to (do NOT use my p-sud.fr address!) subject line: [CG Assignment] Assignment X, Name & Name e.g., [CG Assignment] Assignment 1, Smith & Jones

8 Helper function: boolean ready_to_submit_assignment() { } boolean fully_understood_slides; do { fully_understood_slides = read_and_understand_tutorial_slide(5) && read_and_understand_tutorial_slide(6) && read_and_understand_tutorial_slide(7); } while (fully_understood_slides!= true); return (fully_understood_slides);

9 Raytracer: implementation goals own implementations of core computer graphics concepts global illumination concept several aspects of simple CG many extensions possible to explore other advanced topics

10 Bonus tasks several bonus tasks suggested they get you to > 18 feel free to suggest additional bonus tasks

11 Bonus tasks several bonus tasks suggested they get you to > 18 feel free to suggest additional bonus tasks

12 Bonus tasks several bonus tasks suggested they get you to > 18 feel free to suggest additional bonus tasks

13 Raytracer

14 Raytracer step-by-step

15 Raytracer step-by-step

16 Raytracer step-by-step

17 Raytracer step-by-step

18 Raytracer step-by-step

19 Raytracer step-by-step

20 Raytracer step-by-step

21 Raytracer step-by-step

22 Raytracer step-by-step

23 Raytracer step-by-step

24 Raytracer step-by-step

25 Raytracer step-by-step

26 Raytracer step-by-step

27 Raytracer step-by-step

28 Raytracer step-by-step

29 Raytracer step-by-step

30 Raytracer project page

31 Raytracer framework we provide basic C++ framework other languages (Java, C#, Turing machine, ) are allowed if you convert the framework it works with the same scene descriptions it compiles in the lab or on my laptop I ok ed it it is not allowed to use other people s code/raytracers (beyond basic framework) copy other team s results

32 Raytracer: building and running Compile: Run: View result: $ make $./raytracer scene01.yaml $./raytracer scene01.yaml scene01.png $ kview scene01.png

33 Raytracer: getting started look at included readme file look at example scene description: scene01.yaml compile & run w/o changes follow exercise

34 Raytracer assignments details

35 Raytracer: assignment implement intersect() function implement normal calculation for the spere (no visual changes) remember (look up) the definition of the dot product

36 Raytracer: assignment implement the diffuse term of Phong's lighting model modify Scene::trace(Ray) in the file scene.cpp Phong diffuse: k d I (L N)

37 Raytracer: assignment implement ambient and specular parts of the Phong model Phong ambient: k a I Phong specular: k s I (R V) n

38 Raytracer: assignment test your raytracer with the provided scene file

39 Compilers compilers packaged with your preferred Linux distribution Microsoft Visual Studio Community: free for academic use Microsoft Visual Studio Express: free to use

40 Microsoft Operating Systems use MS Academic Alliance/ MS Dreamspark/MS Imagine licenses (for free for students!) Université Paris Sud: = ab9b-e d d8897 Polytech Paris Sud?

41 Boy, this is too much to program! 1984: Paul Heckbert s challenge for shortest raytracer Andrew Kensler s business card #include <stdlib.h> // card > aek.ppm #include <stdio.h> #include <math.h> typedef int i;typedef float f;struct v{ f x,y,z;v operator+(v r){return v(x+r.x,y+r.y,z+r.z);}v operator*(f r){return v(x*r,y*r,z*r);}f operator%(v r){return x*r.x+y*r.y+z*r.z;}v(){}v operator^(v r ){return v(y*r.z-z*r.y,z*r.x-x*r.z,x*r. y-y*r.x);}v(f a,f b,f c){x=a;y=b;z=c;}v operator!(){return*this*(1/sqrt(*this%* this));}};i G[]={247570,280596,280600, ,18578,18577,231184,16,16};f R(){ return(f)rand()/rand_max;}i T(v o,v d,f &t,v&n){t=1e9;i m=0;f p=-o.z/d.z;if(.01 <p)t=p,n=v(0,0,1),m=1;for(i k=19;k--;) for(i j=9;j--;)if(g[j]&1<<k){v p=o+v(-k,0,-j-4);f b=p%d,c=p%p-1,q=b*b-c;if(q>0 ){f s=-b-sqrt(q);if(s<t&&s>.01)t=s,n=!( p+d*t),m=2;}}return m;}v S(v o,v d){f t ;v n;i m=t(o,d,t,n);if(!m)return v(.7,.6,1)*pow(1-d.z,4);v h=o+d*t,l=!(v(9+r( ),9+R(),16)+h*-1),r=d+n*(n%d*-2);f b=l% n;if(b<0 T(h,l,t,n))b=0;f p=pow(l%r*(b >0),99);if(m&1){h=h*.2;return((i)(ceil( h.x)+ceil(h.y))&1?v(3,1,1):v(3,3,3))*(b *.2+.1);}return v(p,p,p)+s(h,r)*.5;}i main(){printf("p ");v g=!v (-6,-16,0),a=!(v(0,0,1)^g)*.002,b=!(g^a )*.002,c=(a+b)*-256+g;for(i y=512;y--;) for(i x=512;x--;){v p(13,13,13);for(i r =64;r--;){v t=a*(r()-.5)*99+b*(r()-.5)* 99;p=S(v(17,16,8)+t,!(t*-1+(a*(R()+x)+b *(y+r())+c)*16))*3.5+p;}printf("%c%c%c",(i)p.x,(i)p.y,(i)p.z);}} see for more information

42 It just doesn t work, but my code is ok!

43 Rest of today s session set up raytracer get framework and extract compile run view image understand first raytracer assignment start coding Assignment 1 (and beyond)