GitHub - andrewmo2014/Ray-Casting: 6.837 Computer Graphics Assignment4: Ray Casting

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Name		Name	Last commit message	Last commit date
Latest commit History 1 Commits
tex		tex
vecmath		vecmath
1.tga		1.tga
10.tga		10.tga
11.tga		11.tga
12.tga		12.tga
13.tga		13.tga
1soln.tga		1soln.tga
2.tga		2.tga
2soln.tga		2soln.tga
3.tga		3.tga
3soln.tga		3soln.tga
4.tga		4.tga
4soln.tga		4soln.tga
5.tga		5.tga
5soln.tga		5soln.tga
6.tga		6.tga
6soln.tga		6soln.tga
7.tga		7.tga
7soln.tga		7soln.tga
8.tga		8.tga
8soln.tga		8soln.tga
9.tga		9.tga
9soln.tga		9soln.tga
Camera.h		Camera.h
Group.cpp		Group.cpp
Group.h		Group.h
Group.o		Group.o
Hit.h		Hit.h
Image.cpp		Image.cpp
Image.h		Image.h
Image.o		Image.o
Light.h		Light.h
Makefile		Makefile
Material.cpp		Material.cpp
Material.h		Material.h
Material.o		Material.o
Mesh.cpp		Mesh.cpp
Mesh.hpp		Mesh.hpp
Mesh.o		Mesh.o
Object3D.h		Object3D.h
OrthoCamera.cpp		OrthoCamera.cpp
OrthoCamera.o		OrthoCamera.o
PerspectiveCamera.cpp		PerspectiveCamera.cpp
PerspectiveCamera.o		PerspectiveCamera.o
Pipe.cpp		Pipe.cpp
Pipe.h		Pipe.h
Pipe.o		Pipe.o
Plane.cpp		Plane.cpp
Plane.h		Plane.h
Plane.o		Plane.o
README.txt		README.txt
Ray.h		Ray.h
SceneParser.cpp		SceneParser.cpp
SceneParser.h		SceneParser.h
SceneParser.o		SceneParser.o
Sphere.cpp		Sphere.cpp
Sphere.h		Sphere.h
Sphere.o		Sphere.o
Transform.cpp		Transform.cpp
Transform.h		Transform.h
Transform.o		Transform.o
Triangle.cpp		Triangle.cpp
Triangle.h		Triangle.h
Triangle.o		Triangle.o
VecUtils.h		VecUtils.h
_1d.tga		_1d.tga
_1n.tga		_1n.tga
a4		a4
a4soln		a4soln
bitmap_image.hpp		bitmap_image.hpp
bunny_1k.obj		bunny_1k.obj
bunny_200.obj		bunny_200.obj
cube.obj		cube.obj
main.cpp		main.cpp
main.o		main.o
p.txt		p.txt
scene01_plane.txt		scene01_plane.txt
scene02_cube.txt		scene02_cube.txt
scene03_sphere.txt		scene03_sphere.txt
scene04_axes.txt		scene04_axes.txt
scene05_bunny_200.txt		scene05_bunny_200.txt
scene06_bunny_1k.txt		scene06_bunny_1k.txt
scene07_shine.txt		scene07_shine.txt
scene08_c.txt		scene08_c.txt
scene09_s.txt		scene09_s.txt
scene10_cube_perspect.txt		scene10_cube_perspect.txt
scene11_cube_ortho.txt		scene11_cube_ortho.txt
scene12_pipe.txt		scene12_pipe.txt
scene13_pipe_top.txt		scene13_pipe_top.txt
test_cases.sh		test_cases.sh
texture.cpp		texture.cpp
texture.hpp		texture.hpp
texture.o		texture.o

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README.txt
==========================================================================================
Author:		Andrew Moran	|
Date:		11/15/2012	|
6.837 Computer Graphics		|
Assignment 4			|
=================================
__________________________________________________________________________________________
Compiling Instructions
==========================================================================================
	When I completed the assignment, I managed to run Linux through my Macbook Pro laptop with a Virtual Machine called VirtualBox.  I also tested on the campus Athena computer to make sure that it worked correctly.  Here are instructions
	1.	Unzip submission on Stellar and extract all files to designated directory
	2.	In terminal, cd to directory containing "assn4" folder
	3.	command make
	4.	if images not already in folder:
		command sh test_cases.sh
		This should reproduce the images generated from this assignment ranging from names _1-13 corresponding 			to scene number.
	5.	"assn4" folder contains all necessary files including updated 
		files, classes, subclasses, etc.

__________________________________________________________________________________________
Collaboration
==========================================================================================
	I had no further assitance other than the help I received from Professor/TAs at office hours.

__________________________________________________________________________________________
References
==========================================================================================
	⁃	6.837 Lecture Notes (Very Helpful)
        -	http://www.cplusplus.com/reference/
	- 	(Ray Tracing Primitives) http://www.cl.cam.ac.uk/teaching/1999/AGraphHCI/SMAG/node2.html

__________________________________________________________________________________________
Problems
==========================================================================================
	Currently, my code is functioning properly.  It took some time debugging, but should be a good solution.  My main problem was normalizing the normals.  For whatever class whether it was an object, shape, camera, material, etc I kept forgeting to normalize directions/normals which threw me off for a bit.  However, finally found my problem.

__________________________________________________________________________________________
Extra Credit
==========================================================================================
	Here are some added features to the assignment:
	•	Depth output - added optional argument that allows you to view depth map of image (look at _1d.tga)
	•	Normals output - added optional argument that allows you to view normals map of image (look at _1n.tga)
	•	Orthogonal camera - different from Perspective Camera.  View looks slightly different.  (lookat at OrthoCamera.cpp & 11.tga)
	•	Pipe Ray Tracing Primitive - I originally was implemenmting a ray-cylinder intersection, than realized with added constraints and code, I could make a more interesting pipe.  Took a while and research, but finally got it done. (look at Pipe.cpp & 12.tga & 13.tga) 

__________________________________________________________________________________________
Comments
==========================================================================================
	I felt very guided on this assignment by the lecture notes.  By following the slides and implementing the correst formulas and constraints, I saw progress fast.  The only thing that threw me off was normalizign normals.  I am still confused when I should/should not normalize vectors (for both normals and directions).  This resulted in very small discepancies in lightibng on my pictures.  After realizing that I didn't normalize (or normalized when I shouldn't have), I was able to fix my mistakes.  At first, I was stuck trying top implement textures in both Trinagle.cpp and Material.cpp.  This made me realize that my overall normal and textCoord was a weighted sum of the barycentric coordinates I calculated.  Also, you can access texCoord from hit.texCoord.  At this point, I had everything figured out except one small mishap.  When a texture was valid, I forgot to set the Kd for the ambient light to the new texCoord in addition to calculating the diffuse lighting.  As a result, I was able to finish on time and accomplish some extra credit.  After research, I was able to implement a pipe.  Images show the proper lighting of object when viewed at different angles.  It was complicated with many formulas and 4 possible values for t (could intersect inside,outside, top, bottom of open cylinder).  As a result, I got far and enjoyed this assignement.