Ray Tracer Version 2.0

Ray Tracing, Version 2.0

Goal: Ray trace a scene where

the only object in the scene is the generic sphere

the only attribute of the generic sphere is an assigned (emissive) color

the camera is set up

at position (eye_x, eye_y, eye_z),

looking at point (look_at_x, look_at_y, look_at_z), with

the original up-direction for the camera being <0,1,0>.

speed-up has been accomplished by more wisely computing the ray's direction, for each ray.

the scene (including camera information and sphere information) has been described in a file using Scene Description Language

Directory:

Set up a directory for Version 2.0 of your ray tracer, which will contain

Scene Tools:

Suggestion:

Add a class, Scene, which is defined in /classes/cs3114/RayTracing/Projects/scene_tools.h

The header file for the class has been started for you. Just implement the methods, according to the pre- and post-conditions. (Some of the methods you have previously implemented, local to your driver program.) Be sure to test the methods before using them. The methods include:

readScene -- first version is found in /classes/cs3114/RayTracing/Projects/scene_tools.cpp. Feel free to copy and paste, or write your own.

shadePixel

rayTracer

getFirstHit

shader

setup

Ray Tracing Tools:

Suggestion: Add the following classes to ray_tracing_tools:

Class

Data

Methods

Primitive

string prim_type
Color3 color
Matrix_4x4 M

Method

Precondition

Postcondition

Primitive( )

M has been set to Identity Matrix

Ray inverseTransform(Ray the_ray)

the "inverse transform" of the_ray has been returned

Sphere

none

Method

Precondition

Postcondition

bool hit(size_t whichone, Ray itRay, Intersection &inter)

whichone is the index of the primitive (on the list of primitives),
itRay is the inverse transformed ray to be tested

if the object[whichone] has been hit by itRay, then inter contains the record of the intersection and true has been returned; otherwise false has been returned.

HitInfo

GLdouble hit_time
int which_obj
Point generic_hit_point

Method

Precondition

Postcondition

HitInfo( )

hit_time has been initialized to -1.0 and which_obj has been initialized to -1

Intersection

GLdouble num_hits
vector<HitInfo> hit

Method	Precondition	Postcondition
Intersection( )		num_hits has been initialized to 0
set(Intersection source)		the data has been set to the values in source's data fields

Test Scene: /classes/cs3114/RayTracing/Projects/Scenes/red_sphere.scn

- this should produce the same image as version 1.x

Submit all files to directory v2