openEXR Raytracer v. 1.0
author: Alison Cooper (c) 2012
This is a raytracer program that utilizes the openEXR library. On Ubuntu, to install the appropriate libraries please visit this page:
http://packages.ubuntu.com/search?keywords=openexr
The viewer will be necessary to view output.
To compile the program, run the makefile command: make raytra
Information about running the program:
Option 1:
./raytra inputfile.txt output.exr
This takes an input text file (which may reference .obj files) and renders the image described in that file. The output is the .exr file given as the second argument.
./raytra inputfile.txt output.exr n m
n and m are integers.
They have to do with pixel and shadow ray distribution/stratification for making crisper images. n deals with camera rays to a pixel, m deals with shadow rays to an area light. As such, m is only appropriate to be >1 if an area light is contained in the scene file. The program doesn't do anything with m if there is no area light. Increasing n will increase the crispness of the image. Both significantly increase computation time.
Example files to run:
./raytra test3.txt out.exr 3 1
This will take a minute or so to run, and generates a very nice simple image with spheres, some triangles, and mirror reflection.
./raytra creative.txt creative.exr 3 1
This image is all spheres, and draws a man on the moon. It takes longer than the first example to render. To reduce computation time, run it with n = 1. The output image will not be very crisp, though.
./raytra bicycle.txt bicycle.exr
This files uses .obj files and renders a bicycle with mirror reflections and shadows. Giving it 3 1 for n and m will take over 21 minutes to render. There is an exr file of this output image in the repository.
To view output images:
exrdisplay outputfile.exr