c# Ray Tracer

Name: Andy Jun Cheng Low
Student Number: 1136438
Username: ANDYJUNCHENG
Email: [email protected]

Completed stages

Stage 1

• Implement vector mathematics
• Fire a ray for each pixel
• Calculate ray-entity intersections
• Output primitives as solid colours

Stage 2

• Diffuse materials
• Shadow rays
• Reflective materials
• Refractive materials
• The Fresnel effect
• Anti-aliasing

Stage 3 - Add-ons

• Option A - Emissive materials

• Option B - Ambient lighting/occlusion

• Option C - OBJ models

• Option D - Glossy materials

• Option E - Custom camera orientation

• Option F - Beer's law

• Option G - Depth of field

• (Glossy Materials) Glossy materials have a reflective component and a diffuse component, we choose a suitable ratio between the two to obtain the desired glossy effect

• (Beer's Law) Calculate the light absorbance of a material, depending on the color obsorbence of the material

• (Depth of field) Shoot a ray through the pixel with a fixed focal length to find the focal point, fire multiple random rays within a circle about the camera determined by the aperture size throught the focal point and obtain an average color

Final scene render

Rendering time 10 minutes and 13 seconds.

With the following command:

dotnet run -- -f tests/final_scene.txt -o output.png --aperture-radius 0.01 --focal-length 0.8

Sample outputs

Sample 1

dotnet run -- -f tests/sample_scene_1.txt -o images/sample_scene_1.png -x 4

Sample 2

dotnet run -- -f tests/sample_scene_2.txt -o images/sample_scene_2.png -x 4

References

• Basic ray tracing - https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-ray-tracing
• Depth of field - https://stackoverflow.com/questions/13532947/references-for-depth-of-field-implementation-in-a-raytracer
• Beer's law - https://www.flipcode.com/archives/Raytracing_Topics_Techniques-Part_3_Refractions_and_Beers_Law.shtml