nishantb15 / Ray-Tracer-Part-2-BVH-and-Mesh

This ray tracer builds from my previous ray tracer (https://github.com/nishantb15/Ray-Tracer---Part-1) which implemented simple shapes, hard shadows, Phong Reflection from a point light source, Multi-Jittered Sampling using n-rooks strategy (Anti-aliasing) and Orthographic and Perspective projection with a moveable camera. This ray tracer adds a Bounding Volume Hierarchy (BVH) which is an accelerated structure, in this case, used to generate an image containing 100,000 spheres which would take days to render without a BVH. More information about the BVH is contained in the BVHTable.pdf file. Support is also included to read a .obj file and import a triangular mesh into the scene. The mesh can then be shaded using per-vertex normals as opposed to per-face (1 normal per face). The pictures generated using BVH are generated using 1 for the number of samples in multi-jittered sampling (essentially no anti-aliasing) and no shadows to save cost. The purpose of this project was to test the efficiency of the BVH in generating an enormous amount of spheres and triangles. Part 3 Can be found at: https://github.com/nishantb15/Ray-Tracer-Part-3-Reflection-Refraction-And-Area-Lights

Part 1: https://github.com/nishantb15/Ray-Tracer---Part-1
Part 3: https://github.com/nishantb15/Ray-Tracer-Part-3-Reflection-Refraction-And-Area-Lights
Part 4: https://github.com/nishantb15/Ray-Tracer-Part-4-Motion-Blur-3D-Texture-Mapping-Volumetric-Rendering

Help from Sources:
https://raytracing.github.io/books/RayTracingInOneWeekend.html#addingasphere/ray-sphereintersection
(For ray, vector, hittable, material, util and ppm color writer)
https://raytracing.github.io/books/RayTracingTheNextWeek.html#boundingvolumehierarchies
(for BVH)
https://www.scratchapixel.com/lessons/3d-basic-rendering/minimal-ray-tracer-rendering-simple-shapes/ray-plane-and-ray-disk-intersection
(For ray plane intersection)