The final porject of CIS 560 Computer Graphics.
Major features include BDPT, Progressive Rendering, Depth of Field and heuristic BVH acceleration.

Didirectional path tracer	Naive Multiple Importance Sampling

From the obove pictures, bidirectional path tracer performs better in dealing with the influences between adjacent geometries. And also have a better rendering in scenes where lights are obstructed by geometry.

Some test scenes are rendered with acceleration structure-bvh tree. BVH took 3221ms to render a scene with 33K triangles and 1 sample per pixel.

Fig. Heuristic BVH test - building.


Fig. Heuristic BVH test - wahoo & building.

Implemented a new OpenGL shader to render the texture grabed from frame buffer to screen. And update the rendered texture in each render thread.

Screenshot of progressive rendering.

Add lensRadius and focalLength variables to Camera class, sample camera.eye within a disc with radius: lensRadius. Then modify the reference point to focal plane. Cast a newRay by variables above.

long focal length	short focal lenth

small lens radius	medium lens radius	large lens radius

Transmissive and reflective material renderer