Ray Tracing

Offline rendering application by ray tracing.

Features

• Spatial data structure (k-d tree)
• Photon mapping
• Procedural texture

Requirements

C++14 or higher. Tested on MSVC v141, no tested on other comilper yet.

• hlsl++ Vector, Matrix library provided a HLSL like syntax.
• libpng Library to handle .PNG file.
• png++ C++ wrapper for libpng library.

Screenshots (work in progress)

Reflection

Refraction & Translucent shadow

Shading

Phong shading model

Blinn-Phong shading model

Texture

Procedural Texture

A procedural texture compute the color while sampling instead of using stored data.

Checkerboard 2D

The checkerboard 2D procedural texture is pretty straightforward. If the sample point fall within the bottom-left or upper-right region it return the main color, otherwise it return the secondary color.

Checkerboard 2D texture on the plane

Perlin noise

Perlin noise is a type of gradient noise developed by Ken Perlin in 1983[1]. This program use a improved version of Perlin noise[2]. The Java implementation written by Ken Perlin himself can be found here.

Perlin noise on the plane

Anti-aliasing

Multisample anti-aliasing with 4 rays per pixel. After tried out multiple sampling pattern, I found 4-Rooks pattern (Rotated grid supersampling) produced the best result in visual.

No anti-aliasing.

With MSAA4x anti-aliasing.

Side by side comparison.

Tone mapping

There are multiple ways to convert the HDR image into LDR space. However the ACES film tone mapping is the most widely accepted and used tone mapping algorithm.

None

Reinhard

Ward’s

ACES Filmic

Open Shading Language

Perlin Noise

Beer’s Law

Author

Jietong Chen