Real-Time High-Quality Rendering - Reflective Shadow Maps

By Luis Ángel  (임 영민) - All rights reserved (c) 2019

www.youngmin.com.mx

Functionality

We have implemented Reflective Shadow Maps (RSM), together with Percentage-Closer Soft Shadows (PCSS) and Screen- Space Ambient Occlusion (SSAO) for added realism and details. Our approach works mostly with blurred textures and diffuse 3D objects shaded with the Blinn-Phong Reflectance Model. We have also resorted to Deferred Rendering to achieve interactive rates when RSM and SSAO are enabled, which are, by definition, very expensive tasks in terms of GPU resources. Finally, with regards to random sampling, we are using Poisson Disks which provide a good even distribution of 2D points without the artifacts that usually appear when employing pure uniformly distributed numbers in both PCSS and the importance driven sampling in RSM's indirect lighting.

This OpenGL 4.1 project creates a GLFW window and renders on it a scene with geometric and textured 3D object models. To interact with the application click and drag to rotate the scene, press L to rotate the light source, press C to rotate the camera, press O to enable/disable SSAO, and zoom in/out using the mouse scroll button.

All of the fonts, shaders, 3D object models, textures, and Poisson disks (2D points) must be located in a Resources directory, and you should provide its path in the Configuration.h header file.

Requirements

The code has been tested on macOS 10.13 (High Sierra), and requires the following libraries to be installed under /usr/local/lib (with their respective include directories in /usr/local/include):

• GLFW https://www.glfw.org/download.html
• LibPNG https://sourceforge.net/projects/libpng/files/
• FreeType https://sourceforge.net/projects/freetype/files/
• Armadillo http://arma.sourceforge.net/download.html

The above libraries may be built using ./configure - make - sudo make install, except GLFW which requires CMake to be installed (https://cmake.org/download/).

You may create a project using the CLion (https://www.jetbrains.com/cpp/), which requires XCode to be installed in your macOS system.

If you create the project on XCode, make sure to add the OpenGL framework and the libraries GLFW, FreeType, and Armadillo to your target in the project configuration settings.