GIGL - Tiny Global Illumination OpenGL Renderer

DISCLAIMER: this is a work in progress! :-)

Loosely based on the following papers:

1. Keller, "Instant radiosity";
2. Engelhardt et al., "Instant multiple scattering for interactive rendering of heterogeneous participating media";
3. Engelhardt et al., "Approximate bias compensation for rendering scenes with heterogeneous participating media".

Requirements:

1. MSVC2013 redistributables (https://www.microsoft.com/en-us/download/details.aspx?id=40784);
2. graphics drivers with OpenGL 4.4 support.

Notice:

During the first start up, the renderer will procedurally generate volume density textures (64^3 in the world space, and 64x1024^2 precomputed in the camera space). This may take a few seconds. The subsequent program launches will be considerably faster, as the textures will be read from the disk.

Controls:

• Arrow keys move the primary light source;
• Numpad + - control the volume density;
• Numpad * / control the exposure time;
• F toggle the fog;
• G toggle global illumination;
• M toggle the use of ray marching to compute transmittance along shadow rays;
• SPACE reset all settings;
• R reset the accumulation buffer (hold to temporarily disable it);
• C toggle clamping and the primary light source;
• 1 set the VPL count to 10;
• 2 set the VPL count to 50;
• 3 set the VPL count to 150;
• ESC exit the application.