rPBR

Created by Víctor Fisac [www.victorfisac.com]

rPBR is a 3D model viewer with a physically based rendering (PBR) pipeline written in pure C. The PBR pipeline is written directly using OpenGL and the viewer uses raylib programming library for windows management, inputs and interface drawing.

The viewer uses a High Dynamic Range (HDR) file to load and create an environment: cubemap, prefilter reflection map, irradiance map (global illumination) and brdf map. By the other hand, physically based rendering materials are created to store model textures: albedo, tangent space normals, metallic, roughness, ambient occlusion, emission and parallax.

The header contains a few customizable define values. I set the values that gived me the best results.

#define         WINDOW_WIDTH                1440                // Default screen width during program initialization
#define         WINDOW_HEIGHT               810                 // Default screen height during program initialization
#define         WINDOW_MIN_WIDTH            960                 // Resizable window minimum width
#define         WINDOW_MIN_HEIGHT           540                 // Resizable window minimum height

#define         LIGHT_SPEED                 0.1f                // Light rotation input speed
#define         LIGHT_DISTANCE              3.5f                // Light distance from center of world
#define         LIGHT_HEIGHT                1.0f                // Light height from center of world
#define         LIGHT_RADIUS                0.05f               // Light gizmo drawing radius
#define         LIGHT_OFFSET                0.03f               // Light gizmo drawing radius when mouse is over

#define         CUBEMAP_SIZE                1024                // Cubemap texture size
#define         IRRADIANCE_SIZE             32                  // Irradiance map from cubemap texture size
#define         PREFILTERED_SIZE            256                 // Prefiltered HDR environment map texture size
#define         BRDF_SIZE                   512                 // BRDF LUT texture map size

Note: paths to environment and physically based rendering shaders are defined in pbrcore.h. Check the paths if your program doesn't load shaders properly.

Installation

rPBR requires raylib and raygui submodules. To add them to the repository we need to use the following commands using Git Shell:

* cd src/external/raylib
* git submodule update --init --recursive
* cd ../raygui
* git submodule update --init --recursive

It will install the raylib and raygui submodules. Ensure to be in master branch in each submodule to work with a stable version.

Dependencies

rPBR requires the following C libraries to work:

• raylib.h - raylib framework for window management and inputs.
• raygui.h - raylib user interface drawing functions.
• math.h - Math operations functions [powf()].
• stb_image.h - Image loading [Sean Barret].
• glad.h - OpenGL API [3.3 Core profile].

Screenshots

Credits

• Victor Fisac - Main rPBR developer
• Ramón Santamaria - Support designing and developing rPBR