A playground to test my patience.

model by Sousinho

model by Mats de Wind

model by futaba@blender, environment map downloaded from Poly Haven

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Features

Common Vulkan utilities to save my sanity: abstraction classes, validation layer, debug draw,etc.

Dear ImGui and RenderDoc integration

Loading gLTF scenes and basic scene management

• With a Blender addon to make my workflow easier
• Automatic hot reload when asset files change

A CPU shader simulator that helps myself prototype and debug GLSL shaders. It was first created to help develop the sky atmosphere. See example usage in Vincent.cpp.

A variety of rendering paths that can be modified/extended into more variants:

• Simple unlit forward
• PBR deferred with many post-processing options
  • emissive and translucent materials
  • environment maps
  • HDR, tone mapping, gamma correction, exposure compensation
• Multi-threaded CPU path tracing with optional SIMD acceleration using Intel ISPC
  • basic optimizations (BVH, direct light rays, Russian Roulette, correlated multi-jittered sampling within each pixel, cosine-weighted importance sampling)
  • SIMD-specific optimizations that were part of my CMU-15418 final project, see pathtracer-standalone branch
  • diffuse, mirror and glass materials
  • image-based lighting
  • depth of field
• Render to file using the path tracer
• RTX pipeline using the VK_KHR_ray_tracing_pipeline extension, even though it now just draws a single triangle

Physically-based sky atmosphere for both deferred rendering path and path tracer

• It's an implementation of Unreal's sky atmosphere

(OpenGL legacy feature, not integrated yet) Procedural grass generation and animation. See grass-sim branch.

(OpenGL legacy feature, now deleted) shadow mapping for point and directional lights

It used to run on both PC and Mac, but now it's probably broken on Mac.

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(The above water tower model and its textures are from www.animatedheaven.weebly.com)

Usage

Run

./ellyn

WASD to move the camera, E/Q to move up/down. LMB drag to rotate camera. ESC to quit.

When pathtracer is set as the active renderer, camera control is disabled, but instead some pathtracer-specific controls become effective. Look for PathtracerController in the scene hierarchy for details.

Render to file

Something like:

./asz -w 200 -h 150 -o output.png

Configuration

See config/global.ini for properties that get loaded on program start. It gets loaded once and stays effective for the duration of the program.

There's also config/pathtracer.ini that gets loaded when the path tracer initializes. It automatically hot reloads, so I use it for tweaking path tracer settings.

By the way, I named the CMake targets after my OCs (original characters)

This is Ellyn:

And this is Asz (short for Aszelea):

There is also Vin (short for Vincent), but I still need to make them a portrait.