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Dayflower - Path Tracer v.0.2.1

Dayflower - Path Tracer is a photorealistic realtime renderer written in Java.

The engine primarily uses a rendering technique called Path Tracing, which is in the family of Ray Tracing algorithms. As secondary rendering techniques, Ambient Occlusion, Ray Casting, Ray Marching, Ray Tracing and Wireframe rendering may be used.

This early test implementation of Dayflower uses a library called Aparapi. Aparapi is responsible for decompiling the Java bytecode into OpenCL C99 on the fly. The OpenCL C99 is then compiled into binary code and an attempt to execute it by the current GPU is made. If the GPU fails to execute the binary code, it should still run, but in a Java Thread pool on the CPU.

A new version of Dayflower is available here. That version contains more features and many improvements. It supports both CPU- and GPU-based rendering as well as more light sources, materials, shapes and textures. The new version will be the focus of development moving forward. This version will probably not get any more updates.

alt text

For more images, check out images.


Supported Features

Category Feature
Acceleration Structure Bounding Volume Hierarchy (BVH)
Camera Depth of Field
Camera Field of View
Camera Free Movement
Camera Fisheye Camera Lens
Camera Thin Camera Lens
Light Perez Sun and Sky Model
Light Primitive-based Area Light via an Emission Texture
Material Clear Coat
Material Glass
Material Lambertian
Material Phong
Material Reflection
Normal Mapping Image Texture
Normal Mapping Noise
Rendering Algorithm Ambient Occlusion
Rendering Algorithm Path Tracing
Rendering Algorithm Ray Casting
Rendering Algorithm Ray Marching
Rendering Algorithm Ray Tracing
Rendering Algorithm Wireframe
Shape Plane
Shape Sphere
Shape Terrain
Shape Triangle
Shape Triangle Mesh
Texture Blend
Texture Bullseye
Texture Checkerboard
Texture Constant
Texture Fractional Brownian Motion
Texture Image
Texture Surface Normal
Texture UV
Tone Mapper Filmic Curve ACES Modified
Tone Mapper Reinhard
Tone Mapper Reinhard Modified v.1
Tone Mapper Reinhard Modified v.2

Supported Keyboard Controls

Key Description
ESCAPE Exit or leave the scene if it has been entered like an FPS-game
ENTER Enter the scene like an FPS-game
W Walk forward or move selected Primitive -Z
A Strafe left or move selected Primitive +X
S Walk backward or move selected Primitive +Z
D Strafe right or move selected Primitive -X
Q Increase altitude or move selected Primitive +Y
E Decrease altitude or move selected Primitive -Y
R Toggle selection of shapes
M Toggle the material for the surface instance of the selected shape
X Rotate the selected primitive around the X-axis
Y Rotate the selected primitive around the Y-axis
Z Rotate the selected primitive around the Z-axis

Supported Mouse Controls

Type Description
Drag mouse Drag mouse to look around
Move mouse Move mouse to look around when it has been entered like an FPS-game

Supported Menu Controls

Menu Item Description
File > Save Saves the current image
File > Exit Exit
Camera > Walk Lock Toggle walk lock
Camera > Fisheye Camera Lens Use a Fisheye camera lens
Camera > Thin Camera Lens Use a Thin camera lens
Renderer > Ambient Occlusion Use the Ambient Occlusion renderer to render
Renderer > Path Tracer Use the Path Tracer to render
Renderer > Ray Caster Use the Ray Caster to render
Renderer > Ray Marcher Use the Ray Marcher to render
Renderer > Ray Tracer Use the Ray Tracer to render
Renderer > Surface Normal Use the Surface Normal renderer
Scene > Normal Mapping Toggle Normal Mapping
Scene > Wireframes Toggle Wireframes
Scene > Enter Scene Enter the scene like an FPS-game
Scene > Flat Shading Use Flat Shading for Triangles
Scene > Gouraud Shading Use Gouraud Shading for Triangles
Tone Mapper > Filmic Curve ACES Modified Use the tone mapper Filmic Curve ACES Modified
Tone Mapper > Reinhard Use the tone mapper Reinhard
Tone Mapper > Reinhard Modified v.1 Use the tone mapper Reinhard Modified v.1
Tone Mapper > Reinhard Modified v.2 Use the tone mapper Reinhard Modified v.2

Supported Tab Controls

Control Description
Camera > Field of View Change the Field of View
Camera > Aperture Radius Change the Aperture Radius
Camera > Focal Distance Change the Focal Distance
Camera > Pitch Change the Pitch angle
Camera > Yaw Change the Yaw angle
Sun & Sky > Sun Direction X Change the X-axis of the sun direction
Sun & Sky > Sun Direction Y Change the Y-axis of the sun direction
Sun & Sky > Sun Direction Z Change the Z-axis of the sun direction
Sun & Sky > Turbidity Change the turbidity of the sky
Sun & Sky > Toggle Sun & Sky Toggle the Sun and Sky
Renderer > Maximum Distance Change the maximum distance for Ambient Occlusion
Renderer > Maximum Ray Depth Change the maximum ray depth
Renderer > Amplitude Change the Amplitude of the terrain generation
Renderer > Frequency Change the Frequency of the terrain generation
Renderer > Gain Change the Gain of the terrain generation
Renderer > Lacunarity Change the Lacunarity of the terrain generation
Tone Mapper > Exposure Change the exposure for all Tone Mappers

Getting Started

To clone this repository, build the project and run it, you can type the following in Git Bash. You need Apache Ant though.

git clone https://github.com/macroing/Dayflower-Path-Tracer.git
cd Dayflower-Path-Tracer
ant
cd distribution/org.dayflower.pathtracer
java -Djava.library.path=lib -jar org.dayflower.pathtracer.jar

This project currently only works properly on Windows machines. Aparapi needs to be compiled for other operating systems, in order to use GPU-rendering. CPU-rendering should work on other operating systems, however.


Settings

In the settings.properties file you can change a few settings. The supported settings are the following.

  • canvas.width - The width of the canvas being rendered to.
  • canvas.height - The height of the canvas being rendered to.
  • kernel.width - The width of the kernel being processed.
  • kernel.height - The height of the kernel being processed.
  • scene.compile - If true, scene compilation will be performed whether or not the scene already exists.
  • scene.name - The name of the scene to use.

The following is a list of scene names that can be used.

  • House_Scene
  • Material_Showcase_Scene (Default)
  • Monkey_Scene
  • Terrain_Scene
  • Zealot_Scene

Dependencies


Note

This program hasn't been released yet. So, even though it says it's version 1.0.0 in all Java source code files, it shouldn't be treated as such. When this program reaches version 1.0.0, it will be tagged and available on the "releases" page.