raytracer

Triangle raytraced rendering engine written in Haskell.

current state

plans

Below are un-edited notes from a car ride where I had the idea to make this. Enjoy.

Planned features:

• diffuse shaders
• glossy shaders (with variable roughness)
• emmisive shaders
• refractive shaders (diffraction too?) -?pbr shaders
• point lights
• sun lights
• soft shadows (light is a sphere)
• hard shadows (light is a point)
• environment textures (procedural skies too?)
• textures on polygons
• file format to describe scene setups
• renders to different image formats
• multicore rendering (should be easy to do in haskell)
• depth of field
• lens distortion -?mix in csg objects into polygon scenes? maybe
• use a bvh graph to speed up rendering

far future stuff:

• basic animation and video/image sequence rendering
• 3d textures/volumetrics
• denoising
• subsurface shaders
• shader graph
• blend file reading

file format:

• can specify lights
• can define objects that have meshes and shaders
• objects can be translated, scaled, and rotated
• can define shaders in a special format or maybe in mtl files
• can define meshes by linking .obj files

shaders:

• will be linked to other objects that produce different values. this is to make transition to nodes easier when that happens and to make having textures vs. solid colors easier.
• each type of value in the graph will have its own algebraic data type, and each subtype is a specific version
• eg. brdf type will have diffuse, glossy, refractive, emmisive, constant; color type has texture, constant; vector2 type has texturecoordinate, constant; vector3 has hitpos, constant; and so on
• something like diffuse will have a space for a color type, so you can create a Diffuse $ ConstantCol 255 0 0 to make a solid red shader

state monad will be used for rendering to keep track of scene information and the random seed

progress over time

Time-ordered series of images as the raytracer has new features added.

Date	Image	Meta
12/30/2019		640x480, 1 sample
12/31/2019		640x480, 32 samples
12/31/2019		640x80, 1024 samples