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Lightweight CPU/GPU path tracer

License: zlib License

C++ 50.96% C 29.30% M 0.03% Cuda 13.64% Makefile 6.07%

tinsel's Introduction

Tinsel

A lightweight CPU/GPU path tracer focusing on speed and simplicity. It offers a single flexible BSDF based on Disney's physically principled BRDF extended to specular transmission / subsurface scattering.

Features

Uni-directional forward path tracer
BSDF based on Disney's BRDF with specular transmission / thin-shell subsurface scattering
HDR environment light probes
Multiple importance sampling of BSDF / probes / area lights
CPU or GPU tracing and shading
Interactive OpenGL progressive mode
Affine and deformable motion blur
Gaussian and box reconstruction filters
Instanced triangle mesh primitives
AABB tree with SAH and various splitting heuristics
Batch mode for animation rendering
Simple scene description .tin format
Windows / macOS / Linux support
Wavefront tracing mode
Non-Local Means noise filtering
Tungsten scene loader

Images

Instancing test (palette courtesy of https://twitter.com/paniq)

Ajax bust in gold (courtesy http://forum.jotero.com)

Ajax bust in plaster (courtesy http://forum.jotero.com)

Spaceship model courtesy of Benedikt Bitterli (https://benedikt-bitterli.me/resources)

Coffee maker model courtesy of Benedikt Bitterli (https://benedikt-bitterli.me/resources/)

Glass Buddha with specular transmission (courtesy Stanford 3D Scanning Respository http://graphics.stanford.edu/data/3Dscanrep/)

Jade Buddha with sub-surface scattering (courtesy Stanford 3D Scanning Respository http://graphics.stanford.edu/data/3Dscanrep/)

Recreation of the Disney Hyperion test scene, https://www.disneyanimation.com/technology/innovations/hyperion.

Recreation of Eric Veach's multiple importance sampling test

Example Scene

The scene description in Tinsel is very simple, and loosely based off Arnold's .ass format, here is an example:

# This is a comment

material gold
{
	color 1.0 0.71 0.29
	roughness 0.2
	metallic 1.0	
}

material plaster
{
	color 0.94 0.94 0.94
	roughness 0.5
	specular 0.1
}

material light
{
	emission 5.0 5.0 5.0
}

primitive
{
	type plane
	plane 0 1 0 0
	material plaster
}

primitive
{
	type sphere
	radius 0.5
	material light

	position 0.0 10.0 0.0
	rotation 0.0 0.0 0.0 1.0
	scale 1.0
}

primitive
{
	type mesh
	mesh octopus.obj
	material gold

	position 0.0 0.0 0.0
	rotation 0.0 0.0 0.0 1.0
	scale 2.0
}

Command Line

Single Image:

tinsel -spp 100 scene.tin output.png

To convert an animation sequence, e.g.: frame_1.tin, frame_2.tin, ... use the following syntax:

tinsel -spp 100 frame_%d.tin

Todo List

Supported Platforms

Tinsel includes makefiles and Visual Studio projects for OSX and Windows respectively. Although not explicitly supported it should be relatively simple to build for Linux.