[CIS565 2015F] GLSL Ray Marching
University of Pennsylvania, CIS 565: GPU Programming and Architecture, Project 5
- Sally Kong
- Tested on: Google Chrome 46, Macbook Air 2014, 1.4 GHz Intel Core i5, ntel HD Graphics 5000 1536 MB (Personal)
Live on Shadertoy
Acknowledgements
This Shadertoy uses material from the following resources:
- {McGuire}
Morgan McGuire, Williams College.
Numerical Methods for Ray Tracing Implicitly Defined Surfaces (2014).
PDF
- You may credit and use code from this reference.
- {iq-prim} Iñigo Quílez. Raymarching Primitives (2013). Shadertoy
- {iq-terr}
Iñigo Quílez.
Terrain Raymarching (2007).
Article
- You may credit and use code from this reference.
Features
- Two ray marching methods (comparative analysis required)
- Naive ray marching (fixed step size) {McGuire 4}
- Sphere tracing (step size varies based on signed distance field) {McGuire 6}
- 3 different distance estimators {McGuire 7}
- With normal computation {McGuire 8}
- Lambert shading
- Soft shadowing
- Union operator {McGuire 11.1}
- Transformation operator {McGuire 11.5}
- Debug views
- Distance to surface for each pixel
- Number of ray march iterations used for each pixel
- Height-mapped terrain rendering
Images
####Distance Debug Image
####Normal Debug Image
####Sphere Tracing Step Count Debug Image
![](img/sphere_step.png "Step Count Debug Image"")
####Naive Tracing Step Count Debug Image
![](img/naive_step.png "Step Count Debug Image"")
####Terrain
####Soft Shadow
