Projects tagged "3d"
Hopefully something here will catch your eye.
Table of Contents
3D Packing June 2017
Tightly pack 3D meshes into as small of a volume as possible.
Formlabs recently announced the Fuse 1, a 3D printer that works via Selective Laser Sintering. This technique uses a nylon powder which conveniently supports the structures as they are printed. No scaffolding or supports are needed, so we can print as many objects as we can pack into the volume.
This begs the question - how many 3DBenchy boats can the Fuse 1 print in a single batch? As soon as the printer was announced, I immediately gravitated toward this algorithmic challenge.
With naive bin packing, 82 boats can be packed into the printer volume. But with some more advanced packing algorithms, 113 boats can fit - a 37.8% improvement!
Ribbon Diagrams February 2017
Parse PDB files and render ribbon diagrams of proteins.
Ribbon diagrams are 3D schematic representations of protein structure.
You've probably happened upon these before. I always thought they looked very complex and never figured I'd know how to create such a diagram myself. After creating FauxGL, however, I was in search of interesting 3D visualizations and decided to research these interesting diagrams.
Roughly, proteins are chains of amino acids that are pieced together while reading genetic code. As a protein is formed, these chains will fold in various ways, forming helixes, strands, and coils. A ribbon diagram depicts the 3D structure of the protein as well as these common secondary structures.
The Protein Data Bank is an online database of over 130,000 PDB files. These files encode all of the information needed to produce a ribbon diagram. With this software, you can simply type
rcsb XXXX where
XXXX is the alphanumeric PDB code and a PNG will be generated in a few seconds.
FauxGL January 2017
3D software rendering in pure Go. No OpenGL, no C extensions, no nothin'.
It's like OpenGL, but it's not. It's FauxGL.
It doesn't use your graphics card, only your CPU. So it's slow and unsuitable for realtime rendering. But it's still pretty fast. It works the same way OpenGL works - rasterization.
I mostly wrote this for fun and for learning, but I've already found it useful in other projects.
- STL, OBJ, PLY, 3DS file formats
- triangle rasterization
- vertex and fragment "shaders"
- view volume clipping, face culling
- alpha blending
- depth biasing
- wireframe rendering
- built-in shapes (plane, sphere, cube, cylinder, cone)
- anti-aliasing (via supersampling)
- parallel processing
Mesh Simplification May 2016
Simple command line tool for simplifying meshes in STL format.
This is a straight-forward implementation of Surface Simplification Using Quadric Error Metrics, SIGGRAPH 97, written in Go. Some problematic meshes don't simplify very well, but overall it works nicely. Watch the animation - the mesh is repeatedly simplified, starting with 86632 triangles and ending with just 64 triangles. The bunny remains recognizable for an impressive duration.
Line Art January 2016
Rendering engine that produces 2D vector graphics (think SVGs) depicting 3D scenes.
Unlike OpenGL, where the output of the rendering pipeline is a rastered image, the output of
ln is a set of 2D vector paths. It supports texturing, CSG, and more! I created this so I could plot 3D drawings with my pen plotter, which naturally requires vector input.
Path Tracer January 2015
CPU-only, unidirectional path tracing engine written in Go.
This was the first thing that I wrote using Go and I've been loving it ever since! The inspiration for this project came from Evan Wallace's WebGL Path Tracing.
- Supports OBJ and STL file formats
- Supports textures, bump maps and normal maps
- Supports raymarching of signed distance fields
- Supports volume rendering from image slices
- Supports various material properties
- Supports configurable depth of field
- Supports iterative rendering
- Supports adaptive sampling and firefly reduction
- Uses k-d trees to accelerate ray intersection tests
- Uses all CPU cores in parallel
- 100% pure Go with no dependencies besides the standard library
GPS September 2014
Real-time 3D visualization of actual GPS satellite locations.
This code interfaces with a USB GPS receiver and produces a 3D visualization of GPS satellite positions for all of the satellites that are currently in view.
HiRISE August 2014
Fly through real Martian landscapes using data released by HiRISE.
This code converts HiRISE DTMs from their PDS format to a 3D mesh in STL format with an accompanying normal map texture for high-resolution lighting. The visualizer was written using
pg, my Python OpenGL library.