WORK IN PROGRESS BUG REPORTS APPRECIATED
Have you ever wanted to generate fractals ? Recursive geometry ? Complex self-similar structures ? Or simple 3D models for voxel-like game ?
ProcGen is a C++ library aimed to be used for procedural generation. It works as rewritting machine which iteratively transforms user-defined structures to other structures. This is allowed by defining custom structures like in C-like language and defining rules which act like procedures, transforming the given input structure to new structures.
The generation is thus similar to parametric stochastic OL-systems as it has rules with parameters, which are conditioned. However, both rule body and condition are defined in imperative manner, with C-like statements like if, while.
It works as a blackbox that receives a description of generation, written down in procedural language at the input and outputs generated collection of structures in fancy JSON format.
The library is a part of bachelor thesis at FIT BUT in 2018.
See
- C-like style of code
- L-system & rewritting system based generation
- Run-time structure and rules configuration
- JSON serializing for results of generation
- CMake supported
- Python bindings (TODO)
How does this tool and L-systems work
Following code was used to generate the pyramide which can be found in the header of this document.
using vec3 = struct {// define vector of 3 floats
float x;
float y;
float z;
};
using cube = struct {// define cube (position + side of cube)
vec3 position;
float sz;
};
// the one and only rule
using tst = rule cube {
return true; // this rule is valid in every step, so simply return true
} {
// the body of rule -> following statements create new symbols which
// replace the current one in next-step string
float newSize = this.sz/2.0;
// Generate three base cubes
appendSymbol(cube(vec3(this.position.x-newSize,this.position.y-newSize,this.position.z-newSize) ,newSize));
appendSymbol(cube(vec3(this.position.x+newSize,this.position.y-newSize,this.position.z-newSize) ,newSize));
appendSymbol(cube(vec3(this.position.x,this.position.y-newSize,this.position.z+newSize) ,newSize));
// Generate one above them
appendSymbol(cube(vec3(this.position.x,this.position.y+newSize,this.position.z) ,newSize));
};
// Global function which works as main() in regular c
int init() {
appendSymbol(cCube(cVec3(0.0,0.0,0.0),50.0));
setMaximumIterations(5);
}- Ing. Tomáš Milet - advisory/supervision
