pedohorse/geoconverter

Geo Converter

This is a training project

But that does not mean it's not working

converts geo/bgeo geometry formats into some random other formats

Usage

Input file can be piped in, like

cat file.geo | geoconverter -t obj file_out.obj

Or specified as a file, like

geoconverter file_in.bgeo file_out.obj

(if -t is not provided - assumed output format is obj)

Note on bgeo.sc, bgeo.gz

Formats bgeo.sc, bgeo.gz are simple bgeos, but additionally compressed with c-blosc and gzip correspondingly.

To convert them with this tool you need to first pipe the bgeo.sc file through a blosc decompressing tool into geoconverter

Expressions

You can run simple expressions over attributes (just float/vector point attributes for now).

Syntax is somewhat inspired by vex, but it's not vex by any means.
There are no functions for now, and the "language" is just interpreted postfix notation, nothing is truly compiled.
There are also no built-in functions, for now at least.

for example:

@P = @P + 0.5*@mask*@N will add offset along normal N to P based on mask attribute mask. All attributes MUST exist beforehand in the cache file.
@P=@P + {0,1,0}*@mask will offset P along vertical axis, multiplied by mask attribute
@mask=(@P.z+1)/2 will set mask to be that value evaluated from z component of P

Full command line example would look like this

geoconverter -t bgeo -e "@P = @P + 0.5*@mask*@N" file_in.bgeo file_out.bgeo

supported output formats:

obj
stl
geo
bgeo

supporter input format:

geo
bgeo

Embedding transparently into Houdini

If you want to define your own file format, so you can save it transparently through standard nodes like rop_geometry or file, you can copy the file GEOio.json into your houdini home dir,
for example to ~/houdini19.5/GEOio.json

You might need to adapt the json file, replace geoconverter with full path to geoconverter binary downloaded/built from this repository.
Or, instead, you can add geoconverter binary to PATH env variable so you can call it without full path, then you do not need to change GEOio.json

pedohorse / geoconverter