# Crabgrass free 3D model

=> gemini://thinkmoult.com/radiance.gmi Back to Radiance models

# Crabgrass



=> https://thinkmoult.com/pic/crabgrass.png Preview of crabgrass

Crabgrass is usually seen as a weed in gardens, and looks a bit like a crab.

This model is provided as a circular patch, which is relatively sparse. It is assumed that this patch will be instanced many times with different translated locations, rotations, and scales in order to build up the illusion of a field of vegetation.

## Materials

The colours have been calibrated with Macbethcal to a patch of grass in Australia, but the specularity and roughness values are guessed. Therefore the green of the grass should be within the ballpark of believable colours, but it should not be treated as a proper representation of a specific species.

## Usage

This Radiance model follows the [Radiance Filesystem Hierarchy Standard]. As such, please run `make lib` to build the Radiance mesh file. Once done, you can use this in your scene by:


=> https://thinkmoult.com/proposed-radiance-filesystem-hierarchy-standard.html Radiance Filesystem Hierarchy Standard

```
!xform lib/crabgrass/obj/model.rad
```

In order to preserve memory in the occasion of including many instances of this model, an `.oct` octree is also provided, and so you can instance it in your scene as follows:

```
void instance model
1 lib/crabgrass/obj/model.oct
0
0
```

## Authors

This model was originally created by Marco Pavanello and Joseph Dowling in their [free Blender grass pack] licensed under GPL.


=> https://3d-wolf.com/products/grass.html free Blender grass pack

This model was modified by [Dion Moult] in order to create circular patches, follow the RFHS requirements such as naming and model scale, and add Radiance material definitions.


=> https://thinkmoult.com Dion Moult

The original content does not specify which version of GPL it was licensed for, and this creates some confusion, especially as GPLv3 is much more specific about compatibility. Therefore this model is licensed under the Creative Commons Attribution 4.0 license (CC-BY 4.0).


## Free 3D model download

=> gemini://thinkmoult.com/models/crabgrass.tar.gz Download packaged crabgrass.tar.gz

## Comments

If you have any comments, please send them to dion@thinkmoult.com

## License

This work is licensed under a [Creative Commons Attribution-ShareAlike 4.0 International License], unless explicitly mentioned in the asset LICENSE file.

=> http://creativecommons.org/licenses/by-sa/4.0/ Creative Commons Attribution-ShareAlike 4.0 International License