====== OpenVDB models ======

Intact.Simulation for Grasshopper allows direct simulation of Implicit geometries through VDB models [[https://www.openvdb.org/|OpenVDB]].

{{ :wiki:sns:intactgh:implicit_brake_pedal.png?500 |}} {{ :wiki:sns:intactgh:vdb5.png?500 |}}

Use the Read Volume block to read a VDB volume from a file.
 

{{:wiki:sns:intactgh:ico_io_in.png?direct&100|}}

The VDB volume must be stored as a FloatGrid.
The VDB volume can be used directly as a geometry input to a [[wiki:sns:intactgh:components|Component block]] for simulation.


<WRAP center round box 60%>
📌 See example application [[wiki:sns:intactgh:ex_5|Ex-5: Using VDB implicits for lattice infill]]
</WRAP>

===== Units =====
The easiest way to associate units with an OpenVDB model is to set the [[https://docs.mcneel.com/rhino/7/help/en-us/documentproperties/units.htm|Rhino document units]] to the desired length units.