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Volumes General Notes

Volumes General Notes

Select object and make volume with shelf tool BILLOWY SMOKECreates a macro set up with DOP imports and volume caches CREATE DESNSITY NODE     Fluid generator – turns geo into source for fluids     VOLUME SOURCE fetches data from volume source to DOP    SMOKE OBJECT – this node provides the bounding box and fluid container settings         Voxel grid – determines resolution

Pyro Solver – the main solver to create behavior Division method – determines the resolution of the volume in this case. RESIZE CONTAINER – dynamically resizes the container for the fluid sim 
VOLUME VISUALIZATION     In the geo context on the smoke result, IMPORT PYROFIELDS fetches the pyro data    We can use a volume visualization node to dynamically tweak the look of the pyro in viewport 
Create density volume     Fluid source nodeworks to create geo to volume 

  1.     Creates density and  temperature 
  2.      Has a built in noise that can be animated 
  3.      Turbulence and Cell type noise

Velocity volumes –   Can read velocity as an attribute of volume itself Remember to file cache a .vdb for speed and post processing  

  • Dispassion     
  • Disturbance
  • Shredding
  • Turbulence 

Convert to VDB  –  FOR VBV EXPORT
Volumetric boolean by entagma – Create a fog volume from a geo, in this case a head Fill the volume with a Fog Volume Scatter – Scatter points inside the volume    Turn off relax constrains iterations to get a more random field    Use Connect adjacent pieces to generate a structure from the connection on this points     Use ConvertVDB from to generate a VDV mesh    Use the Smooth VDB or Smooth SDF to get a cleaner result.     Use Convert VDB to turn volume back to geo     We can further sudivide the resulting geo, with a Smooth algorithm 

Gradient – vector of the steepest decent in our volume Point into the directions of the surfaceSo we can Normal for our fields Direction and distance – of te normalWith VDB Analysis node we can calculate the gradient for our vector field VDB Advect – allows for advection of the volume with the input of vector information in the second input slot The preview and last frame solver technique Use a SOLVER NODE COPY Vdv analysisVdv advect into solverPlug in vdv to solver Solver inflates volume in the direction of the gradient 

Reshaping the vdb Set up from EntagmaCreate 2 pdf vdb and subtract A from B using the VDB COMBINE – operation set to intersect SDF the SDF will produce better results than subtract operation because it happens after polygon are converted to VDB, subtract only will subtract the numbers resulting in steeping 
Use VDB RESHAPE – We can erode – erode Dialate – incremented sizeOpen or close
Erosion and dilation operation give us control over the way the VDB gets reshaped It can also be done in one operation by setting VDB REHSAPE-  set to\Open = erosion and dilationClose = dilation + erosion 

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