Web Screen-Space methods for fluid rendering

 

[1] https://www.babylonjs.com/

Houdini Trying to use textures

 

[1] How to use textures on Houdini

http://wordpress.discretization.de/houdini/home/advanced-2/textures/

[2] Repository of textures with normals

https://opengameart.org/content/50-free-textures-4-normalmaps

[3] Textures for Blender

https://polyhaven.com/textures/brick/outdoor/wall

[4] HDRs (Environment Ilumination patterns) https://polyhaven.com/hdris

NVIDIA tools

 

 

[1] https://github.com/NVIDIA/warp

3D Design software

 

 

[1] Tools ESP https://all3dp.com/es/1/mejores-programas-diseno-3d-gratis-modelado-3d

 

3D grid savig methods using struct.pack

 

Python version for ints

def save2grid(filename,volume,dimx,dimy,dimz):

  with open(filename, "wb") as file:
    for i in range(dimx):
      for j in range(dimy):
        for k in range(dimz):
          f = (volume[i][j][k]*255).astype(np.uint8) #numpy.uint8
          #print(type(f))
          b = struct.pack('B', f)  #was f
          file.write(b)
          
def save2gridfast(filename,volume,dimx,dimy,dimz):
  flat=volume.reshape((dimx*dimy*dimz))
  flat=(flat*255).astype(np.uint8)
  with open(filename, "wb") as file:
       b = struct.pack('%sB' % len(flat), *flat)
       file.write(b) 

Python version for floats

def save2grid(filename,volume,dimx,dimy,dimz):

  with open(filename, "wb") as file:
    for i in range(dimx):
      for j in range(dimy):
        for k in range(dimz):
          f = volume[i][j][k] #[3.14, 2.7, 0.0, -1.0, 1.1]
          b = struct.pack('f', f)
          file.write(b)
def save2grid2(filename,volume,dimx,dimy,dimz):
  flat=volume.reshape((dimx*dimy*dimz))
  with open(filename, "wb") as file:
    for i in range(dimx*dimy*dimz):
       f = flat[i]
       b = struct.pack('f', f)
       file.write(b)
def save2grid3(filename,volume,dimx,dimy,dimz):
  flat=volume.reshape((dimx*dimy*dimz))
  with open(filename, "wb") as file:
       b = struct.pack('%sf' % len(flat), *flat)
       #b = struct.pack('f', f)
       file.write(b)

Houdini 18 - Changing temp directory

 

Setting temp directory

$ locate houdini.env

/home/cloud/houdini18.0/houdini.env

#
# Houdini Environment Settings
#
# The contents of this file are read into the environment
# at startup.  They will override any existing entries in
# the environment.
#
# The syntax is one entry per line as follows:
#    VAR = VALUE
#
# Values may be quoted
#    VAR = "VALUE"
#
# Values may be empty
#    VAR =  
#

# Example:
#
# HOUDINI_NO_SPLASH = 1


HOUDINI_TEMP_DIR = /home/cloud/.houdinitmp

 

 

DualSPHysics Simulation pipeline

 

First Step: Create geometry

[1] FreeCAD https://www.freecadweb.org/downloads.php

[2] Plugin DesignSPHysics https://github.com/DualSPHysics/DesignSPHysics

Second Step: Compile/Install DualSPHysics

[1] How to https://melhorum.blogspot.com/2019/07/dualsphysics.html

Third Step: Run smulation CPU or GPU

[1] ...

Fourth Step: Polygonize/Render

[1] ...

 

 

Houdini 18: Fundamentals

 

PDG & examples (~2020)

[1] https://www.sidefx.com/learn/pipeline-pdg/

Materials

[1] https://www.youtube.com/watch?v=TzDAxvPFh1E

Hair Shading

[1] https://www.youtube.com/watch?v=aO1r5yv3QT8

Objects

[1] Rock https://www.youtube.com/watch?v=gINvU11LHB0

Flip

[0] Tips to improve https://blendermarket.com/posts/flip-fluids-10-tips-to-improve-your-blender-workflow

[1] https://vimeo.com/182074285

[2] https://vimeo.com/189254805

[3] Splash https://vimeo.com/209763376

[4] Collider https://vimeo.com/252645795

 

Sources

[1] pool https://www.sidefx.com/forum/topic/27689/?page=1#post-130379

Houdini Resources

Models online
[1] Fluid, Physics models https://hdbp.io/browse?page=3

[2] Complete dops examples with Houdini files to download

https://www.tokeru.com/cgwiki/index.php?title=HoudiniDops

Jetson Nano Resources

 

[1] NVIDIA https://developer.nvidia.com/open-source

Volume of Fluid Related

[1] Introduction Adaptive Mesh Refinement (AMR)
https://materials.prace-ri.eu/441/5/AMRIntroHNDSCi15.pdf
https://materials.prace-ri.eu/441/

Rendering

[1] Physically Based Rendering https://pbrt.org/index.html
[2] Scenes https://pbrt.org/scenes-v3.html
[3] Guide https://pbrt.org/users-guide.html

SPH Code Resource

[1] C++ SPH https://github.com/aartiukh/sph-sdk
      use

    $git clone --recursive

SPGrid Resources

Code http://pages.cs.wisc.edu/~sifakis/project_pages/SPGrid.html

Compatibility for Linux https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/X86-Built-in-Functions.html
Intel instructions https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_pext_u64&expand=4330

Render obj wavefront file to png/jpeg

C++
[1] Vtk, read obj https://vtk.org/Wiki/VTK/Examples/Cxx/IO/ReadOBJ

$cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Python bases
[1] https://github.com/pclausen/obj2png
[2] https://castle-engine.io/view3dscene.php
     $view3dscene my_model.wrl --screenshot 0 output.png


Tools
[1] pvpython screenshot https://www.paraview.org/Wiki/ParaView/Python/Screenshot
[2] pvpython scripts https://www.paraview.org/Wiki/ParaView_and_Batch


Others
[1] Paraview animation https://www.tacc.utexas.edu/documents/10165/1147324/02+Creating+Animations+with+Paraview.pdf