Comments (3)
Hi @aiotko,
ParaView offers 2 Representation
options for visualizing volumetric data:
Slice
: for velocity you can also select between Magnitude or X/Y/Z components
Volume
: for density you can also useShade
+Show Isosurfaces
Unfortunately, ParaView can't do Q-criterion isosurface like my built-in rendering engine.
Kind regards,
Moritz
from fluidx3d.
Thank you for your explanation, @ProjectPhysX,
I'm just looking for a way to visualize Q-criterion isosurface from VTK output by pyvista or vtk in Python or C++ to have a view like in your engine since it's pretty useful.
Maybe you have an example of how to do it?
from fluidx3d.
ParaView can't do Q-criterion isosurfaces out-of-the-box unfortunately from 3-component vector data. This is how it's implemented in FluidX3D:
- for each of 8 cells in a cube, calculate the Q-value from a 6-point stencil
- calculate vertex positions of up to 5 triangles with marching-cubes
- color triangles based on interpolated velocity/color/temperature
- rasterize triangles
You'd have to copy the part to calculate the Q-value for each cell to your C++ setup and run it on the entire grid on CPU; you can temporarily store Q-values in the lbm.rho
data field. Then export it to .vtk
and let paraview draw the isosurfaces - without coloring though.
from fluidx3d.
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from fluidx3d.