Houdini 16 Extended Ocean - Displacement Baking

   3876   3   2
User Avatar
7 posts
Joined: May 2015

Is it possible to save the displacement of the extended ocean and then apply it onto the mesh in another software package (like Maya + Arnold)?

I can see that displacement is being generated from spectrum and mask inside of the material…
But I'm wondering how it could be extracted and saved as Vector Displacement (EXR).

Kind regards
User Avatar
655 posts
Joined: July 2006
Yes, using the Bake All Displacements to One Layer option on the Export to Texture tab of OceanEvaluate. Note this is not in the gold release, so you'd need to install a daily build to get it. I go through that feature in some detail starting at 1:18:40 in the Ocean masterclass:
https://vimeo.com/204806144 [vimeo.com]
User Avatar
7 posts
Joined: May 2015
Thank you for your reply.
Inside of flattank_fluid_extended I try to export it with 16.0.554 and I get following warning:

Cook error in input: switch_bake_single.
Error rendering child: /obj/flattank_fluid_extended/oceanevaluate1/ropnet1/layers_wedge/shell1

Shell error:

Python error: Traceback (most recent call last):

File “”, line 1, in

File “opdefDriver/wedge?PythonModule”, line 212, in applywedge

File “CPROGRA~1/SIDEEF~1/HOUDIN~1.554/houdini/python2.7libs\houpythonportion.py”, line 1287, in decorator

return func(*args, **kwargs)

File “CPROGRA~1/SIDEEF~1/HOUDIN~1.554/houdini/python2.7libs\hou.py”, line 40802, in render

return _hou.RopNode_render(*args, **kwargs)

OperationFailed: The attempted operation failed.

Error: Cook error in input: switch_bake_single.

Unticked Deform Input Geometry
and ticked UV Attribute

I'll attach HIP file if needed.

User Avatar
28 posts
Joined: Aug. 2013
Yes, using the Bake All Displacements to One Layer option on the Export to Texture tab of OceanEvaluate

Hi @johner,

It seems that when baking maps the ocean evaluate writes out the maps directly from the volumes? So are you not able to bake the displacement to geo with custom UVs (not just from a planar project)?

Do you have any examples of using the ocean tools with already deformed geometry? I'm creating a huge wave and want to apply ocean displacement on top, however my problem is:
- if I create my ocean, then bake out my vector displacement, then bend it into a huge wave, the vector displacement is now in the wrong space so the geo displaced at render time won't match my geo in SOPs (which is obviously an issue when doing spray/mist etc)
- I could bend deform my geo first then add the ocean displacement (using wave instancing to orient them correctly on the huge wave), however ocean evaluate doesn't seem to work correctly when using already deformed geo, I think it expects a flat grid.. Especially if there is an overhang in the geo I get some really strange results (i'm guessing because of the wave it samples the 2D volumes..)

Is there a way I can convert the world space vector displacement from the ocean evaluate into a tangent space displacement? That way (I think) if I deform the geo afterwards it will still be in the correct space..?
  • Quick Links