Vertex Animation Textures ROP 2.1 Released

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Hey Mike!

I'm using Houdini Core here, and followed the steps of the video, and everything seems to work fine, except that my final mesh seems to be inflated. Any idea why?

The issue happens only in VAT 2.1, if I switch to VAT 2.0 the mesh doesn't get inflated.

I will attach an image from the template debug inside Houdini, but the extends to unreal as well. I will also add a simple file to better illustrate the issue.

Cheers!

EDIT: Just got an email from sideFx about this issue. It seems to be a gotcha with RBD bullet solver, the workaround is to add the “rest” “pivot” and “orient” attributes as output on the RBD Bullet Solver.
Edited by martinez3d - Sept. 14, 2020 10:29:18

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vat21_inflatedIssue.hip (3.0 MB)
vat21_inflatedIssue.jpg (60.7 KB)

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I have made a fluid effect in Houdini. When the number of Target prim count is 10000 and the Target texture size is 1024, it is correct to import uE4. But when I import 30000, there will be a broken surface. How to solve? Am I setting the size of the model and map?

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2020915-190512.jpg (152.9 KB)

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Hello
I am having an issue with VAT 2.0 with the fluid sample shader. I have rendered out my fluid and I have got a mesh(fbx), pos.exr and a json file, however when I copy and paste the sample material code from Houdini to unreal I cannot see how to connect the base color, metallic etc, as it doesn't display it. Can someone help?

Thank you.

Varisht
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Hi Mike,

This is awesome! Where could I find the example hip file you showed on the videos?

Thanks,
Kelvin
https://www.linkedin.com/in/kelvincai/ [www.linkedin.com]
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The model of particle formation is wrong
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I'm having trouble with copying and pasting the shader code as well. Several node are not even connected in the graph (most notably Time and all of the texture sample nodes) and it will not compile after making all of the required connections.

This is for a Fluid setup.

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fluid_shader_graph.jpg.png (391.0 KB)
VAT_houdini_ROP.png (142.7 KB)

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hey @rkopinsky,

I believe if you have pasted the code into the material itself, it will show up slightly broken with disconnected wires. However the same code cut/pasted into a material function will show up as expected with nodes fully connected. Then, call the function in the material. Hopefully that works for you.
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Hello,

I've encountered an issue someone brought up in an earlier message, but it wasn't addressed anywhere.

The position map output by the VAT 2.1 node is just… gray. There's no real info in it. Does anyone have any pointers as to why this is?

Thank you!

Attachments:
Rigid.hiplc (3.2 MB)

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peternicolai
hey @rkopinsky,

I believe if you have pasted the code into the material itself, it will show up slightly broken with disconnected wires. However the same code cut/pasted into a material function will show up as expected with nodes fully connected. Then, call the function in the material. Hopefully that works for you.


That 100% worked, thank you very much!

-Bob
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peternicolai
hey @rkopinsky,

I believe if you have pasted the code into the material itself, it will show up slightly broken with disconnected wires. However the same code cut/pasted into a material function will show up as expected with nodes fully connected. Then, call the function in the material. Hopefully that works for you.
Hello peternicolai,
When i call the material function into the material i do not have any parameter to connect to the base color . Is it possible to proceed without a base color?

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Screenshot (25).png (2.9 MB)

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Emitting particles can make mistakes
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UE4 4.25 Emitting particles can make mistakes
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Heya, I'm trying to put the VAT export node inside of my HDA but it doesn't want to cook anymore and I can't figure out why. I put a VAT node in a ropnet, then linked all the params by dragging the node into type properties of the HDA. I assume it has to do with the _component param on the HDA, the python script on there doesn't seem to work? (left of attached img)

When I press render on the VAT it'll look like it's processing like normal but spits out this error on the ‘render_mesh_fbx’:
Error 
FbxExporter::Initialize() failed. Error returned: File not created
Error
Unable to evaluate expression (
Traceback (most recent call last):
File "<stdin>", line 4, in expression
File "C:/PROGRA~1/SIDEEF~1/HOUDIN~1.351/houdini/python2.7libs\toolutils.py", line 1779, in createModuleFromSection
node_type.definition().sections()[section_name].contents())
KeyError: ('vat_utils.py',)
(/obj/boat/NT_RBDsimFromAnim/_project)).

Been stuck on this for a while now, if anyone has some ideas where I can look I'd be grateful!

Attachments:
VertexAnimPythonProblem.png (50.2 KB)

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Hi,everybody,can tell me where to find Vertex Animation Textures ROP 2.1.
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martinez3d
Hey Mike!

I'm using Houdini Core here, and followed the steps of the video, and everything seems to work fine, except that my final mesh seems to be inflated. Any idea why?



EDIT: Just got an email from sideFx about this issue. It seems to be a gotcha with RBD bullet solver, the workaround is to add the “rest” “pivot” and “orient” attributes as output on the RBD Bullet Solver.

You're a lifesaver - thanks you Martinez3D
I had to turn on transfer to geometry too if any others have the problem.
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Hello,
Does any one have any idea why my Houdini textures are not showing up in Unreal even after I do the Vertex Animation Texture export?

Attachments:
Screenshot (25).png (2.9 MB)

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