Alexander Vasilev
axess21
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Recent Forum Posts
Houdini Niagara Updates Nov. 4, 2020, 10:58 a.m.
Hi all. I'm trying to use the Houdini Niagara rop to bring an RBD simulation to Unreal and struggling in transferring the correct orientation for the pieces. Did anyone manage to achieve this?
I managed to create the correct orient attribute in Houdini, but how do I feed it to Niagara? What module should use this attribute? I tried “orient mesh to vector” with overriding the quaternion, but it gives the wrong orientation whatever I do.
edit - I found a solution - I had to generate a fake N from orient inside Houdini and export both orient and N, then I used this normal as Look at the direction in “orient mesh to vector” module + orient as quaternion override + N as reference axis vector + 1 override incoming orientation. This feels like an overly complex answer to a simple rotation question.
But I have new questions:
1 - Niagara side - When I try to convert emitter to GPU sim, I get an “invalid type for index in NiagaraEmitterInstance.ush”. Is it even possible to use GPU?
2 - Houdini side - After the first frame I have a weird position offset on each piece. I think it could be some pivot offset, but why it's only starting on frame 2? I mean It looks ok in sim right after RBD but if I delete geometry and instance exported pieces on rbd points, this offset appears.
I managed to create the correct orient attribute in Houdini, but how do I feed it to Niagara? What module should use this attribute? I tried “orient mesh to vector” with overriding the quaternion, but it gives the wrong orientation whatever I do.
edit - I found a solution - I had to generate a fake N from orient inside Houdini and export both orient and N, then I used this normal as Look at the direction in “orient mesh to vector” module + orient as quaternion override + N as reference axis vector + 1 override incoming orientation. This feels like an overly complex answer to a simple rotation question.
But I have new questions:
1 - Niagara side - When I try to convert emitter to GPU sim, I get an “invalid type for index in NiagaraEmitterInstance.ush”. Is it even possible to use GPU?
2 - Houdini side - After the first frame I have a weird position offset on each piece. I think it could be some pivot offset, but why it's only starting on frame 2? I mean It looks ok in sim right after RBD but if I delete geometry and instance exported pieces on rbd points, this offset appears.
Vertex Animation Tool is not working in Houdini 17 Oct. 12, 2018, 2:47 p.m.
Yay! Thank you very much!
Vertex Animation Tool is not working in Houdini 17 Oct. 11, 2018, 4:25 p.m.
Hi Forum,
I am not sure this is the right place to adress this thing, but it looks like the Vertex Animation Tool is not working in Houdini 17. When trying to bake a textere an error in RENDER_POSITION node stops the process:
Python error: Traceback (most recent call last):
File “”, line 5, in
File “D
Program Files/Side Effects Software/Houdini 17.0.352/houdini/python2.7libs\hou.py”, line 19438, in getPixelByUV
return _hou.CopNode_getPixelByUV(*args, **kwargs)
OperationFailed: The attempted operation failed.
Could not open the COP node
Checked this in a fresh setup as well as in the old projects where I baked without any problems. Can someone please check and confirm that this is not only my PC issue?
I am not sure this is the right place to adress this thing, but it looks like the Vertex Animation Tool is not working in Houdini 17. When trying to bake a textere an error in RENDER_POSITION node stops the process:
Python error: Traceback (most recent call last):
File “”, line 5, in
File “D
Program Files/Side Effects Software/Houdini 17.0.352/houdini/python2.7libs\hou.py”, line 19438, in getPixelByUVreturn _hou.CopNode_getPixelByUV(*args, **kwargs)
OperationFailed: The attempted operation failed.
Could not open the COP node
Checked this in a fresh setup as well as in the old projects where I baked without any problems. Can someone please check and confirm that this is not only my PC issue?