UVをレイアウトする際に、メッシュ間の距離が近いUV島同士を、ある程度固まらせてレイアウトさせたいです。

手元では、以下の方法でトライしてみました。
1.距離が近いもの同士をグループ化して、個別にレイアウトを実行する。
2.「UVLayout」の「Connectivity」を利用して、1のレイアウトを維持したまま全体をレイアウトする。

しかし、この方法では、以下2つの問題が出ます。
・パディング間隔が均一ではない。
・無駄なUV領域が多い。

こちら解決策などありますでしょうか。
よろしくお願いいたします。

I have a question about a texture expression in Houdini that I don't understand.

The image is of a similar object created in 3dsmax and Houdini.
The image is of a circle shape that is created by assigning a noise texture to a flat surface, bending it, and moving it toward the center.
However, the number of polygons is quite different between the two, and Houdini uses Point Color, which results in a huge polygon count.

Therefore, I wanted to express this in Houdini with textures,
I tried to do this in Houdini, but it didn't work.
The second image is a Houdini setting, but the UV should be expanded to be a circle in relation to the bent circle. However, I could not figure out the cause of the parallel projection.
I was wondering if it is possible to use material settings instead of Point Color to express this in the same way as in 3dsmax?

Thanks for taking a look.

I can't find the reason for the error when using inlinecpp custom function. It doesn't work with 19.0 or 19.5.752. How can I solve it? The current version is 19.5.716

I was working with pyro in houdini, converting it to vdb and importing it into ue after exporting. But as you can see in the gif, this volume was moving on its own, it looked like it was moving every time the bounding box got bigger.

After hours of trying to figure out why, I realized that this behavior coincided with the timing of the transform matrix value of intrinsic on a volume created in houdini.

When I forced this value to identity matrix in houdini, I was able to see the same behavior I was seeing in UE5.3.

So far, my theory is that the vdb I exported from houdini doesn’t recognize or ignores the transform matrix in UE5.3 for some reason.



Here is a vdb with the same pyro solver, but the difference between them is the use of
'gas resize fluid dynamic dop'.
The first gif is a bounding box that has not been re-dynamic resized but is fixed in sufficient size, and the second gif is re-dynamic resized.

When I checked these two vdb in the geometry spreadsheet, this issue was occurring at the UE depending on whether the transform attribute of the intrinsic was fixed or not.




Just in case, I forcibly changed the transform attribute into a unit matrix, but it was meaningless, and even if I newly configured the bounding box through the vdb combination, the transform attribute was still moving in flux.


In the end, Houdini needs a way to determine whether pyrovdb cannot be sent to UE using a sparse solver, or how to modify the transform intrinsic to come out as intended.



(This issue is the same question that was posted on UE dev forum)
https://forums.unrealengine.com/t/openvdb-is-moving-around-on-its-own-on-ue5-3-transform-forcibly-recognized-as-a-identity-matrix/1322031?u=dsharp_k [forums.unrealengine.com]

I noticed that even if the first and last keyframes are the same, the extra motion generated by Secondary Motion doesn't necessary loop seamlessly. Is there a way to tell Houdini that the secondary motion needs to form a seamlessly loop (e.g. for game assets)?

whenever i try to click on a workitem to view the results i get this message:

"Traceback (most recent call last):
File "C:\PROGRA~1/SIDEEF~1/HOUDIN~1.743/houdini/python3.9libs\taskgraphtable\taskgraphtable.py", line 408, in _setSelectedItem
index = self.table_model.getItemRow(wi_id)
AttributeError: 'NoneType' object has no attribute 'getItemRow'"

no idea how to troubleshoot this
Any ideas as to why this is happening?

Hi everyone, I'm a rookie in Houdini. I apologize for asking this basic question, but I couldn't find a solution online. I'm trying to use Alembic files in DOPnet, which were animated in Maya. The goal is to control when to activate and when to use the original animation, for that, I added a Point Wrangle: i@active = 0; i@animated = 1;.In DOPnet, there are only three nodes that exist ：RBDPackedObject , Rigid Body Solver , output. RBDPackObject only changes the SOP Path to "/obj/Frac/Pieces"; everything else remains at its default setting. The result I expect is to have animation only on the geometry. However, the final result I get includes both animation and action.Which part did I do wrong? Can anybody point it out?

Hello,

I have this weird issue with mplay. I opened mplay outside of houdini. when ever I play a sequence with the up arrow key then pause (with the up arrow key) instead of just pausing it skips back to some previous frame. For example, if I hit pause (using the hotkey) at frame 50, it will pause but also skip back to frame 12 or some random previous frame. If I just use the UI button I don't have this issue. What is going on? is there some setting?

Thanks

someone that knows about karma, i'm getting renders without alpha channel, I would like to know how to activate it, I think I'm missing something also how can I do to get premultiplied mattes or unpremult in other cases, also my beauty matte doesn't look like " beauty " just the other passes like diffuse combined, gloss combined, etc. I would appreciate the help.

Hello all!

Using vellum fluids to sim some blood (super amazing solver), however, I've noticed that vellum uses surface based collision detection vs. volume based. If I birth fluid on a moving object, after it's initial velocity inheritance, it doesn't seem to inherit the velocity of the collision object. I end up having to create a popwrangle that transfers velocity from the closest surface, which doesn't seem as intuitive as say, flip, where it'll automatically grab the collision object's velocity. Is this the case? Or is there a phantom function somewhere I'm not seeing?

Hey all, I am wondering if anyone has seen any good reference for a stream of water and fire interacting?

I've found some real life footage online but I'm more interested in seeing if there has been any VFX work done in this realm? Maybe the first live action Avatar or something of the like?

Here are some tests that we're working on where a stream of fluid is hitting a stream of fire and emitting steam based off of temperature. This is only a rough outline.

Thanks for your time!

I have 2 machines, one is a ryzen 5950 with 2x 3090 and the other one is a 3790x with a 1060 gpu.
I'm working on a grain sim wihout opencl. But the treadripper is much slower compared to the ryzen. It's only using max 50% of its cpu power. While the ryzen is using 70& of its cpu power. the 32x tr should me faster compared to the ryzen. But how come it's slower?

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Hey all,

Unreal can accept per bone attribs on skel mesh bones.

https://docs.unrealengine.com/5.3/en-US/fbx-attributes-in-unreal-engine/ [docs.unrealengine.com]

Their example (and my desired use case) is around the timecode attribs that are enabled by default. I've be trying to accomplish the same thing but I can't seem to get anything to show up. My tests have been to pass user generated attribs on the points, as detail, or via the fbx_custom_attributes dictionary (so... file/asset level?).

I haven't seen anything online or in forums (so far) speaking to a Houdini use case so I thought I throw a question out to the group at large to see if anyone has had any experience or success with passing data this way.

Let me know, thanks!

Pete

Hello,

Is there anyway to get ANSI escape code colours to to work in both the Python Shell and Houdini Console?

Hidey ho! We just wanted to give you a heads up that Canadian SideFX employees will be celebrating Canadian Thanksgiving on Monday Oct.9th but we'll be back on Tuesday.
The Americans don't do their Thanksgiving 'til November....so weird.

Hi Houdini experts!

The case is that some Python is used to handle the UI in the Parameters Editor.

This is then used to set some parameters that can be read by related VEX code.




Among the parameters are a couple of multiparm folders.

From the Callback Script in the Edit Parameter Interface this works.





In this case the problem is that to populate the right multiparm parms from the Python code, the button with the callback script has to send an argument with the index of the multiparm.


Something like this does not work:

Get Index of Current MultiParm [www.sidefx.com]is a similar topic, but for an unknown reason it did not seem to work for this situation.

How can you get the index (integer) of a parent multiparm folder when using a button with a callback script?




Edit: Never mind. After a good night's sleep I think a lead was found: "kwargs dict would be useful, but it's only provided with callback scripts afaik." (from the linked reference) Yup, that's it.

I have falling debris that I also need to randomly rotate (animate) using VEX in a POP wrangle inside my RBD Bullet Solver.

It seems there are at least 3 steps

1) Determine a random rotation or axis per ptnum
2) Determine a random rotation magnitude per ptnum (increase the angle over time?)
3) Apply this rotation (convert to a quaternion or matrix3 then use to define p@orient or 3@transform ?)

Can any VEXperts help?

I need to know the DPI of the monitor where the current viewport is displayed.

Currently I'm using this snippet to know the DPI of each screen in the system, but I don't know how to tell which one is hosting the viewport.

状況
1. Gather MethodがFeedback loopなforreach blockで、間違えたパラメーターでCookされてジオメトリがCacheされている。
2. Foreach endのReset Cached Passを押しても、再評価されず間違えた結果が残り続ける。
3. ループ内のジオメトリのReset Cached Passを押すと、その部分は再評価されるが、ループ後に元の結果に戻ってしまう。

Foreach BlockのReset Cached Passが上手く動作せず、原因がわからないため何かご存じであればご教授をお願いしたいです。