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SideFX Labs Tech Art Challenge 2022 » Best Houdini Utility Entries

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PaQ WaK
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Hello,

Here's a circle packing tool, made to recursively finding circle on a surface, from the largest to the smallest one.
Can be use to partition city parcels, or build abstract graphics.

The testing surface is remeshed by the tool for the distance testing/sampling. As a result the process can take a bit on time on models. The approach is not perfectly accurate, but it might be a starting point to a more mathematical version.



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Technical Discussion » Houdini edge selection to ring !!

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PaQ WaK
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Select one edge, hold A, middle click the second edge.
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Technical Discussion » Poly Bevel issue with extruded object.

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PaQ WaK
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Hard to tell without having a look to the real geometry.

As you don't provide an explicit edge group, did you use the exclusion option (ignore flat edge) + angle (around 30 probably).
You might want to compute the normals after the bevel (vertex - by face area for the weighting) to get good result with ngones.
(even tho it's not your initial problem here).
Edited by PaQ WaK - Oct. 1, 2022 16:36:48
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Houdini Lounge » Count all UV islands ?

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PaQ WaK
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Hello,

You can first create an 'island' prim attribute to assign a island number by connectivity. You can use the "connectivity" operator, set on primitive, and tick "use UV Connectivity".

To count the number of island, you can use a vex detail wrangler with :
i@maxisland = nuniqueval(0, 'prim', 'island');
Edited by PaQ WaK - March 27, 2022 12:18:22
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Houdini Lounge » XPU tests (with sample scene)

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PaQ WaK
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Rhino Vex - TR3970X - CPU

Windows

H19.0.383 : 05:53
H19.0.435 : 01.52

(Linux H19 : 01:38)
Edited by PaQ WaK - Nov. 11, 2021 10:37:12
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Houdini Lounge » XPU tests (with sample scene)

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PaQ WaK
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I have updated the numbers, using the last version from GCharb, testing H18.5 and 19 on both OS.
Edited by PaQ WaK - Nov. 6, 2021 12:12:13
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Houdini Lounge » XPU tests (with sample scene)

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PaQ WaK
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Rhino Vex - TR3970X - CPU

Linux H18.5 : 02:27
Linux H19 : 01:38

Windows H18.5 : 02:47
Windows H19 : 05:53


Edit : On windows I do however have a bunch of compile error msg, and for some reason the bg color is back.
There is definitively something odd in H19 Windows.
Edited by PaQ WaK - Nov. 6, 2021 12:26:17
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Houdini Lounge » XPU tests (with sample scene)

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PaQ WaK
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@GCharb, indeed the speed gain is insane Oo

Rhino Scene

Windows 10:

CPU : 12:08
XPU : 03:43

Linux (POP OS 21.04)

CPU : 04:59
XPU : 03:16

TR3970X / RTX2060 super
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Houdini Lounge » XPU tests (with sample scene)

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PaQ WaK
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Pyro Scene:

CPU : 4:23
XPU : 0:26

Rhino Scene:

CPU : 12:08
XPU : 03:43

TR3970X / RTX2060 super
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Houdini Lounge » Grammar Check Your Screens?

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PaQ WaK
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!
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Technical Discussion » Exporting FBX Frame Range As Separate FBX Models?

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PaQ WaK
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Hello,

https://www.sidefx.com/forum/topic/54398/ [www.sidefx.com]
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Houdini Lounge » Houdini Engine For Clarisse

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PaQ WaK
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You mean USD and Solaris bring Clarisse in Houdini ? The time it takes me to setup/shade a barrel using USD I have a complete environment done in Clarisse.

Thing is that I really don't want to turn this thread into Houdini>Clarisse. I'm using both, with today version.

USD dont replace Clarisse, it's an other layer of annoying stuffs to deal with.
Edited by PaQ WaK - July 3, 2021 13:22:45
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Houdini Lounge » Houdini Engine For Clarisse

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PaQ WaK
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Hello,
From now on I have decided to bump this thread once a year :O)
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Houdini Lounge » Mesh Thickness in VEX with intersec(), improving my code

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PaQ WaK
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Hello,
There is a new calculate_thickness in the SideFxLabs (release 18.5.624)
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Houdini Lounge » Audio Driven Pyro Problem

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PaQ WaK
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Hello, never seen a way to grab an attribute like that in a parameter channel (you probably should use a prim or point expression to lookup the value).

I had to try myself, so here's a little setup using chops to drive the sim time scale from the envelope (magnitude signal) of an audio file.


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Houdini Lounge » Selecting outer edge ring loops procedurally

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PaQ WaK
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Hello,

There is an 'ignore flat edge' option in the exclusions section of the edge bevel.
For a 10 sections tube, you need to set an angle slightly higher than 360/10.

Depending how you build your geo, there is probably a way to tag those edges upstream in the process, making the process more reliable than based on an angle. (.hip attached)

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Edited by PaQ WaK - March 24, 2021 20:17:19
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Houdini Lounge » Procedural Modeling: Trouble with Ray SOP & Creep SOP and

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PaQ WaK
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Beside, as your tree already comes with usable uv's (after a bit of geo cleaning), you might as well use a simple xyz dist to warp a "2d" curves network around your trunk.
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Houdini Lounge » Procedural Modeling: Trouble with Ray SOP & Creep SOP and

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PaQ WaK
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Hello,

I'm not really familiar to this "creep" operator (seems kinda old), but according to the doc, the surface need to be a Nurbs geo.

The geometry of the Source op is crept along the path of the Path op. The path type can be any primitive, but should define a surface (e.g. NURBS surface, primitive tube, etc.)

So instead of the polyloft, you might want to copy nurbs circle, and use the skin operator to build a nurbs surface.
From a quick test, it seems to work here about the vines projection .
Edited by PaQ WaK - March 16, 2021 03:22:50
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Houdini Indie and Apprentice » fused curve to polygon?

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PaQ WaK
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Not very sexy way, but it works
Edited by PaQ WaK - Jan. 14, 2021 15:05:05
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Houdini Indie and Apprentice » fused curve to polygon?

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PaQ WaK
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Salut Olivier,

You first need to find a way to close one side with a curve (the red curve in this example), maybe you will need a bit of vex, like starting from the first valence 1 point, and find the closest next valence 1 point, and build a polyline with those two points. But maybe you can find an easier way to isolate this 2 points, I don`t know the setup.

After that, fuse everything, polypath to create a single ordered curve, and the end sop to close it as polygon.
Edited by PaQ WaK - Jan. 14, 2021 14:53:12
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