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JohnKentFX4 years ago (1 edit)

Hi Bronson,

Thanks for joining us!
I was looking through the Engine / Unity docs and it lists the use of groups as a means of creating multiple game objects from geometry produced by n HDA. We got this to work but in doing so the game objects all have an origin of 0,0,0 but their pivot seems to be in the correct location. Is there a flag / attribute we can use to tell unity that the pivot we see in unity is the location in worldspace location of the gameobject?


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Bronson Zgeb4 years ago

As I understand it not if you use groups as a means of splitting up geometry. You need to set up your geometry as objects in Houdini for Unity to get the information of transformation.

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JohnKentFX4 years ago (1 edit)

In our case that would be hundreds of geometry nodes, I imagine we need a different approach. I was looking into using instances instead but I'm not sure if each instance gets it's own independent transforms or if they show up as a group with a single central transform to all instances. 

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Bronson Zgeb4 years ago (2 edits)

As far as the object level geometry node. You can set up a houdini python script to do this. The SideFX Labs static fracture export will do this for the static frames. You will need to add this to bottom of your SOP network, and adjust the script so it writes it within an editable object level HDA.



You can do instances too. Instances will be more performant than as geometry nodes are straight GameObject conversions. You can use the Copy To Points sop node set to pack, or use the instancer at object level. The former setup is quick and straightforward. The later is more complex but more scalable. EDIT: this method does give each instance it's own transform like you were asking



A third option is to use the Tree or Prefab instancer https://www.sidefx.com/docs/unity/_terrain.html#Terrain_Scatterring. I do not believe this will carry the parent transform though as originally requested.

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JohnKentFX4 years ago

That's so cool! Thanks so much, I'll give this a try shortly. 

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