Instance Geo on particles

Forums: Instance Geo on particles
Houdini Integrated Plugin

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Re: Instance Geo on particles

Postby efxlab » Tue Feb 04, 2020 4:32 pm

efxlab Tue Feb 04, 2020 4:32 pm
ok, so I all instance are unpacked to full geo ? so How you can render a lots instance (a forest for exemple) without impact to the vram and GPU ?
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Re: Instance Geo on particles

Postby juanjgon » Tue Feb 04, 2020 4:36 pm

juanjgon Tue Feb 04, 2020 4:36 pm
You need to use the conventional Houdini instancing workflows, like the Instance OBJ node, or the "instance" point attribute pointing to the object to be instanced. Probably the "instance" attribute is more useful because you can set the instance object to be rendered on each point.

Thanks,
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Re: Instance Geo on particles

Postby efxlab » Tue Feb 04, 2020 4:42 pm

efxlab Tue Feb 04, 2020 4:42 pm
Perfect, thanks.
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Re: Instance Geo on particles

Postby efxlab » Tue Feb 04, 2020 6:17 pm

efxlab Tue Feb 04, 2020 6:17 pm
is it faster to use ORBX for instanced object instead of alembic ? I have maybe more feature using ORBX from houdini ?
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Re: Instance Geo on particles

Postby juanjgon » Tue Feb 04, 2020 6:23 pm

juanjgon Tue Feb 04, 2020 6:23 pm
You can indeed instance a .orbx proxy object. Probably it could be faster because you are going to avoid all the object extraction time, but be aware that the .orbx file should have all the information related to materials and so on inside.

Thanks,
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Re: Instance Geo on particles

Postby efxlab » Tue Feb 04, 2020 6:25 pm

efxlab Tue Feb 04, 2020 6:25 pm
excellent juan, thanks, I need to enjoy and learn deep now :)
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Re: Instance Geo on particles

Postby efxlab » Wed Feb 05, 2020 9:04 pm

efxlab Wed Feb 05, 2020 9:04 pm
is it possible to overrides material's ORBX instance channel ? for exemple make a color variations between the instances ? thanks
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Re: Instance Geo on particles

Postby juanjgon » Wed Feb 05, 2020 9:20 pm

juanjgon Wed Feb 05, 2020 9:20 pm
Although Octane doesn't support the user attributes in the instances yet (currently it supports vertex data for the meshes, curves and particles), the Houdini plugin has a trick to pack the Cd attribute inside an Id that later can be used to get the Cd color using an encoded texture map available in the plugin folder.

You have more details here:
viewtopic.php?f=101&t=73105&p=372155&hilit=instances+cd#p372155

Thanks,
-Juanjo
Last edited by juanjgon on Thu Feb 06, 2020 8:44 am, edited 1 time in total.
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Re: Instance Geo on particles

Postby efxlab » Thu Feb 06, 2020 6:44 am

efxlab Thu Feb 06, 2020 6:44 am
Thanks for the link !
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Re: Instance Geo on particles

Postby efxlab » Thu Feb 06, 2020 6:14 pm

efxlab Thu Feb 06, 2020 6:14 pm
I have just tested on houdini obj Instance, in my instance I created Cd attribute on points scatter/grid, I assigned to instance the Texture/ppm image through a octane network shop. No color render. In your url you dont use a Instance example but a built-in octane sphere scattering. Any recommendation about the setup ?
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