Instance Geo on particles

Forums: Instance Geo on particles
Houdini Integrated Plugin

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Re: Instance Geo on particles

Postby juanjgon » Thu Feb 06, 2020 6:19 pm

juanjgon Thu Feb 06, 2020 6:19 pm
In the scenes .zip file in the other post you have the "008-instancingCdColor.hipnc" that is an example using instances, not Octane sphere particles.

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-Juanjo
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Re: Instance Geo on particles

Postby efxlab » Thu Feb 06, 2020 6:50 pm

efxlab Thu Feb 06, 2020 6:50 pm
Strange, I tried the exemple with instance attribute, the instanced sphere render black. Maybe there is a missing setup, no particle color checheck ? or Octane Cd attribute actived ?

I tried too on my exemple too, no way.

DO you think its possible use too the obj Instance?

thx
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Re: Instance Geo on particles

Postby efxlab » Thu Feb 06, 2020 8:35 pm

efxlab Thu Feb 06, 2020 8:35 pm
ok it working, Iam dumass artist, My octane setup was different, I followed exactely your project with the right spm path.
Thanks for your patience

efxlab wrote: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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Re: Instance Geo on particles

Postby efxlab » Thu Feb 06, 2020 9:00 pm

efxlab Thu Feb 06, 2020 9:00 pm
work great now on obj instance. A last thing again, can I use a 4th custom parameters through alpha data ?
I tried to add @alpha data in point with in material a NT_TEX_INSTANCE_COLOR instance with alpha4k_map.ppm file, no success, any idea to use it ?

thanks
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Re: Instance Geo on particles

Postby juanjgon » Mon Feb 10, 2020 3:22 pm

juanjgon Mon Feb 10, 2020 3:22 pm
Hmm, nope, sorry. The alpha can't be handled using this workflow. I'm not sure if this is going to be possible without the proper support for instances point attributes, but I'll check it out.

Thanks,
-Juanjo
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Re: Instance Geo on particles

Postby efxlab » Mon Feb 10, 2020 4:35 pm

efxlab Mon Feb 10, 2020 4:35 pm
ola. ok thanks.

For now I can color instances with Octane gradient or random color. I can use RGB color attribute for drive 3 users attributes (with an OSL separate channel node). Octane is amazing:)
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Re: Instance Geo on particles

Postby juanjgon » Thu Feb 13, 2020 2:01 pm

juanjgon Thu Feb 13, 2020 2:01 pm
efxlab wrote:work great now on obj instance. A last thing again, can I use a 4th custom parameters through alpha data ?
I tried to add @alpha data in point with in material a NT_TEX_INSTANCE_COLOR instance with alpha4k_map.ppm file, no success, any idea to use it ?

thanks


The next Octane 2020.1 plugin build will support the @alpha float point attribute inside the instances packed RGBA values ;)

Thanks,
-Juanjo
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Re: Instance Geo on particles

Postby efxlab » Thu Feb 13, 2020 5:26 pm

efxlab Thu Feb 13, 2020 5:26 pm
amazing Juanjo,
I see in the snapshot that the right alpha name is @alpha and not @Alpha, I was not sure about the syntax, great that its come soon in houdini.
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