Instance Geo on particles

[juanjgon]

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.

Thanks,
-Juanjo

[efxlab]

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

[efxlab]

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

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 ?

[efxlab]

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

[juanjgon]

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

[efxlab]

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:)

[juanjgon]

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

[efxlab]

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.

[thanulee]

Bumping up this thread as I am trying to replace a vellum grain sim with custom objects while maintaining also the custom float attributes that I have to colorise the grains.

My sim is around 10m grains and when i try copy to points (even if not visible in viewport and packed prims) H lags a lot and Octane cannot even start.

Is there a solution for this? I was expecting under particles besides "render as spheres" to be able to have a "geometry" option where we point to various sop paths. I tried also octane scatter its not working on grains and in any type of points for that matter unless a polygonal surface.

Please let me know what is possible.

[mirocreative]

Bumping up this thread as I am trying to replace a vellum grain sim with custom objects while maintaining also the custom float attributes that I have to colorise the grains.

My sim is around 10m grains and when i try copy to points (even if not visible in viewport and packed prims) H lags a lot and Octane cannot even start.

Is there a solution for this? I was expecting under particles besides "render as spheres" to be able to have a "geometry" option where we point to various sop paths. I tried also octane scatter its not working on grains and in any type of points for that matter unless a polygonal surface.

Please let me know what is possible.

Did you try using an instance object with the points inside? Works for me 90% of the time.