Random texture offset (but cloner in cloner)

[wriedl]

Hi,
I am unable to solve the problem I am currently stuck in:
I found great advice on how to randomize texture offset with the OSL shader method and

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color variance = noise("cell",rndm, Seed);
c = noise("cell",_getinstanceid(),Seed);

This works really great, but I have a cloner within a cloner.
So the instance IDs the low-level cloner generates simply get repeated in each of the high-level cloner instances.

Do you have a hint for me on how I can get unique instance IDs?
Alternatively, I would love to use an instance-independent random number, but cannot find a way to generate one in OSL.

Thanks in advance
Wolfgang

[jobigoud]

For random numbers uncorrelated between neighbor instance ids you can use "Hash" noise instead. Something like this:

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float c = noise("hash", _getinstanceid());

To simulate a seed you can multiply the instance id by a number.

Note that you can also do this without OSL using the "Instance range" and "Random map" nodes.

[RSgraphics]

I hope Otoy makes a solution for people that dont know how to write code

[aoktar]

Another try to do something similar

[wriedl]

Thanks for the input, I appreciate the time you invested!
But still, my problem remains the same. When I have a cloner inside a cloner, the objids and instance IDs remain the same and get cloned.
So unless I am missing something, both of your solutions still produce a dimension of repetition.
In my case, I clone parts of a house vertically and then clone those parts horizontally. Those horizontal parts are then repeating the "random" offsets I created in the first-level vertical dimension.

[aoktar]

What are you using? Render instances?

[jobigoud]

I hope Otoy makes a solution for people that dont know how to write code

As I wrote you can do uncorrelated random numbers without code, using Instance range and Random map on hash noise, in standalone it would look like this:

To randomize UVs with this you can send it into the "Distorted mesh UV" projection.

In my case, I clone parts of a house vertically and then clone those parts horizontally. Those horizontal parts are then repeating the "random" offsets I created in the first-level vertical dimension.

Could you use a 2D grid directly instead of nested 1D arrays ? Then each part will have its own ID.