How do you control the power of noise?

[Micha]

Hi,

how do you control the power of the bump on an "Octane Noise" texture?

Micha

[face_off]

Use Contrast - or plug the Noise into a Multiply and control the power by the second value in the Multiply.

Paul

[Micha]

I tried to get a stronger look of the bump effect. From Vray I know to set higher values than 1. So for example if I have a scene with unit mm than I can set the bump to 5 mm. The Octane Multiply is limited to 1.

The Contrast option give me a wrong look, the noise look is changed to something like a water level effect.

Could you change the multiply to unlimited count or add a power option to the noise ?

Micha

[face_off]

You cannot set the effect of a bump texture > 1. 1 is the overall power limit of a bump map in Octane.

Paul

[Micha]

Paul, please look here, at the standalone >1 seems to be possible:
viewtopic.php?f=23&t=51358&p=255474#p255474

[face_off]

In Octane Standalone you can go outside the slider range. However I've never found the render result to be acceptable doing this. For example, amplifying the bump power from 1 to 2 using this technique does not give a quality result. IMO, the Octane bump code was written to go to "1" - and it works perfectly for that range. Anything over that is a poor result IMO. You can export from the Rhino plugin to Octane Standalone to experiment with this yourself.

Paul

[Micha]

Only I know Vray for Rhino as reference and it works perfect. If I'm working in mm units and render a tree bark, than an bump strange of 5 looks fine. It would be the same quality like working in cm units and 0.5 bump multiplier. So, not only the multiplier 5 and 0.5 affect the visible effect, it's a question of scene units and scene size. Another example: a bird view over a large landscape with grass. Here the bump multiplier could be 5 for cm and 50 for mm. I think you should open the multiplier for artistic free use.

I will play with the standalone, but I think, the artist should decide what is to much and not a render software limit.

[formatio]

I think that eyeballing is the proper measure - even in vray you have to see how it looks even if you know that 5 means 5 mm - it can look nice or it can look s##t - that's the beauty of it.

In octane - noise has no power slider , but turbulence has - I usually set power slider to 0,01 or sth cuz it's very strong effect.

Regards.
Mac

[Micha]

A power slider for the noise could be great. I like simple workflows and adding a multiplier is cumbersome.

Back to the bump - Paul, looks like there is an Octane core bug. I tested high bump values at the standalone and see what you mean.
viewtopic.php?f=23&t=51358&p=255520#p255520