My displacement problem

[sampakinpa]

Displ_map.jpg (42.58 KiB) Viewed 4999 times

export setting from zBrush. tif 16 bit worked best foer me.

disp_hypershade.jpg (20.8 KiB) Viewed 4999 times

[prodviz]

Looks great, cheers.

However, there's a very small negative offset, so I wouldn't expect many issues.

[linvanchene]

sampakinpa,

Thank you so much for sharing!

It helps me a lot to understand why I run into problems with other displacement maps.

The fiber mesh eyebrows and eye lashes look amazing as well!

[sampakinpa]

Thanks for the compliments.

However, there's a very small negative offset, so I wouldn't expect many issues.

Why is it?

The fiber mesh eyebrows and eye lashes look amazing as well!

Hair, eyebrows and lashes are Maya hair rendered with Octane Hair.

[prodviz]

I don't know why, but it appears that the offset with negative setting are causing issues with the geoemtry.
Your offset is of a very small value, so I guess this is why you're not having any issues.

[sampakinpa]

My displacement issues was solved when I started to work with 16 bit displacement maps from zBrush instead of 32 bit.

[prodviz]

Cool, good to know.

For me, the 16 bit version was a little better than 32 bit file.
I was working with a displacement which needed a larger negative value, which still caused geometry issues.

[gordonrobb]

The issue seems like the shift uses a different calculation to the displacement. So if you have a large negative value it invariably tears bits of geometry.

[franchus]

This is fixed using a ClampTexture node between the texture and the displacement node. The explanation of this is: Octane assumes gets the 32 bit value of an image, therefore there might be higher than 1 and lower than 0 values. The Clamp node corrects the interpretation issues.