negative displacement

[Jiri.Matys]

Hi,

how make negative displacement in max? I have a displacement only on part of an object and need one color of displacement to be on same position as polygons, so it doesnt move. And second color of displacement to be pushed inside of an object. This way normal polygons will be in the same plane as displacement polygons without displacement and displacement itself push surface inside. But when I put negative displacement anywhere (materialor modifier), it doesnt work. And when I use positive values, it not look right. How I can do that?

Thanks.

[Jiri.Matys]

Or how I can make a 32bit texture in photoshop with positive and negative values?

[Neilg]

use mid grey as the value you dont want to move, white out, black in, and use the displace shift modifier set to minus half of whatever the displacement amount is.

[Jiri.Matys]

Its not working. When I use Shift, it moved whole object, not only part with displacement on material.

[Jiri.Matys]

I just put negative value to Amount and its ok. But I dont know why its not working for the first time, I try this in a first place. Never mind.