Hi! I'm trying to make a negative displacement. It's a seamless line arrangement that I want it to be carved 1inch in the model. with Vray i'm able to give a value of -1 to the white lines and it carves it on the box. I followed the Arnold tutorial on Displacement, even thought it says we can, i'm not able to give negative value. Either in physical material or in Arnold properties modifier..
Solved! Go to Solution.
Solved by madsd. Go to Solution.
You could try using a Complement shader to invert the bitmap.
>I followed the Arnold tutorial on Displacement, even thought it says we can, i'm not able to give negative value.
Where does it say that?
Thanks for the answer @Lee Griggs unfortunately I already tried to invert the bitmap but it displaces the groove outside instead of carve it inside..
here's what I mean:
Here's What I need: linked autocad file + vraydisp mod set at -1'' (need some tweaking..):
Ps.: and for the negative value I tought I saw, I misread: ''...This is because integer formats do not support negative pixel values, which are used by floating-point displacement maps.''
This is easy to do.
All we need to do first is to understand ranges, especially ranges in positive space and ranges in negative space.
If we pipe a map to a displacement, it will always be going from 0-1 in the range typically, but we want this range to be set to a new range, because we CARVE, this means we got a floor and a roof.
The old roof was 1 and the floor was 0.
We use a range node to convert the space into a useful range when carving and the range we want to output is from -1 to 0, meanin displacement will only go on the negative while leaving the roof untouched.
So source into a converter, and then add a Color Correct node to flip the image around, so that stuff that needs to carve is BLACK, and stuff you dont want to move is WHITE.
See a functional carve here.
Attached a max 2016 file with working carving, and a bitmap, just reload the bitmap back in and it will work.carve-displacement.zip
Thank you, it works! I am very impress with your solution! I will add for the people who use linked dwg geometry, that you have to add a Quadify Mesh modifier to be able to change the heights. 🙂