Displacement map issue, mesh is inflated at render

[jrebuffat]

Hello,

I am new to displacement map and today I wanted to try it out, so i created a model in zbrush, did the uv and all the stuff to get a good displacement map, now inside maya I import my low poly model and add a AiStandarSurface shader to the model then plug a file to the disp mat, switch to catclark and enable auto bump.

And now when I render my mesh, it look fat, so i tweaked a few thing and found out that when I tweak the scale on the displacement Shader it reduce the fatness of the model, but also make the detail drop at the same time, so i ended up with nothing in result…

Here is 2 pictures with the scale at 1 and scale at 0.

Hope we can find a solution for this, it may be completely stupid but I’ve been stuck on this for a few hours now and can’t figure it out even with lots of google searches…

Thanks you !

I have attached a zipped folder if you want to try the geo and map by yourself. 

scale of .5 in the disp atribute

[mspeer]

Hi!

I can't open this rar file.

Make sure to set mid color and Color Space correct.

Color range (-1 to 1 / black) or (0 to 1 / grey)?!

Color Space for file node maybe "RAW"?!

[jrebuffat]

Hello,

Tanks for the answer, yeah i think I am right on the color space of the file node, mine is set to RAW, and my color range is grey.

i have reattached a zip file this time wish contain the mesh and map, it should be good this time.

Thanks you !

[mspeer · Accepted solution]

Hi!

You need to shift your color value by 0.5, cause this is your midpoint.

There are many ways to accomplish this, you may use one of the utility nodes.

[jrebuffat]

Thanks for the clarification, but can you go a bit more in depth about that solution ? I d'ont have the best experience with the hypershade atm, and i would not know how to do it... sorry for my low knowledge about this, it may sound stupid to you.

Thanks a lot for the help !

[jrebuffat]

Hey,

found my issue,

it was from zbrush since the beginning, the thing was :

my midpoint on the multimap export tool was set to 0.5 and arnold need it to be set at 0 to understand the value from black to white correctly, since i don't find the way to adjust my midpoint in the hypershade of maya i directly exported a new map from zbrush with the midpoint at 0 and it worked perfectly well.

thanks for everyone who helped ! hope this can help other ppl.