DispalcementMod

[fraggle]

Hello,
I trying to get a nice result for an embossed or engraves logo on a metal plate, but all my test return a weird result. decreasing the edge lenght below 1 never render (at 0.5) for example
I red carefully the help file:
http://docs.chaosgroup.com/display/V...isplacementMod
and I really wonder how this smooth result has been achieve:
http://docs.chaosgroup.com/download/...2226000&api=v2


Thanks for your advice.

[vlado]

What's the resolution of your displacement map?

Best regards,
Vlado

[fraggle]

1253px x 2696 px at 118 Px/cm
the bitmap is a PNG file.
The size of displacement in the geomety is 1cm².

Increasing the resolution x 5, give the same result.

[vlado]

Does it get better if you turn down the filter blur for the bitmap?

Best regards,
Vlado

[fraggle]

With a blur at 0.02 and a box division of 500x500 subdiv.
Still not acceptable.

Sorry 200x200 (maximum box subdiv)

[vlado]

Then no idea; best to post your scene.

Best regards,
Vlado

[fraggle]

Test_Displacementmod.zip
Here is the file.
thanks

[fraggle]

Hello,
who can give me some tips to get it working without modeling it.

Thanks

[vlado]

You need to use a better displacement map; if you look at it at 1:1 resolution, you'll see that the map itself is blurry and jagged. When I said you need a higher resolution map, I didn't mean just to re-scale it...

Best regards,
Vlado

[fraggle]

Sure, here is the result with a map at 2500 DPI (800 Mo bitmap size for just a little tiny displacement!).
Yet, more on the ugly side than the nice one!

Increasing to 5000DPI makes the map size bigger than 3Gb, so I don't thing that the quality of the map is the solution of the problem, but you are the boss, not me.

[vlado]

I think we are talking different languages You need to draw/paint the displacement map from scratch at a higher resolution. It doesn't matter what's the DPI at all...

Best regards,
Vlado

[fraggle]

thanks,
the vector file is imported into photoshop, so I can choose the resolution when I import it. So far I tried with 1200/2500 and 5000 DPI.
So what's "Resolution" you are talking about?
If I paint on a white photoshop canvas at 2500 DPI, it will be exactly the same than importing a vector file at 2500 DPI, except that it is must more precise when imported than if I draw it from scratch.
Unless I'm lacking some important numeric image based knowledge, I don't see the point of making it from scratch.

[Raven]

Hi Fraggle

DPI means nothing until something is physically printed, it just tells a printer how small the pixels are in relation to the real world inch. ie 300 pixels in each inch printed etc.
Your image size is fine it is the quality that is not good enough.
I have attached an image with yours on top, and what it should look like on the bottom. see image quality.jpg

I've uploaded reworked scenes for you one with 3D Displace and another with 2D Displace.
For such sharp edges with 3D displacement your edge length needs to be really small, meaning longer render time.
It will probably work better using 2D(landscape), but then your mapping needs to be correct as you see in the example the tiling.

Hope these help.

[fraggle]

Thanks you for your time and advice,
I export to PNG from illustrator instead of using the open file (rasterized) in Photoshop, and that gave me a better result for sure.
Still, I'm confused.
How do you get a good quality bitmap when opening a vector file inside photoshop to prepare a displacement map? Or is it simply not possible and we do have to export from illustrator (but the export quality is limited to 2000%), so there is still some line visible in the displacement.

Thanks

[Raven]

When I do vectors I normally copy and paste it as a smart object in photoshop.
So create a new image that is the pixel size you need, then paste it in, keep it as a smart object and you can scale it up to whatever size you need.