Displacement issue

[chris_jette]

I am using displacement to display the material on the exterior of a building rather than modeling the material for time reasons. I am getting ready to do final renders but there is a weird glitch that comes up. I don't know how to get rid of it or if you can get rid of it. I have the exterior part of the walls as a component and applied the material to the component like usual. When I start the render, it works fine except for that glitch. It looks like it comes from the window holes as when I remove the window holes, it disappears. If I just fill in the window holes and just leave the lines there, the glitch still appears.

I haven't really used displacement that much, but this is something I haven't seen before.

The image I have attached has just the exterior plane of the wall in a separate sketchup file just for ease of trouble shooting. I am using Sketchup Pro 2021 and Vray 5 on Widows 10.

Thanks for the help.

[nikoleta.garkova]

Hi chris_jette

What if you try to subdivide the geometry a bit more, does the issue persist? Are you using 2D Displacement or Normal Displacement? Keep in mind that Normal Displacement takes the original surface geometry and subdivides its triangles into smaller sub-triangles which are then displaced. Give it a try and divide your geometry in, for example, separate panels: http://ftp.chaosgroup.com/support/sc...0_13-32-15.mp4 Let me know if that works for you.

Alternatively, do forward a sample project file so we can have a look. You can reach us through our online contact form, make sure to mention this thread in the email. Thanks!

To read more about displacement, please visit: https://docs.chaosgroup.com/display/...P/Displacement

[chris_jette]

Hello Nikoleta,

Thanks for the help. I am using normal displacement. I did try subdividing the geometry into smaller part, and that seems to have solved the issue! During my trouble shooting, I did try subdividing it by drawing horizontal lines around the window areas, which didn't work, but drawing the line vertically seems to work.

Thanks!

[konstantin_chaos]

Hi chris_jette,

The Normal V-Ray displacement subdivides the mesh at render time and then moves the vertexes based on your displacement map.
In that regard it is highly dependent on the mesh topology.
That is why adding the divisions helped - you basically removed the n-sided face above the windows.
I'd personally add both vertical and horizontal lines for good measure.

Another option that I'd recommend is switching to 2d displacement.
It is geometry independent and might be faster in your scene.

And lastly, you should also consider not using displacement at all but rather stick to bump or normal mapping.
If you don't see the object silhouette being curved/deformed by the displacement I believe that a good normal map can give you the same results.

Regards,
Konstantin