Maxwell Render | Official public forum

I know this is posted before but I cant locate sorry...
What is the technique to get brick displacement working correctly on corners without ugly artefacts and spaces ?
I have meshed heavily.... Is it a smoothing setting ?
Thanks in advance


how to avoid THIS

URL=http://img26.imageshack.us/my.php?image=dfdfdfdfv.jpg][/URL]

I remember reading about this as well. I think the solution is to make the displacement negative i.e. have the mortar displace inwards rather than the bricks displace outwards. Try altering the displacement offset layer so that the mortar displaces inside the volume of the geometry?

Not a bad idea what Ozzy suggested, i haven't thought about that until now

Here's a old Maxwell material i created, it's a seamless brickwall with displacement that wraps almost quite nicely around corners. See the exampleimages below


Examples




Directlinks to the images
http://img6.imageshack.us/img6/5288/mxmbrickwall1.jpg
http://img26.imageshack.us/img26/1328/mxmbrickwall0.jpg
http://img24.imageshack.us/img24/2371/mxmbrickwall2.jpg
http://img22.imageshack.us/img22/1179/m ... lgrass.jpg

/ Max

Geometry should be smoothed. As this volumes usually have 90º corners it is recomended to fillet the corners and refine the mesh there so the projection of the textures are more perpendicular to the faces than radial.

...ah, yes I seem to remember filleting helps - well done Fernando.

and, as ever, well done Max!

managed to get it working ok with displacement set at 0.2 cm.
Strangely the displacement of the mortar seems to be at least 2 cm but without corner artefacts.
What exactly is offset supposed to have no effect ?

Is your scene to scale? How about the wall object itself. Has it been scaled and is no longer at a scale of 1? In Max you can reset transform and scale to alleviate this.

By the way, don't do negative displacement around sharp corners. If the displaced geometry crosses itself in these "voids" it will mess up the material. I have done this before on a stone texture.

I've heard that this problem is fixed if you set your smoothing angle for the object to less than 90 degrees. I've yet to test this however. If anyone has I'd love to hear your experience with this.

-Brodie

Brian , scene is to scale but something is odd.

This is positive displacement at 0.2 cm with no offset and smoothing < 90
The image i posted above is positive displacement at 2.0 cm with no offset and smoothing < 90.

Anyways its workin fine for this situation

I have a similar problem. The real issue is that I am using Mudbox displacement maps and cage meshes so smoothing the base mesh is not an option (you can't make the displacement relative to another base mesh subdivision or delete the lowest subdivision level like ZBrush).

In my experience, smoothing should be >90º unless you fillet the corners (and you should).

This may be a dumb question, but how do you set the angle of smoothing? I have a rock wall I'm working on, and smoothing is on, but I don't see anywhere in the mxm editor to adjust the angle.

That has to do with your model (surface smoothing), not with your material so it should be done in your modeling app or in studio > object properties.