displacement triangles appearing on imported geometry

[samuel_bubat]

Hi there,

looks like the very spiky polygons are responsible.
Add a subdivide modifier and decrease the "size" parameter
until the mesh looks regular.
Never tried this with vray displacement but could work.

[s0real]

that's what i was getting at with 'optimize' and that didn't work...
but i s'pose anything's worth a try...

[samuel_bubat]

you could also convert to editable poly, and use the "edit triangulation"
option to change some of the spiky polys by hand.

[blinkimage]

I have also tried the subdivide modifier but with no result. It appears that this may be an ACAD geometry problem - any comments? Anyone have similar issues?

I might try converting to an editable poly, but to be honest, I don't even know what they are!!!!!

[s0real]

did you try file linking the drawing rather than importing it?

any chance of posting a wire?

[e3d]

Hi

I not sure if someone has already mentioned this but it looks like something to do with smoothing groups to me. Change the geometry to an editable mesh, then go into the sub menu. select face or polygon then select your geometry, go down to smoothing groups and click clear all.

That should fettle it!!

Cheers

e3D

[tricky]

Why isn't there a response from the Chaos team to this?

Don't get me wrong, Vray is great, but there are issues with it. I need pointers to get this sorted out! I have tried emailing files to the team before with other questions/crashes, but had no responses.

Any other ideas?

[s0real]

have you tried this with the 1.45 beta?
i think the displacement's been improved from 1.09

[tricky]

s0real - I am in the middle of soooo many jobs at the moment, I don't really want to be changing to a new beta.

What kind of things have been improved?

[s0real]

to many for me to list here.

have you had a look through the updated help manual?
it's got some info on the changes...

http://www.spot3d.com/vray/help/VRayHelp150beta/

it's seems pretty stable though... doesn't seem to crash as much as 1.09 so far.

[tricky]

the thing that put me off is that as soon as it came out, i installed it on one of my machines and opened up one of my files that I'd been working on.

when I clicked render (using the same settings from the previous incarnation of vray where the render looked fine), I got some really odd results. It was like the ambient light had gone grey or something, and some of my uplighters (it was an interior office shot) had hotspots that were 'darker' than the surrounding areas. Anyway, it was all a bit odd, so I returned to the previous install sharpish.

[s0real]

yeah... same here.
i had to wait until i had some spare time at work before i could play about with the settings etc...

lightmap seems pretty useful though as a gi method.
nice and smooth and quick.

[Rolojero]

Hello i also model in autocad mostly the architectural scenes and i have the same problem with vray displacement, i think it has something to do with the way max interprets* the solids of autocad, once is imported looks like made of lots os triangles very ugly achieved...

So maybe we have to start model in max, but for us CAD users is very practical to use the same drawings 2d to make the 3d models.

So i hope you can find a way to vray "reads" in a better way autocad solids and give us autocad users a good solution to this issue.

Greetings!!

[s0real]

??? where did you dig this topic from? it's over a year old!!!

[dbuchhofer]

Tip: use a standard material with faceted checked to get rid of these

this essentially shuts off smoothing for that material completely.

Not the best of fixes, but eh. it gets the job done