Mirror+copy = crash

[boludap]

Hi!

I am starting working with a scene with  row houses. It's one base model instanced next to each other and then mirrored, creating two paralel lines of houses. Everytime I tried to render it crashes, and I've isolated the problem to have the modifier "mirror+copy" applied. If I have a lot of houses no problem, if I create two copies, mirror one and then render no problem, it's only when "mirror" with "copy" activated.

Any ideas? It seems such a basic problem that I guess I'm not the first one to experience it, but I couldn't find anything in the forum.

Pau

[romullus]

I don't think it's Corona related problem. Just reset transforms of problematic object and it should be fine.

[boludap]

Hi Romullus, thanks for your answer. Sorry, I don't know what you mean with reset the transforms? (quite of a newbie here) The object is the model of the house, imported from Archicad. I haven't done anything with it yet, just mirroring it. The only render engine crashing is Corona, so I don't know if it's its "fault" but I believe it's a factor. I've started from scratch a couple of times to make sure I didn't do anything else, but that's it.

[romullus]

When you mirroring objects it's basically the same as scaling them to -100% on one axis. It is advisable to reset transforms after such operations. You can do this in Utilities panel Reset xform->Reset selected.

[Ondra]

can you upload me the problematic scene? https://corona-renderer.com/upload/

[boludap]

Hi again! Sorry for not answering, deadline pushing. Romullus, I tried that and didn't work, so I just didn't use copy when mirroring, and I had more individual objects in the scene. It would be nice to know what's wrong so I can do it faster next time, tough. Keymaster, I'm uploading a file with the house model right away. As said, it crashes only if I mirror+copy. It's a model imported from Archicad using the din3D plugin.

[Ondra]

note to self: Gustavslund-Coronatestscene.max

[Ondra]

ok, I fixed it so it does not crash anymore, but it still produces wrong results. The problem is in the modifier, it produces invalid normals. I tested it with scanline and mental ray and got the same wrong results.

[maru]

I'm not exactly sure what this case looks like but would it be possible to use "symmetry" modifier here?