Windows - Boxes or planes?

[sjlim]

Just wondering what you architectural people use when doing windows.

Do you use just a simple plane (with no thickness) or do you use a very thin box (closer to reality).

thanks.

[natty]

hi
Personally i build everything as it would be in the real world.
as much detail as poss.
and sometimes Vray has trouble with things that dont have a thickness.

hope this helps

Natty

[suurland]

I always use planes.. with boxes as glass everything slows down quite a lot.

/Thomas

[GoncaloP]

I always use planes.. with boxes as glass everything slows down quite a lot.

/Thomas

Which IOR value do you use then?

[natty]

My thoughts excactly..........

[flipside]

I suppose 1.0, no bending of rays

[GoncaloP]

then for reflections you will need a perpendicular/paralel fallof...

[flipside]

aren't reflections independant from the IOR?

[GoncaloP]

aren't reflections independant from the IOR?

No

[flipside]

Do you mean fresnell reflections? Are regular reflections also influenced by IOR setting? If yes, in which way?

thanks

[RErender]

Yes, the fresnel effect is a product of ior , metals for one have "regular reflections" but have what are known as "complex ior" so they have a fresnel effect

Neil Blevins touches on it here http://www.neilblevins.com/cg_educat...l_and_refs.htm

[flipside]

That's a very cool tip you gave here! thanks!

regards,

flipside

[3dform]

I personally do windows last. I just draw a slpine for the area, extrude it, solidify it and then apply my Vray Mtl. Importend is: affect shadows, dopple side off and costum fresnel (the one inside is not useable).

Well that's all, but more realistic would be glass that react on the darkness behind the glass (Yes, that's a realistic behavior).

robert

[yeeha68]

Planes work well but only reflect on one side. You have to be sure your normals are in the right direction. It also is a problem if you move your view from one side to the other.

[caustic angel]

well, i use the standard 3d windows from architectural office, which have 2 planes for the glass, which you can see, if you have to map them in max.

the problem is that 2 planes in big curtain walls with more than 50 windows can increase rendering time too much. you have to set the raytrace depth very high, what is not very effectively.

my problem is that i have to clear up all the windows, which means that i am deleting one face from the glas and flipping the normals.

but sometimes the meshes are, hm, "damaged", they would be rendered black. i think it is a question of the right view. from a higher angle the glas seems to be black but i you look on it directly so there are reflections...

hm, its very interesting thing to fix the problem with glas.


sorry for my english,